Some Biological Activities of Essential Oils

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Research Article Open Access
Volume 2 • Issue 5 • 1000136
Med Aromat Plants
ISSN: 2167-0412 MAP, an open access journal
Open Access
Review Article
Medicinal & Aromatic Plants
Properzi et al., Med Aromat Plants 2013, 2:5
http://dx.doi.org/10.4172/2167-0412.1000136
Bioactive essential oils: Essential oil as a source of bioactive constituents
*Corresponding author: Alessandro Properzi, Department of Applied Biology,
University of Perugia, Borgo XX giugno 74-06121 Perugia (PG), Italy, E-mail:
properzialessandro@gmail.com
Received September 19, 2013; Accepted September 30, 2013; Published
October 04, 2013
Citation: Properzi A, Angelini P, Bertuzzi G, Venanzoni R (2013) Some Biological
Activities of Essential Oils. Med Aromat Plants 2: 136. doi: 10.4172/2167-
0412.1000136
Copyright: © 2013 Properzi A, et al. This is an open-access article distributed
under the terms of the Creative Commons Attribution License, which permits
unrestricted use, distribution, and reproduction in any medium, provided the
original author and source are credited.
Some Biological Activities of Essential Oils
Alessandro Properzi1*, Paola Angelini1, Gianluigi Bertuzzi2 and Roberto Venanzoni1
1Department of Applied Biology, University of Perugia, Borgo XX giugno 74-06121 Perugia (PG), Italy
2Master Medicina Estetica. Dip.to di Medicina dei sistemi, Università di Roma “Tor Vergata”, Via Montpellier, 1-00133 Roma (RM), Italy
Keywords: Essential oil; Antibacterial agents; Antifungal agents;
Antioxidant agents; Allelochemical agents
Introduction
e aromatic plants had been used since ancient times for a large
number of purpuse, for example, they are used for their preservative
and medicinal properties or to impart avor and aroma to food. In the
past, ‘the father of modern medicine’, Hippocrates, already prescribed
perfume fumigations. e presence of essential oils is one of the main
causes of the pharmaceutical properties of plants. e term ‘essential
oil’ was used for the rst time in the 16th century by the founder of
the discipline of toxicology, Paracelsus von Hohenheim. Paracelsus
named the active component of a drug, ‘Quinta essential’ [1]. Essential
oils are natural multi-component systems, they consist largely in small
molecole, such as terpenes, usually formed from only carbon and
hydrogen, but oen also oxygen containing. Essential oils are used in
perfumes and make-up products, as food preservers and additives, in
sanitary products, in agriculture, and as natural remedies. Moreover,
essential oils are used in massages as mixtures with vegetal oil or in
baths, but most frequently in aromatherapy. ere are several techniques
that can be used to extract essential oils: water distillation, steam
distillation, solvent extraction, expression under pressure, supercritical
uid extractions and subcritical water extractions. Pharmaceutical
and food uses of natural extracts are more widespread as alternatives
to synthetic chemical products to protect the ecological equilibrium.
e type of extraction is chosen according to the purpose of the use.
For pharmaceutical and food uses extraction by steam distillation or
by expression, for example for Citrus, is preferred. For perfume uses,
extraction with lipophilic solvents and sometimes with supercritical
carbon dioxide is favoured. us, the chemical prole of the essential
oil products diers not only in the number of molecules, but also in
the stereochemical types of molecules extracted, according to the type
of extraction. e extraction product can vary in quality, quantity and
in composition, according to climate, soil composition, plant organ,
age and vegetative cycle stage [2,3]. So, in order to obtain essential oils
of constant composition, they have to be extracted under the same
conditions from the same organ of the plant, which has been growing
on the same soil, under the same climate, and has been picked in the
same season. Most of the commercialized essential oils are chemotyped
by gas chromatography and mass spectrometry analysis. Analytical
monographs have been published [4-7], to ensure good quality of
Abstract
Presentation of case: Essential oils and their volatile constituents have been widely used since the middle ages, to
prevent and treat human disease. They have been widely used for bactericidal, fungicidal, antioxidant, allelochemical,
medicinal, cosmetic applications, pharmaceutical, sanitary, cosmetic, agricultural and food industries. They contain some
volatile constituents, such as phenol-derived aromatic components, aliphatic components, terpenes and terpenoids. In
vitro evidence shows that essential oils can act as antibacterial agents against pathogenic fungi and bacterial strains.
