ArticlePDF Available

Abstract and Figures

Prebiotics have great potential as agents to improve or maintain a balanced intestinal microflora to enhance health and wellbeing. They are non-digestible (by the host) food ingredients that have a beneficial effect through their selective metabolism in the intestinal tract. Key to this is the specificity of microbial changes.Thanks to the methodological and fundamental research of microbiologists, enormous progress has been made in understanding the gut microbiota. A large number of human intervention studies have been performed that have demonstrated that dietary consumption of certain food products can result in statistically significant changes in the composition of the gut microbiota in line with the prebiotic concept. The concept prebiotics is to enhance the growth of beneficial bacteria in the lower intestine. There is much interest in increasing the numbers and activities of beneficial bacteria (Bifidobacteria) in the large gut, preferably at the expense of more harmfulbacteria. The focus of this review has been to point out the prebiotic effects (bifidogenic effects) of acacia gum and inulin. Some effects attributed to selected prebiotics have been proved by clinical trials, while others have been acquired on the basis of in vitro tests.
Content may be subject to copyright.
148
Journal homepage: www.fia.usv.ro/fiajournal
Journal of Faculty of Food Engineering,
Ştefan cel Mare University of Suceava, Romania
Volume XIV, Issue 2- 2015, pag. 148 - 156
PREBIOTIC EFFECTS OF INULIN AND ACACIA GUM
(REVIEW)
*GjoreNakov1, Darina Georgieva1, Nastia Ivanova1, Stanka Damyanova1, Viktorija Stamatovska2,
Ljupka Necinova2
1Department of Biotechnology and Food Technologies, University of Ruse “Angel Kanchev”, Branch Razgrad,
Aprilsko vastanie Blvd. 47, Razgrad 7200, Bulgaria, gore_nakov@hotmail.com, nastiav2001@yahoo.com
2Faculty of Technology and Technical Science-Veles, UniversitySs.Kliment Ohridski Bitola, R.Macedonia,
stamvikima@gmail.com
*Corresponding author
Received April 26th 2015, accepted June 16th 2015
Abstract: Prebiotics have great potential as agents to improve or maintain a balanced intestinal
microflora to enhance health and wellbeing. They are non-digestible (by the host) food ingredients
that have a beneficial effect through their selective metabolism in the intestinal tract. Key to this is the
specificity of microbial changes.Thanks to the methodological and fundamental research of
microbiologists, enormous progress has been made in understanding the gut microbiota. A large
number of human intervention studies have been performed that have demonstrated that dietary
consumption of certain food products can result in statistically significant changes in the composition
of the gut microbiota in line with the prebiotic concept. The concept prebiotics is to enhance the
growth of beneficial bacteria in the lower intestine. There is much interest in increasing the numbers
and activities of beneficial bacteria (Bifidobacteria) in the large gut, preferably at the expense of more
harmfulbacteria. The focus of this review has been to point out the prebiotic effects (bifidogenic
effects) of acacia gum and inulin. Some effects attributed to selected prebiotics have been proved by
clinical trials, while others have been acquired on the basis of in vitro tests.
Keywords: prebiotics, inulin, acacia gum, prebiotic effects (bifidogenic effects)
1. Introduction
Prebiotics are a category of nutritional
compounds grouped together, not
necessarily by structural similarities, but
by ability to promote the growth of
specific beneficial (probiotic) gut bacteria.
Many dietary fibers, especially soluble
fibers, exhibit some prebiotic activity;
however, non-fiber compounds are not
precluded from being classified as
prebiotics presuming they meet the
requisite functional criteria [1]. Gibson and
Roberfroid (1995) defined prebiotics as ‘‘a
nondigestible food ingredient that
beneficially affects the host by selectively
stimulating the growth and/or activity of
one or a limited number of bacteria in the
colon, and thus improves host health.’’
Given the large number of bacterial strains
present in the gastrointestinal (GI) tract,
some of which are non-cultivable, the
definition was revised to “a selectively
fermented ingredient that allows specific
changes, both in the composition and/or
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
149
activity in the gastrointestinal microflora
that confers benefits upon host well-being
and health” [3]. Roberfroid (2007) updated
this definition in review article on
prebiotics.
Definitions of prebiotics typically have in
common an emphasis on the compound
being non-digestible (and hence subject to
colonic enzymatic activity and
fermentation by colonic bacteria) and able
to selectively stimulate the growth of one
or more desirable or health-enhancing
types of gut bacteria. While definitions of
prebiotics do not emphasize a specific
bacterial group, the number and/or activity
of Bifidobacteria and other lactic acid-
producing bacteria must be increased for
the compound to qualify as a prebiotic.
Either implicitly or explicitly within most
definitions is the concept that the
compound improve the health of the
subject consuming it [1].
Prebiotics are a very specific type of food.
While many of the food ingredients we
consume are digested immediately,
prebiotics are a healthy non-digestible food
ingredient. Futhermore, prebiotics are heat
resistant, which keep them intact during
the baking process and allow them to be
incorporated into every day food choices.
By consuming a non-digestible ingredient,
it allows for growth of bio-cultures by
reaching the intestine unaffected by the
digestion process. A prebiotic effect occurs
when there is an increase in the activity
of healthy bacteria in the human intestine.