Aim: The nality of this review is to aim of attracting the attention of scientic community seeking new drugs from
plant and fungi, as well as to study the pharmaceutical diversity of essential oils.
Conclusion: The data presented show how the old art of “essential oil therapy” is revitalized due to the progress of
scientic knowledge on their mode of action.
essential oils. Do to their antibacterial, antifungal and insecticidal
activities, essential oils have been largely employed for their properties
already observed in natural environment. Nowdays more than 3000
essential oils are known, 300 of which are commercially important,
especially for industries. Some essential oils have particular medicinal
properties that have been praised to cure certain organ dysfunction
or systemic disorder [8-10]. Owing to the new attraction for natural
products like essential oils, despite their wide use and being familiar to
us as fragrances. Improve knowledge on their mode of biological action
will allow to develop new applications in human health, agriculture
and the environment. Some of them constitute eective alternatives
or complements to synthetic compounds of the chemical industry,
without showing the same secondary eects [11].
Essential Oils
Essential oils as antibacterial agents
e Ancient Egyptians used aromatic plants (and the essential
oils content in them) in embalming, in that manner, bacteria stop to
growth and decay was prevent. is was conrmed from strong in vitro
evidence. In fact, essential oils can act as antibacterial agents against
a wide spectrum of pathogenic bacterial strains, including: Listeria
monocytogenes, L. innocua, Salmonella typhimurium, Escherichia coli
O157:H7, Shigella dysenteria, Bacillus cereus, Staphylococcus aureus
and Salmonella typhimurium [8,12-14], and many more [15]. Also,
Commiphora africana (A.Rich.) Endl. essential oil can inhibit some
pathogenic bacterial strains, such as Staphylococcus aureus, Escherichia
coli, Candida albicans [16] and Helicobacter pylori [17]. Helicobacter

Citation: Properzi A, Angelini P, Bertuzzi G, Venanzoni R (2013) Some Biological Activities of Essential Oils. Med Aromat Plants 2: 136. doi:
10.4172/2167-0412.1000136
Page 2 of 4
Volume 2 • Issue 5 • 1000136
Med Aromat Plants
ISSN: 2167-0412 MAP, an open access journal Bioactive essential oils: Essential oil as a source of bioactive constituents
pylori is a Gram-negative microaerophilic bacterium. It is a highly
motile and thought to be an infective agent widely spread on the
world population (more than 50%), this makes it the most common
chronic infection for humans. H. pylori is widely recongnized as a
gastrointestinal pathogen. It is the causative of chronic supercial
gastritis, and is major factor contributing to the pathogenesis of
duodenal ulcer disease.e medical treatment for H. pylori include a
combinations of dierent active substances: antibiotics, H2-blockers,
bismuth subsalicylate, proton pump inhibitors, is well known that multi-
drug therapy is associated with considerable side eects, but there is an
alternative. Few studies have been shown that some traditional herbal
medicines can act against H. pylori; one of this (C. africana) was tested
by Epifano et al. [17]. Antibacterical activity against H. pylori, Gram-
positive (S. aureus, S. epidermis, E. faecalis) and Gram-negative (E. coli,
P. aeruginosa) bacteria was tested in vitro by Epifano et al. [17]. In this
study in vitro agar dilution method was employed for the assessment,
as reccomended by the National Committee for Clinical Laboratory
Standard (2002/2003). e results pointed out that C. africana essential
oil has shown a potent anti-H. pylori activity with MIC values of 1 µl/
ml (much lower than those of the reference compound metronidazole),
while little or no activity against dierent species of Gram-positive and
Gram-negative bacteria has been showed. e results show a selective
antibacterical activity of C. africana essential oil against H. pylori. e
activity of C. africana essential oil against H. Pylori, is comparable to
the one of known antimicrobial agents, but the latter may favour the
emergence of resistant colonies and also present a potential for the
disruption of intestinal microbial ora, which is responsible for side
eects [17].
Essential oils as antifungal agents
Despite of modern knowledge on slaughter hygiene and food,
production techniques show an increasing during the last years, food
safety remaining an increasingly important public health issue [4]. It
has been estimated that as many as 30% of people in industrialised
countries suer from a food borne disease each year, and in 2000, at least
two million people died from diarrhoeal disease worldwide [5]. ere
is, therefore, still a need for new methods of reducing or eliminating
foodborne pathogens, possibly in combination with existing methods
[14]. At the same time, Western society appears to be experiencing a
trend of ‘green’ consumerism [18,19], desiring fewer synthetic food
additives and products with a smaller impact on the environment.