The prebiotics stimulate the growth of
healthy bacteria such as bifidobacteria and
lactobacilli in the gut and increase
resistance to invading pathogens. This
effect is induced by consuming functional
foods that contain prebiotics. These foods
induce metabolic activity, leading to health
improvements. Healthy bacteria in the
intestine can combat unwanted bacteria,
providing a number of health benefits [5].
A prebiotic effect has been attributed to
many food components, sometimes
without due consideration to the criteria
required. In particular, many food
oligosaccharides and polysaccharides
(including dietary fibre) have been claimed
to have prebiotic activity, but not all
dietary carbohydrates are prebiotics [3-4].
For a food ingredient to be classified as a
prebiotic it must fulfil [6] the following
criteria:
Neither be hydrolyzed, nor absorbed
in the upper part of the gastrointestinal
tract;
Be selectively fermented by one or a
limited number of potentially beneficial
bacteria commensal to the colon, e.g.
bifidobacteria and lactobacilli, which are
stimulated to grow and/or become
metabolically activated;
Prebiotics must be able to alter the
colonic microflora towards a healthier
composition, for example by increasing
numbers of saccharolytic species while
reducing putrefactive microorganisms.
Inulin, oligofructose or fructo-
oligosaccharide (FOS) are the best studied
prebiotics.To date, all known and
suspected prebiotics are carbohydrate
compounds, primarily oligosaccharides,
known to resist digestion in the human
small intestine and reach the colon where
they are fermented by the gut microflora.
Studies have provided evidence that inulin
and oligofructose (OF), lactulose, and
resistant starch (RS) meet all aspects of the
definition, including the stimulation of
Bifidobacterium, a beneficial bacterial
genus. Other isolated carbohydrates and
carbohydrate-containing foods, including
galactooligosaccharides (GOS),
transgalactooligosaccharides (TOS),
polydextrose, wheat dextrin, acacia gum,
psyllium, banana, whole grain wheat, and
whole grain corn also have prebiotic
effects [7].
Predominance of Bifidobacteria in the
large intestine is essential for the
prevention of many diseases and for
maintaining good health. One main
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
150
strategy is the prebiotic approach – the use
of selective carbohydrate substrates in the
diet for the growth of indigenous
bifidobacteria. To be effective, these
carbohydrates must reach the colon
undigested and unabsorbed in the upper
gastrointestinal tract and be selectively
utilized by the bacteria present there [8].
Inulin and acacia gum are examples of
such carbohydrates.
In this review, we present an overview of
the prebiotic effects (bifidogenic effects)
of inulin and acacia gum.
2. Inulin
Inulin is a non-digestible oligosaccharide
that, for nutritional labelling, is classified
as dietary fibre [3]. Inulin is a
soluble dietary fibre. Inulin and
oligofructose belong to a class of
carbohydrates known as fructans. The
main sources of inulin and oligofructose
that are used in the food industry are
chicory and Jerusalem artichoke. They are
considered as functional food ingredients
since they affect physiological and
biochemical processes in rats and human
beings, resulting in better health and
reduction in the risk of many diseases.
Experimental studies have shown their use
as bifidogenic agents, stimulating the
immune system of the body, decreasing the
levels of pathogenic bacteria in the
intestine, relieving constipation, decreasing
the risk of osteoporosis by increasing
mineral absorption, especially of calcium,
reducing the risk of atherosclerosis by
lowering the synthesis of triglycerides and
fatty acids in the liver and decreasing their
level in serum [8].
Inulin is a generic term that covers all
linear fructans with β (21) bonds, with a
variable degree of polymerization [9]. This
specific type of glycosidic bond gives inu-
lin its unique structural and physiological
properties. Because of the beta
configuration of the bonds between
fructose monomers, inulin-type fructans
resist enzymatic hydrolysis by human
salivary and small intestinal digestive
enzymes specific for alpha-glycosidic
bonds. As a result, inulin-type fructans are
indigestible and are fermented in the colon
[1], [4].
The "bifidogenic efect" can be defined by a
specific stimulation of lactic acid bacteria.
Lactic acid bacteria including Lactobacilli
and Bifidobacteria are thought to be
beneficial for the host as they are
associated with beneficial health effects.
This group of bacteria can protect the host
by inhibiting potential harmful bacteria
(eg. Clostridium, Staphylococcus,…)
through different mechanisms [10].
The bifidogenic effect of inulin and
oligofructose is now well established in
various studies, not only in adult
participants but also in other age groups.
This bifidogenic shift in the composition of
the colonic microbiota is likely the basis
for the impact of these prebiotic
compounds on various parameters of
colonic function. Mainly from animal
and in vitro studies and also from some
human trials, there are indications, for
instance, that inulin-type fructans may
reduce the production of potentially toxic
metabolites and may induce important
immune-mediated effects [9].
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
151
Fig. 1: Prebiotic effect of inulin consumption on the composition of colonic microbiota[11]
Gibson and Wang (1994) confirmed the
prebiotic effects of inulin and oligofructose
in an in vitro study. The fermentability was
compared to a range of reference
carbohydrates in batch culture. Bacterial
growth data showed preferential
fermentation by Bifidobacteria while
populations of Escherichia coli and
Clostridium perfringens were maintained
at relatively low levels [6]. Gibson et al.