Moreover, the World Health Organization has recently asked for a
worldwide reduction in the consumption of salt that is correlated to the
incidence of cardio-vascular disease [5]. If the level of salt in processed
foods is reduced how reccomend WHO, it is necessary that other
additives will be develop to maintain the safety of foods. ere is, hence,
scope for new methods of making food safe, which have a natural or
‘green’ image. One such possibility is the use of essential oils as food
additives that can act as antibacterial and antifungal additives.
Angelini et al. [20] pointed out the use of essential oils in the
food industry, as natural sanitizing agents; in this study, Angelini et
al. [20] evaluate some antimicrobial activity parameters as mycelial
growth inhibition, minimum inhibitory concentration (MIC) and
minimum fungicidal concentration (MFC) of six essential oils against
Aspergillus niger, Aspergillus terreus, Chaetomium globosum, Penicillium
chrysogenum, Penicillium pinophilum, Trichoderma harzianum and
Trichoderma viride. e antimicrobial activity of essential oils was
monitored by the macrodiluition technique. e mycelial growth
inhibition, fungistatic and fungicidal concentrations were recorded for
each strain that showed sensitivity to the essential oils. e essential
oils of catnip, cinnamon, tea tree and thyme essential oils exhibited a
large spectrum antimicrobial activities; those of clary sage and laurel
inhibited the mycelial growth in a few fungal strains. e essential oils
of cinnamon and thyme had the lowest MIC and MFC values against all
the fungi assayed, followed by catnip, tea tree, clary sage and laurel [20].
In the last two decades, there has been a considerable increase in the
incidence of life-threatening systemic fungal infections. e challenge
has been to develop strong strategies for treating fungal diseases, to
treat opportunistic fungal infections in human immunodeciency
virus-positive patients, and others who are immunocompromised due
to cancer chemotherapy or the indiscriminate use of antibiotics [21,22].
Most clinically-used antifungal drugs have various drawbacks. ey
are pretty toxic, they have a low ecacy and high cost, furthermore,
their frequent use has produced resistant strains [23]; therefore, there
is a great need for new antifungals that concern to a wide range of
structural classes, that can selectively work on new targets with fewer
side eects [24,25].
Strong in vitro evidence indicates that some essential oils like
ymus schimperi Ronniger essential oil, can act as antibacterial
agents against a wide spectrumof pathogenic fungal isolates including
(Penicillium chrysogenum, Verticillium sp., Aspergillus tubingensis,
Aspergillus minutus, Beauveria bassiana and Microsporum gypseum)
[26]. In vitro susceptibility testing of the isolates to conventional
antifungal agents and to two chemically well-dened chemotypes of
T. schimperi essential oil was performed. Most of the isolated fungi
were resistant to amphotericin B (except A. minutus), and itraconazole,
while terbinane was quite active on these fungi. T. schimperi essential
oil showed antifungal activity against all of the tested fungal isolates.
e minimal inhibitory concentration values was similar or lower
than those of terbinane. Considerable morphological and cytological
changes revealed by transmission electron microscopy analyses, occur
when essential oil inhibit fungal growth [26].
Also, Tirillini et al. [27] focused our investigation on the
antifungal activities of Laserpitium garganicum subsp. garganicum
(Ten.) Bertol essential oil. L. garganicum subsp. garganicum (Ten.)
Bertol. (=Laserpitium siler L. subsp. garganicum (Ten.) Arcangeli) is
a perennial herb belonging to the Apiaceae family. e distribution is
limited to the southern area of the Balkan peninsula and Italy. In Italy,
this plant is found in the central Apennines, Sicily and Sardinia. is
plant is described as a subspecies of L. siler or a species of Laserpitium
in the Flora Europaea and the Flora d’Italia, respectively. Tirillini et
al. [27] tested L. garganicum subsp. garganicum essential oil against
some phytopathogens and opportunistic human fungi. A few studies
have reported the biologically active components isolated from L. siler,
mainly sesquiterpene lactones, and one refers to sesquiterpene lactones
from the roots of L. garganicum. Tirillini et al. [27] identied y-six
compounds in L. garganicum essential oil, representing 92.3% of the
total oil.