(1995) studied the selective stimulation of
bifidobacteria by inulin and oligofructose
in a 45-day study of eight healthy male
human subjects. Volunteers were fed
controlled diets of 15 g/d sucrose for the
first 15 days followed by 15 g/d
oligofructose for a further 15 days. Four
volunteers went on to consume 15 g/d
inulin for the final 15 days of the study [6].
The studies of Gibson et al. (1995) showed
that oligofructose and inulin significantly
modified the in vivo composition of the
microbiota by stimulating the growth of
Bifidobacteria [8].
Results from Kaur and Gupta (2002) have
shown that ingestion of inulin compared to
other sources of carbohydrate like sucrose,
could significantly reduce the count of
pathogenic bacteria such as bacteroids,
fusobacteria and clostridia and increase the
count of positive microorganisms such as
Bifidobacteria [14]. Similar human studies
in adult European, Japanese and North
American populations have been reported
for inulin using different daily doses. It has
been suggested that the beneficial effect of
inulin could be due to the ability of
bifidobacteria to change the colonic
environment by inhibiting detrimental
bacteria via the formation of bacteriocins,
the successful competition for substrates or
adhesion sites on the gut epithelium, and
stimulation of the immune system [8].
In vitro data supporting the selective
stimulation of bacterial growth by inulin
has been generated in numerous studies
that are summarised in Table 1. This has
been carried out in defined pure culture
fermentation and by using a mixed faecal
inocula in both batch and continuous
culture [3].
Inulin is naturally present in many
different foods. Some every day foods,
such as asparagus, leek, onions, banana,
wheat and garlic are sources of inulin.
Higher concentrations exist in herbs.
Dandelion root, elecampane root and
chicory root all have large amounts of
inulin. Chicory root is the most common
source of inulin due to its extremely high
concentration as well as its similarities to
the sugar beet. The methods used for the
extraction of inulin from the chicory root
are comparable to the extraction of sucrose
from the sugar beet. This allows for similar
equipment to be used, making it easier for
chicory root producers to cultivate inulin.
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
152
Table 1.
Studies made to demonstrate the in vitro selectivity of inulin in pure culture, mixed batch culture and
mixed continuous culture fermentation
STUDY OBSERVATIONS REFERENCE
Examining the growth of bifidobacteria
on different types of oligofructose in pure
culture. Eight species tested as well as
species of Clostridium, Bacteroides,
Enterococci and Escherichia coli.
Linear oligofructose had more of a
bifidogenic effect than greater molecular-
mass molecules and branched-chain
varieties. Bifidobacterium species showed a
preference for fructans compared with
glucose.
Gibson & Wang
(1994b)
Species of Bifidobacterium (longum,
breve, pseudocatenulatum, adolescentis)
were tested in pure culture for their
ability of fermenting oligofructose.
B. adolescentis was seen to grow best and
was able to metabolise both short- and long-
chain oligofructose.
Marx
et al.
(2000)
The ability of
Bifidobacterium
and
Lactobacillus to grow on MRS agar
containing oligofructose was investigated.
Seven out of eight bifidobacteria and twelve
out of sixteen lactobacilli were able to grow
on agar containing oligofructose.
Hutkins (2000)
Batch culture using faecal inocula to
study fermentation of inulin,
oligofructose, starch, polydextrose,
fructose and pectin.
Bifidobacteria most increased with
oligofructose and inulin whilst populations
of E. coli and Clostridium were maintained
at relatively low levels.
Wang & Gibson
(1993)
Batch culture using faecal inocula to
study fermentation of oligofructose,
branched fructan, levan, maltodextrin.
Fluorescence in situ hybridisation revealed
that branched fructan had the best prebiotic
effect, followed by oligofructose.
Probert &
Gibson (2002)
Continuous culture fermentation to study
fermentation of oligofructose. Selective culturing showed Bifidobacterium
and, to a lesser extent, Lactobacillius,
preferred oligofructose to inulin and sucrose.
Bacteroides could not grow on oligofructose.
Gibson & Wang
(1994b)
This dietary fibre is used as a prebiotic
agent in functional foods to stimulate the
growth of beneficial intestinal bacteria. It
is soluble in hot water, allowing the inulin
to be easily incorporated into drinks, dairy
products, and baked goods [15].
Because inulin, oligofructose, and FOS are
classified as soluble fibers they can be
used as a means of increasing dietary fiber
or to replace sugars or fats. Depending on
the taste, texture, and other attributes
desired, different mixtures are considered
for inclusion in food products like
confectionery, fruit preparations, milk
desserts, yogurt and fresh cheese, baked
goods, chocolate, ice cream and sauces.
Inulin can also be used for the preparation
of fructose syrups.In these applications
they are considered to be a functional food
ingredient, added to make health claims
and/or persuade the consumer the product
is a healthier choice than one that does not
contain inulin-type prebiotics [8], [16].
2. Acacia gum
Acacia gum (GUM) or gum arabic (Codex
Alimentarius Rome 2000) is a soluble
dietary fibre obtained from the stems and
branches of Acacia senegal and Acacia
seyal. These trees are abundant in the
central Sudan, central Africa and in West
Africa [17]. This product is known under
different names, gum arabic (Codex
Alimentarius Rome 2000) [10]. It is
composed mainly of complex
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
153
polysaccharides (95%) that consist of
highly branched galactan polymers, with
galactose and/or arabinose side chains,
possibly terminated by rhamnose or
glucuronic acid residues [17].
Acacia gum has readily been used in the
food industry for decades as a food
additive. The joint FAO/WHO expert
committee on food additives recognizes
acacia gum as a food additive (INS 414)
that can be used with no specified ADI. In
the USA, Acacia gum enjoys a GRAS
(Generally Recognised As Safe)
classification [18]. In Europe, acacia gum
is also recognized as a food additive (E
414) under the “quantum satisprinciple
[19]. In 2001 the French administration has
officially recognized AG as a dietary
soluble fiber which allows the fiber content
of acacia gum to be taken into account for
the nutritional content labeling of fiber
[10].
More than twenty studies have been
performed since the late 70’s to understand
the relationships between acacia gum and
the colonic microflora. It is widely
recognized that acacia gum induces [10]:
- A bifidogenic effect;
- A specific stimulation of SCFAs
production;
- A high gut tolerance.
While >80% of current production is used
by the food industry for various
applications (emulsification, encapsulation,
coating, gum candies, etc.), GUM is
traditionally consumed by African and
Indian populations to improve digestive
comfort and intestinal transit. In vitro, its
fermentation is slow and supports the
growth of Bifidobacteria. Thus, GUM may
be a bifidogenic soluble dietary fibre that
would not induce uncomfortable intestinal
side effects in the healthy consumer [17].
First studies performed in vitro showed that
among different genus of bacteria from human
faeces, bifidobacteria strains were able to use
acacia gum for their growth [20].
Various studies mention its potential as a
prebiotic agent. Wyatt et al. addressed the
issue in one volunteer by applying 10 g
gum arabic and noted an increase in the
numbers of Bacteroides and
Bifidobacterium [22]. In vitro studies
showed that GUM supported the growth of
pure cultures of bifidobacteria strains and
increased total lactic acid-producing
bacteria counts in continuous cultures of
human faecal microflora. In the stools of
one volunteer, Wyatt et al. measured an
increase in the proportion of bacteria able
to ferment the gum, among which species
of Bacteroides and Bifidobacterium were
found. These preliminary findings
suggested that GUM could be prebiotic
[17].
The bifidogenic properties of acacia gum
were confirmed in a single blind controlled
study performed on 10 healthy volunteers
consuming either acacia gum
(Fibregum™) at the dose of 10 g/d and 15
g/d during 10 days or sucrose as control at
the same dose.
Concentrations of Bifidobacteria,
Lactobacilli and total lactic acid bacteria
groups were significantly increased with
Acacia gum at the dose of 10 g/d compared
to control without affecting neutral groups
as bacteroides. The bifidogenic effect was
even more pronounced (+1 log) in subjects
having low initial bifidobacteria count
(<9.5 log). The effect was also significant
at the dose of 15 g/d [17-18].
Lower dose (6 g/d) of acacia gum was
tested in a randomized double blind
controlled study involving 96 healthy
volunteers. After 1 week of consumption, 6
g/d of acacia gum (Fibregum™) induced a
0.7 log increase of faecal Bifidobacteria
compared to initial value that was at the
limit of statistical significance (p=0.09).
Moreover, the effect of this fiber was
greater compared to FOS that induced a
0.3 log increase.
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
154
These experimental studies allow
concluding that acacia gum has a prebiotic
effect at the dose of 10 g/d and that the
extent of the effect is at least equal to the
effect of FOS [10], [18].
Due to the growing range of supplemented
products, consumers are exposed to
increasing amounts of prebiotics and may
ingest daily doses above the threshold for
induction of side effects. In vitro
fermentation time for acacia gum is
significantly longer than that for FOS and
studies have suggested a more favourable
abdominal side-effect profile. Replacement
of a proportion of FOS by acacia gum may
thus attenuate the side effects of prebiotics
with the additional advantage of a
synergistic effect on the growth of
intestinal bifidobacteria [23].
The prebiotic efficacy of Acacia gum was
also clinically confirmed when consumed
for up to 4 weeks [22]. Daily consumption
of water was taken as the negative control
and that of 10 g inulin as the positive
control. Compared with the negative
control, the number of Bifidobacteria and
Lactobacilli, 4 weeks after consumption
were significantly higher for Acacia gum
(10g): approximately 40-fold and 6-fold
difference in outgrowth. Moreover, at this
dose the numbers of Bifidobacteria and
Lactobacilli were significantly higher for
acacia gum than for inulin: respectively an
approximately 10-fold and 7-fold
difference. (Graph 1) All subjects tolerated
the 4 weeks of consumption of acacia gum
and no significant changes were observed
during the intervention period as compared
to subjects who consumed the negative or
positive control.
Fig. 2.The change in 10-logarithmic numbers of bacteria during 4 weeks of consumption of 10g acacia gum, 10g
inulin or water [10]
Acacia gum was shown to produce a
greater increase in Bifidobacteria and
Lactobacilli than an equal dose of inulin,
and resulted in fewer gastrointestinal side
effects, such as gas and bloating [22]
When used as food additive, acacia gum is
a texturiser, thickener, stabiliser, emulsifier
and coating agent. Such variety of
functions with a single product is unique.