Table 1 shows the anfungal activity of the essential oil of L.
garganicum [27].
Essential oils as antioxidant agents
Free radicals and other reactive oxygen species produce oxidation
of proteins, amino acids, unsaturated lipids and DNA. Reactive oxygen
species produce molecular alterations related to aging, arteriosclerosis
and cancer [28], Alzheimer’s disease [29], Parkinson’s disease, diabetes
and asthma [30]. e human body has defense mechanisms against
free radicals present in almost all cells [31]. Is possible that occur an

Citation: Properzi A, Angelini P, Bertuzzi G, Venanzoni R (2013) Some Biological Activities of Essential Oils. Med Aromat Plants 2: 136. doi:
10.4172/2167-0412.1000136
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Volume 2 • Issue 5 • 1000136
Med Aromat Plants
ISSN: 2167-0412 MAP, an open access journal Bioactive essential oils: Essential oil as a source of bioactive constituents
imbalance between free radical production and their removal by
the body’s antioxidant system; this imbalance bring to a phenomena
known as ‘oxidative stress’ [32,33]. Balance between free radicals and
antioxidants can be recovered from an external supply of antioxidants.
Essential oils are rich in phenolic compounds, and for this reason,
attract investigators to evaluate their activity as antioxidants or free
radical scavengers. e essential oils of basil, cinnamon, clove, nutmeg,
oregano and thyme have proven radical-scavenging and antioxidant
properties in the DPPH radical assay at room temperature [34]. e
order of eectiveness was found to be: clove>>cinnamon>nutmeg>basil
≥ oregano>>thyme. e essential oil of ymus serpyllum L. showed a
free radical scavenging activity close to that of the synthetic butylated
hydroxytoluene (BHT) in a β-carotene/linoleic acid system [35]. e
antioxidant activity was attributed to the high content of the phenolics
thymol and carvacrol (20.5% and 58.1%, respectively).
Bertuzzi et al. [36] investigates the action of Citrus×limonum
Risso essential oil to control free radical-induced lipid peroxidation
and preventing tissue damage in skin. In this study, the essential oil
was analized by GC-MS technics. e superoxide anion scavenging
activity of C. limonum essential oil was evaluated by the enzymatic
hypoxanthine/xanthine oxidase system. e antiradical activity was
tested on human volunteers aer UV ray ex position. e essential
oil was diluted in DMSO or grape-seed oil, then it was spread on
the face of human volunteers. e presence of peroxyl radicals was
detected on a sample skin lipids that has been previously collected.
e detection of peroxyl radicals based on the measurement of light
emitted (chemiluminescence), when the excited carbonyl and singlet
oxygen decay to ground state. Bertuzzi et al. [36] demonstrate that the
lemon essential oil is more active than a-tocopherol against O2- and
peroxide free radical inhibition at 1: 100 dilution, therefore, protocol
for controlling free radical-induced lipid peroxidation in human
skin was thus proposed. e results of the study by Bertuzzi et al.
[36] suggest that lemon essential oil has properties that could benet
human skin, as it undergoes environmental and chronological ageing,
therefore, the scavenging action of lemon essential oil could have a
practical application for treating human skin against oxidative damage
[36]. e scavenging action of lemon essential oil solubilized in grape-
seed oil could have a practical application in aesthetic medicine for
treating human skin against oxidative damage. erefore, continuous
application of lemon essential oil solubilized in grape-seed oil might
contribute to the prevention of lifestyle-related skin diseases by
regulating the balance of oxidative stress [36].
Essential oil as allelochemical agents
Although oleogumresins/essential oils are well known antimicrobial
agents, they stimulates some microorganisms and use them as carbon
energy sources [37,38]. Angelini et al. [39] suggest that the weak
parasitism of P. eryngii spp.-complex on roots and stems of umbellifers
(family Apiaceae, genera Eryngium, Ferula, Ferulago, Cachrys,
Laserpitium, Diplotaenia and Elaeoselinum) is mediated by allelopathic
interactions. e oleogum-resin/essential oils (or their components)
shis the microrganism balance in favour of those microrganisms (e.g.