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
155
When used as ingredient for its health
benefits, acacia gum is a dietary fibre with
prebiotic effects.The health benefits of
acacia gum are given by the non digestible
behaviour of the high molecular weight
molecule. Acacia gum is a dietary fibre
(more than 90 % on dry basis) with high
gut tolerance and prebiotic effect. Low
viscosity in water system, low calorific
value (1,8 2 kcal/g) and non-cariogenic
effect explain the wide field of applications
in dietary food and nutraceutical products
[24].
4. Conclusion
Prebiotics are nondigestible food
ingredients that benefit the host by
selectively stimulating the growth or
activity of one or a limited number of
bacteria in the colon. Because of their
positive attributes Bifidobacteria and
Lactobacilli are the most frequent target
organisms. Several researchers believe a
potentially more important factor in
fluencing growth of Bifidobacteria, as well
as other microorganisms, is the initial
presence and counts of specific gut
microorganisms prior to supplementation.
While more research in this area is needed,
it is at least possible that in order to boost
the amounts of a specific Bifidobacteria
species or other bacteria, that species must
initially be present.
Inulin and acacia gum have been
demonstrated to be effective prebiotics.
This has been shown through both invitro
and in vivo assessments in different
laboratories. Experimental studies have
shown their use as bifidogenic agents and
decreasing the levels of pathogenic
bacteria. Because of their recognised
prebiotic properties, principally the
selective stimulation of colonic
bifidobacteria, both inulin and acacia gum
are increasingly used in new food product
developments.
5. References
[1] KELLY G., Inulin-type prebiotics A Review:
Part 1, Alternative Medicine Review, Volume 13,
Number 4, (2008).
[2] GIBSON G.R., ROBERFROID M.B., Dietary
modulation of the human colonic microbiota:
introducing the concept of prebiotics, J. Nutr. 125:
1401-1412, (1995).
[3] GIBSON G.R., PROBERT H.M., LOO J.V.,
RASTALL R.A., ROBERFROID M.B., Dietary
modulation of the human colonic microbiota:
updating the concept of prebiotics. Nutr Res Rev
17: 259-275, (2004).
[4] ROBERFROID M. Prebiotics: the concept
revisited, J. Nutr.,137:830S-837S, (2007)
[5]http://www.prebiotic.ca/prebiotic_fibre.html.
[6] KOLIDA S., TUOHY K., GIBSON G.R.,
Prebiotic effects of inulin and oligofructose,
British Journal of Nutrition, 87, Suppl. 2, S193–
S197, (2002).
[7] SLAVIN J., Fiber and Prebiotics: Mechanisms
and Health Benefits, Nutrients, 5, 1417-1435,
(2013).
[8] KAUR N., GUPTA A. K., Applications of
inulin and oligofructose in health and nutrition, J.
Biosci. 27 703–714, (2002).
[9] MEYER D., Stasse-Wolthuis M., The
bifidogenic effect of inulin and oligofructose and its
consequences for gut health, European Journal of
Clinical Nutrition, 63, 1277–1289, (2009).
[10] Fibregum™, Colloides Naturels International,
www.cniworld.com (2010).
[11] http://www.inspiredbyinulin.com/get-
inspired/healthy-food/inulin-and-weight
management.html.
[12] GIBSON G.R., WANG X., Enrichment of
bifidobacteria from human gut contents by
oligofructose using continuous culture, FEMS
Microbiology Letters, 118, 121–128, (1994).
[13] GIBSON G. R., BEATTY E. R., WANG X.
CUMMINGS J. H., Selective stimulation of
bifidobacteria in the human colon by oligofructose
and inulin, Gastroenterology, 108, 975–982,
(1995).
[14] MIREMADI, F., SHAH, N. P. Applications of
inulin and probiotics in health and nutrition,
International Food Research Journal 19(4): 1337-
1350 (2012).
[15] http://www.prebiotic.ca/inulin.html
Food and Environment Safety - Journal of Faculty of Food Engineering, Ştefan cel Mare University - Suceava
Volume XIV, Issue 2 – 2015
Gjore NAKOV, Darina GEORGIEVA, Nastya IVANOVA, Stanka DAMYANOVA, Viktorija STAMATOVSKA,
Ljupka NECINOVA, Prebiotic Effects of Inulin and Gum Acacia (REVIEW), Food and Environment Safety, Volume XIV,
Issue 2 – 2015, pag. 148 – 156
156
[16] COUSSEMENT P.A. Inulin and oligofructose:
safe intakes and legal status. J Nutr., 129:1412S-
1417S, (1999).
[17] CHERBUT C., MICHEL C., RAISON V.,
KRAVTCHENKO T., SEVERINE M., Acacia gum
is a bifidogenic dietary fibre with high digestive
tolerance in healthy humans, Microbial Ecology in
Health and Disease, 15: 43 -50, (2003).
[18] BARAY S., Chapter 7: Acacia Gum, Section
I:Soluble Fibers, In: Fiber Ingredients: Food
Applications and Health Benefits, (Edited by Cho S.S.,
Samuel P.). CRC Press,Taylor & Francis group,
121-131 (2009).