Pleurotus spp.) that can tolerate them. Some even use them as a carbon
and energy source [39,40].
e term “Allelopathy” has undergone several changes over time
[41,42]. e denition adopted by the International Allelopathy
Society (IAS) in 1996 is “e science that studies any process involving
secondary metabolites produced by plants, algae, bacteria and fungi that
inuences the growth and development of agricultural and biological
systems”. Allelopathic interactions derive from the production of
secondary metabolites. e secondary metabolites are synthesized for
a wide range defense by plant and microorganisms. e secondary
metabolites involved are called allelochemicals [43].
Trichoderma harzianum is a fungal contaminant that causes
extensive losses in the cultivation of Pleurotus species. Melaleuca
alternifolia (Maiden and Betche) Cheel (tea tree) essential oil was
investigated by Angelini et al. [39]. is essential oil have “in vitro”
allelopathic ability to control Trichoderma harzianum. e antifungal
activity of M. alternifolia essential oil and antagonist activities between
Pleurotus species against three T. harzianum strains were studied in
dual-culture experiments. e dual-culture was realized on an agar-
based medium, in which dierent concentrations of essential oil
were incorporated. M. alternifolia essential oil at a concentration of
0.625 l L/mL, inhibited T. harzianum mycelial growth by 5.9-9.0%,
depending on the strain. At the same concentrations P. ferulae and P.
nebrodensis stimulated mycelial growth by 5.2-8.1%. All strains of T.
harzianum were antagonistic to the Pleurotus species in the control.
When essential oil was added to the substrate cultural, the antagonistic
activity of T. harzianum against the Pleurotus species was weak (0.0625
l L of essential oil) or non-existent (0.125 l L of essential oil). Currently,
synthetic chemicals are currently used to prevent and control T.
harzianum in mushroom cultivation; M. alternifolia essential oil could
be an alternative to the synthetic [44].
Essential oils, aromatherapy: From at least 4000 years, essential
oils are used by man to for prevention and treatment of many disorders.
Due to the balancing properties of essential oils, a type of “alternative
medicine” called aromatherapy has been developed. Aromatherapy
is dened as the treatment or disorders prevention by the use of
essential oils. Aromatherapy is a complementary medicine that can be
considered a branch of phytotherapy; it combines two words: aroma
(a fragrance) and therapy (a treatment). Our sense of smell access to
the brain’s limbic system, which is an anatomical structure that is our
emotional “part”, to spread the ‘essential oil in the environment is used
burners, nebulizers and diusers. A source of heat to evaporate the
essential oil previously diluted in water. e heat is used to dissolve
the oil in the water, which otherwise would not be water-soluble, only
aroma delivery through inhalation, to induce psychological or physical
eects, can be dened as aromatherapy [45]. Nevertheless, the clinical
use of essential oils and their volatile constituents via inhalation or
massage has expanded worldwide.
Conclusion
e studies reviewed in this article are intended for retrieving the
attention of scientic community on the wide range of application
of essential oils. ey can provide to develop new drugs from
natural products. us, essential oils and their constituents can
hopefully be considered in the future for more clinical evaluations
Microorganism % Inhibition*
0.125 µL/mL** 0.250 µL/mL** 0.5 µL/mL** 1 µL/mL**
A. niger 21 ± 7 31 ± 6 32 ± 4 28 ± 4
A. terreus n.i. 14 ± 5 17 ± 5 22 ± 6
C. globosum n.i 22 ± 3 22 ± 4 20 ± 4
P. chrisogenum n.i. 10 ± 4 15 ± 5 47 ± 5
P. pinophilum 23 ± 6 28 ± 5 34 ± 5 54 ± 4
T. viride 13 ± 4 33 ± 3 42 ± 4 67 ± 2
*The data are the mean of triplicate values ± SD.
**Essential oil content (µL/mL cultured medium)
n.i.: no inhibition.
Table 1: Antimicrobic activity of the essential oil of L. garganicum

Citation: Properzi A, Angelini P, Bertuzzi G, Venanzoni R (2013) Some Biological Activities of Essential Oils. Med Aromat Plants 2: 136. doi:
10.4172/2167-0412.1000136
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Volume 2 • Issue 5 • 1000136
Med Aromat Plants
ISSN: 2167-0412 MAP, an open access journal Bioactive essential oils: Essential oil as a source of bioactive constituents
and possible applications, and as adjuvants to current medications.
e data presented provide a basis for reviving investigation on the
pharmaceutical diversity of essential oils.
Our topical modern scientic knowledge can help to reinterpret old
art of ‘essential oil therapy’, how described here.
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