[19]http://www.food.gov.uk/science/additives/enu
mberlist#.U43Q7_l_uSo.
[20] SALYERS AA. et al. Degradation of
polysaccharides by intestinal bacterial enzymes.
AM. J. Clin. Nutr. 31:S128-130, (1978).
[21] WYATT T.M., BAYLISS C.E., HOLCROFT
J.D., A change in human faecal flora in response to
inclusion of gum arabic in the diet, British Journal
of Nutrition, 55, 261–266, (1986).
[22] CALAME W, WESELER AR, VIEBKE C,
FLYNN C, SIEMENSMA AD. Gum arabic
establishes prebiotic functionality in healthy human
volunteers in a dose-dependent manner, British
Journal of Nutrition, 100, 1269–1275, (2008).
[23] Goetze O., Fruehauf H., Pohl D., Giarre M.,
Rochat F., Ornstein K., MenneD., FRIED
M.,THUMSHIRN M., Effect of a prebiotic mixture
on intestinal comfort and general wellbeing in
health, British Journal of Nutrition, 100, 1077–
1085, (2008).
[24] http://www.treegums.org/products/gum-acacia/
... Among the polysaccharides, Arabic gum (AG), a soluble, non-viscous fiber, which is easily available, cheap, stable, and biocompatible, is one of the most important natural polysaccharides acquired from the Arabic tree with stabilizing, emulsifying, and thickening properties [44][45][46] . AG is a kind of hydrocolloid that is extremely soluble in water and has been employed in several culinary and nonfood applications [47][48][49][50] . The reactive functional groups on its polymeric chain, such as carboxylic acid and hydroxyl, offer dis-tinct chemical modifications that can be applied in a variety of eco-friendly catalytic systems. ...
Article
A catalytic methodology for the effective synthesis of pyrazolopyrazole derivatives using a combination of hydrolyzed Arabic gum-g-polyacrylonitrile/ZnFe2O4 (Hyd AG-g-PAN/ZnFe2O4) catalyst, malononitrile, and aromatic aldehyde, hydrazine hydrate, and ethyl acetoacetate is described. This protocol relies on the use of environment-friendly heterogeneous catalyst based on zinc ferrite magnetic particles in combination with Arabic gum (AG) as the backbone, N, N methylene bisacrylamide (MBA) as a crosslinking agent, ammonium persulfate (APS) as an initiator, and alkaline solution for hydrolyzation. This bio-based catalyst with a soft three-dimensional cross-linked framework contains distinct acidic and basic sites and could be applied as a powerful catalyst for the one-pot synthesis of pyranopyrazoles derivatives. Using an external magnet, the superparamagnetic nanocomposite could be easily separated. Furthermore, the catalyst can well be utilized at least six times in subsequent reaction cycles before losing its activity. FT-IR, EDX, TGA, FESEM, VSM, and XRD methods were used to characterize the produced catalyst. Taking 0.01 g of catalyst at 80°C in a green solvent of water/ethanol, the greatest output of dihydropyrano [2,3-c] pyrazole was 96% in 15 minutes. A simple technique, short reaction time, high yield, and the catalyst's reusability and stability are just a few of the study's advantages.
... Due to low glycemic index, it is good for people with diabetes. pH of acacia fibre is compatible with milk proteins and it is very suitable for dairy applications, having positive effect on rheological properties of food products (Cherbut et al., 2003;Nakov et al., 2015;Sulieman, 2018). Potato fibre has been in focus of scientists related to food technology for several years, but was never used as a cheese sauce component. ...
Article
Full-text available
The objective of this study was the evaluation of different fibres (bamboo, acacia, potato or citrus) addition on texture, rheological and sensory properties of acid casein processed cheese sauces. Fibres used in production of sauces had an impact on the texture, viscosity, viscoelastic and sensory properties. The largest increase in viscosity was observed in products with addition of potato fibre, which have good water holding and adsorption capacity. Processed cheese sauce with the addition of citrus fibre was characterised by the highest values in general, and the increase of this feature in the tested samples was regular. Adhesiveness was the highest in products with 1% addition of every fibre. The lowest values of viscosity single shear, G′ and G″ moduli, among all tested, had sauces with acacia fibre. Moreover, they had the most thin liquid consistency, which was different from preferred one.
Article
Full-text available
Probiotics, prebiotics, and synbiotics are potential mediators to maintaining healthy intestinal flora and have garnered an area of wide research in the past few years. The current study assesses the in vivo effects of probiotic (Lactobacillus plantarum MBTU-HK1), prebiotic (acacia gum) (either singly or in combination as a synbiotic on growth performance), biochemical, hematological, physiological, and immunological effects and their role in the reduction of procarcinogen enzyme activities in male Balb/c mice. The absence of treatment-related toxicity and a normal physiological range of biochemical and hematological parameters ensure their safe consumption. The synbiotic group was found to possess lowered cholesterol levels and enhanced protein and mineral content. The probiotic and synbiotic groups reinforced immunoglobulin levels and had a modulatory effect on phagocytosis. A lymphocyte proliferation pattern suggested the stimulatory effect of synbiotic combination on splenocyte viability and proliferation. Total antioxidant capability in the liver was determined by a 2,2-diphenyl-1-picrylhydrazyl assay and all the treatment groups were found to possess increased scavenging activity. Synbiotic and prebiotic treatment was observed to lead to reduced tumor necrosis factor α (TNF-α) levels. Bacterial procarcinogenic fecal enzyme activities were found to be decreased, proving their role in the prevention of colon cancer incidence. This study proves the potency and safety of oral administration of L. plantarum MBTU-HK1 and acacia gum either individually or in combination.
Article
Full-text available
The health benefits of dietary fiber have long been appreciated. Higher intakes of dietary fiber are linked to less cardiovascular disease and fiber plays a role in gut health, with many effective laxatives actually isolated fiber sources. Higher intakes of fiber are linked to lower body weights. Only polysaccharides were included in dietary fiber originally, but more recent definitions have included oligosaccharides as dietary fiber, not based on their chemical measurement as dietary fiber by the accepted total dietary fiber (TDF) method, but on their physiological effects. Inulin, fructo-oligosaccharides, and other oligosaccharides are included as fiber in food labels in the US. Additionally, oligosaccharides are the best known "prebiotics", "a selectively fermented ingredient that allows specific changes, both in the composition and/or activity in the gastrointestinal microflora that confers benefits upon host well-bring and health." To date, all known and suspected prebiotics are carbohydrate compounds, primarily oligosaccharides, known to resist digestion in the human small intestine and reach the colon where they are fermented by the gut microflora. Studies have provided evidence that inulin and oligofructose (OF), lactulose, and resistant starch (RS) meet all aspects of the definition, including the stimulation of Bifidobacterium, a beneficial bacterial genus. Other isolated carbohydrates and carbohydrate-containing foods, including galactooligosaccharides (GOS), transgalactooligosaccharides (TOS), polydextrose, wheat dextrin, acacia gum, psyllium, banana, whole grain wheat, and whole grain corn also have prebiotic effects.
Article
Full-text available
Oligofructose and inulin are naturally occurring indigestible carbohydrates. In vitro they selectively stimulate the growth of species of Bifidobacterium, a genus of bacteria considered beneficial to health. This study was designed to determine their effects on the large bowel microflora and colonic function in vivo. Eight subjects participated in a 45-day study during which they ate controlled diets. For the middle 15 days, 15 g.day-1 oligofructose was substituted for 15 g.day-1 sucrose. Four of these subjects went on to a further period with 15 g.day-1 inulin. Bowel habit, transit time, stool composition, breath H2 and CH4, and the predominant genera of colonic bacteria were measured. Both oligofructose and inulin significantly increased bifidobacteria from 8.8 to 9.5 log10 g stool-1 and 9.2 to 10.1 log10 g stool-1, respectively, whereas bacteroides, clostridia, and fusobacteria decreased when subjects were fed oligofructose, and gram-positive cocci decreased when subjects were fed inulin. Total bacterial counts were unchanged. Fecal wet and dry matter, nitrogen, and energy excretion increased with both substrates, as did breath H2. Little change in fecal short-chain fatty acids and breath CH4 was observed. A 15-g.day-1 dietary addition of oligofructose or inulin led to Bifidobacterium becoming the numerically predominant genus in feces. Thus, small changes in diet can alter the balance of colonic bacteria towards a potentially healthier microflora.
Article
Interest in consumption of prebiotics and probiotics to improve human gastrointestinal health is increasing. Consumption of beneficial probiotic bacteria combined with oligosaccharides may enhance colonic bacterial composition and improve internal health. The objectives of this article are to review existing literature concerning the effect of synbiotic foods on the composition and activity of the colonic microbiota, and efficiency of functional attributes of synbiotic foods in formulation and development of new dairy products.
Article
The objective of the present study was to determine whether acacia gum (GUM) is a prebiotic fibre and to evaluate its intestinal tolerance in healthy subjects. The effects of increasing doses of GUM were compared to those of sucrose (SUC) on stool output, concentration of the main bacterial populations in stools, and occurrence and severity of intestinal symptoms (flatulence, bloating, abdominal cramps, diarrhoea). Ingestion of GUM 10 and 15 g/day for 10 days increased total lactic acid-producing bacteria and bifidobacteria counts in stools, without affecting total anaerobe and aerobe counts. The magnitude of this selective effect was greater in subjects with a low initial faecal concentration of bifidobacteria. Faecal digestibility of GUM was around 95% and its caloric value was estimated to range between 5.5 and 7.7 kJ/g. In addition, stool weight increased 30% because of greater faecal water content. Digestive tolerance of GUM was high and not statistically different from that of SUC up to a daily dose of 30 g. Above this dose, the main complaint was excessive flatulence. However, the mean degree of severity remained mild (<1), even at doses >50 g/day. Other intestinal events were rarely reported. Thus GUM is a very well tolerated dietary fibre with bifidogenic properties believed to benefit intestinal health.
Article
The bifidogenic effect of inulin and oligofructose is now well established in various studies, not only in adult participants but also in other age groups. This bifidogenic shift in the composition of the colonic microbiota is likely the basis for the impact of these prebiotic compounds on various parameters of colonic function. Mainly from animal and in vitro studies and also from some human trials, there are indications, for instance, that inulin-type fructans may reduce the production of potentially toxic metabolites and may induce important immune-mediated effects. This review discusses how these changes in the composition and activity of the colonic microbiota may affect gut health in healthy people, including in those who may experience some form of gastrointestinal discomfort.
Article
Polysaccharides with structures resembling components of dietary fiber were fermented by a number of species of anaerobic bacteria from the human colon. Some strains also fermented glycoprotein mucins. The strains that fermented the widest range of polysaccharide substrates were in the two genera Bacteroides and Bifidobacterium. Polysaccharide degrading enzymes from several Bacteroides species have been studied, and in most cases the enzyme activities were cell bound rather than extracellular. In all cases, the polysaccharide degrading enzymes were inducible rather than constitutive. Thus the metabolic activity of the flora could be altered considerably by the amount and type of fiber in the diet, even though the composition of the flora itself remained unchanged. The products of enzyme action included monosaccharides and oligosaccharides of varying chain lengths.
Article
1. Gum arabic is a water-soluble polysaccharide resistant to human gut enzymes and thus can be described as dietary fibre. 2. Using a most-probable-number technique, estimates were made of total anaerobes and of gum-arabic fermenters in the faeces of a volunteer during a contro1 period and during addition of 10 g gum arabic/d to the diet. Using an enrichment technique, the principal bacteria able to utilize gum arabic as the only carbohydrate source were isolated and characterized. 3. Faecal samples were analysed for undegraded gum arabic and, following acid-hydrolysis, for total sugars. 4. The proportion of the faecal flora able to degrade the gum arabic polymer rose from an initial level of 6.5% to more than 50% during gum-arabic ingestion, and subsequently returned to the control level after ingestion ceased. The principal gum-arabic fermenters were species of Bucteroides and Bifdobucterium . 5. Undegraded gum arabic was not detected in any faecal sample nor were there significant differences in the level of total sugars in acid-hydrolysed faeces between gum arabic and control periods. 6. The results presented indicate a direct and rapid change in faecal flora in response to a specific change in the diet of a human volunteer.
Article
Because the human gut microbiota can play a major role in host health, there is currently some interest in the manipulation of the composition of the gut flora towards a potentially more remedial community. Attempts have been made to increase bacterial groups such as Bifidobacterium and Lactobacillus that are perceived as exerting health-promoting properties. Probiotics, defined as microbial food supplements that beneficially affect the host by improving its intestinal microbial balance, have been used to change the composition of colonic microbiota. However, such changes may be transient, and the implantation of exogenous bacteria therefore becomes limited. In contrast, prebiotics are nondigestible food ingredients that beneficially affect the host by selectively stimulating the growth and/or activity of one or a limited number of bacterial species already resident in the colon, and thus attempt to improve host health. Intake of prebiotics can significantly modulate the colonic microbiota by increasing the number of specific bacteria and thus changing the composition of the microbiota. Nondigestible oligosaccharides in general, and fructooligosaccharides in particular, are prebiotics. They have been shown to stimulate the growth of endogenous bifidobacteria, which, after a short feeding period, become predominant in human feces. Moreover, these prebiotics modulate lipid metabolism, most likely via fermentation products. By combining the rationale of pro- and prebiotics, the concept of synbiotics is proposed to characterize some colonic foods with interesting nutritional properties that make these compounds candidates for classification as health-enhancing functional food ingredients.
Article
Chemostat cultures of human faecal bacteria were used to determine the bifidogenic effect of oligofructose, a fermentable carbohydrate found in a number of plants. In single stage continuous culture, oligofructose preferentially enriched for bifidobacteria, in comparison to sucrose and inulin. This stimulatory effect was enhanced at a high dilution rate, high substrate concentration and low pH. These parameters are likely to approximate to those that occur in the proximal colon. Studies with a three-stage continuous culture model of the large intestine confirmed the bifidogenic effect of oligofructose. These in vitro data indicate that an increase in the concentration of fructose-based oligosaccharides in the diet may alter the balance of the gut microflora towards bifidobacteria, a purported health-promoting genus.
Article
Inulin and oligofructose are a significant part of the daily diet of most of the world's population. Daily intakes for the U.S. and Europe have been estimated at up to 10 g, specifically 1-4 g for the 97th percentile in the U.S. Because both inulin and oligofructose are macroingredients, it is difficult to apply classical toxicology tests. Although some high dose animal tests have been performed, none have revealed any toxic effects. The safety of inulin and oligofructose for use in foods was evaluated by many legal authorities worldwide. As a result, both inulin and oligofructose are accepted in most countries as food ingredients that can be used without restrictions in food formulations. In the U.S., a panel of experts performed a generally accepted as safe (GRAS) Self-Affirmation Evaluation in 1992 and concluded similarly. At high doses, increased flatulence and osmotic pressure can cause intestinal discomfort. These doses vary widely from person to person and also depend on the type of food in which inulin or oligofructose is incorporated. With regard to labeling, both inulin and oligofructose are gradually being accepted as "dietary fibers" in most countries around the world. The mention of their "bifidogenic effect" on food labels has also been legally accepted in several countries.