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ANTI-BACTERIAL EFFECTS OF AFRAMOMUM MELEGUETA SEED EXTRACTS ON SOME ENTEROBACTERIACEAE ORGANISMS

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The anti-bacterial effects of the methanol, ethanol and aqueous extracts of A. melegueta seeds were investigated on some enterobacteriaceae organisms (Escherichia coli, Klebsiella pneumoniae, Salmonella tyhi and Shigella spp). The organisms tested showed varying degrees of sensitivity to the various extracts with the aqueous extract having the least activity when compared to the ethanol and methanol extracts which had closely inhibitory effects. The ethanol extract had higher zones of inhibition on the organisms than the methanol extract in the decreasing order: E. coli (21.5 mm), Shigella spp (17.0 mm), S. tyhi (11.5 mm) and K. pneumoniae (9.0 mm). The zones of inhibition exerted on the organisms by the methanol extract were in the decreasing order: S. tyhi (15.0 mm), E. coli (13.5 mm), Shigella spp (12.0 mm) and K. pneumoniae (0.0 mm). This study shows that the seeds of A. melegueta possess active ingredients that may be exploited for the development of anti-microbials and alternative remedies for infections and diseases caused by the tested organisms.
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304
Odo et al. World Journal of Pharmaceutical Research
ANTI-BACTERIAL EFFECTS OF AFRAMOMUM MELEGUETA SEED
EXTRACTS ON SOME ENTEROBACTERIACEAE ORGANISMS
Ukaegbu-Obi, K.M.1, Odo, C.E.2,3* and Awa, C.1
1Department of Microbiology, College of Natural Science, Michael Okpara University of
Agriculture, Umudike, PMB 7267, Umuahia, Abia State, Nigeria.
2Department of Biochemistry, College of Natural Science, Michael Okpara University of
Agriculture, Umudike, PMB 7267, Umuahia, Abia State, Nigeria.
3Department of Biochemistry, Faculty of Biological Science, University of Nigeria, Nsukka,
Enugu State, Nigeria.
ABSTRACT
The anti-bacterial effects of the methanol, ethanol and aqueous extracts
of A. melegueta seeds were investigated on some enterobacteriaceae
organisms (Escherichia coli, Klebsiella pneumoniae, Salmonella tyhi
and Shigella spp). The organisms tested showed varying degrees of
sensitivity to the various extracts with the aqueous extract having the
least activity when compared to the ethanol and methanol extracts
which had closely inhibitory effects. The ethanol extract had higher
zones of inhibition on the organisms than the methanol extract in the
decreasing order: E. coli (21.5 mm), Shigella spp (17.0 mm), S. tyhi
(11.5 mm) and K. pneumoniae (9.0 mm). The zones of inhibition
exerted on the organisms by the methanol extract were in the
decreasing order: S. tyhi (15.0 mm), E. coli (13.5 mm), Shigella spp
(12.0 mm) and K. pneumoniae (0.0 mm). This study shows that the seeds of A. melegueta
possess active ingredients that may be exploited
for the development of anti-microbials and alternative remedies for infections and diseases
caused by the tested organisms.
KEYWORDS: A. melegueta, anti-bacterial, enterobacteriaceae, sensitivity and inhibition.
World Journal of Pharmaceutical Research
SJIF Impact Factor 5.045
Volume 4, Issue 1, 304-309. Research Article ISSN 2277 7105
Article Received on
01 Nov 2014,
Revised on 25 Nov 2014,
Accepted on 20 Dec 2014
*Correspondence for
Author
Odo, C.E.
Department of
Biochemistry, College of
Natural Science, Michael
Okpara University of
Agriculture, Umudike,
PMB 7267, Umuahia,
Abia State, Nigeria.
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305
Odo et al. World Journal of Pharmaceutical Research
INTRODUCTION
Since prehistoric times, plants and their extracts have been used for their healing properties.
Ancient Egyptians, for example, chewed willow bark to relieve fever and headaches.
Thousands of years later, scientists discovered that the bark contains salicylic acid, the active
ingredient used in making aspirin.[1] Medieval doctors believe that baldness could be cured
by rubbing an onion on the scalp.[2] Even today, we are still using compounds derived from
plants. Atropine employed in treating certain heart conditions and relaxing the muscles of the
eyes was originally obtained from the deadly nightshade plant.[3] Plants with potent bioactive
are regarded as components of phytomedicine.[4] Foxgloves contain a substance called
digitoxin which was used to treat an irregular heart beat and drugs based on this substance are
still currently in use.[5]
A. melegueta (of the family, Zingiberaceae) is a spice in the ginger family with the common
name of “grains of paradise” or “alligator pepper”. The spice is used in West Africa for the
purpose of alleviating stomach ache and diarrhoea as well as hypertension with some limited
reports on it being used for tuberculosis and as a remedy for snake bites and scorpion
stings.[6] The seeds also tend to have general anti-microbial properties similar to many
species. They have also been shown to have some molluscidal and repellant properties. They
are one of the many pungents said to aid in sexuality and aphrodisia (although the class of
pungent herbs appears to be mentioned more than A. melegueta seeds).[7] Despite the
acclaimed anti-microbial potential of A. melegueta seeds, there is hitherto, dearth of available
data regarding their anti-bacterial property and hence, the thrust of this study was to evaluate
the anti-bacterial effects of the methanol, ethanol and aqueous extracts of A. melegueta seeds
on some enterobacteriaceae organisms.
MATERIALS AND METHODS
Collection and Identification of the Plant Seeds
The seeds of A. melegueta were bought from Umuahia market in Umuahia North Local
Government Area of Abia State, Nigeria. The seeds were identified and authenticated by a
taxonomist at the Taxonomy Section of Forestry Department, Michael Okpara University of
Agriculture, Umudike, Abia State, Nigeria.
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Odo et al. World Journal of Pharmaceutical Research
Preparation of the Plant Seeds
The seeds of A. melegueta were washed with distilled water, sun-dried for one week and
ground into uniform powder using an industrial milling machine. The ground powder was
stored in an air-tight container in readiness for the extraction process.
Extraction Procedure
The ground seeds were extracted using distilled water, 70% ethanol and 70% methanol as
previously described.[8] The aqueous extract was prepared by soaking 20 g of the ground
seeds in 100 ml of distilled water in a conical flask and stirring the mixture vigorously with a
glass rod for proper extraction. The mixture was allowed to stand for 24 hours at room
temperature after which it was filtered using Whatman No. 1 filter paper. The filtrate was
concentrated at 45oC under reduced pressure using a rotary vacuum evaporator and stored at
4oC until used. The ethanol and methanol extracts were obtained using the same procedure.
Collection and Maintenance of the Test Organisms
The test organisms: E. coli, K. pneumoniae, S. typhi and Shigella spp were obtained from the
stock cultures of the Microbiology Laboratory of Federal Medical Centre, Umuahia, Abia
State, Nigeria. The identity of the test organisms were reconfirmed and stored at 4oC in
nutrient agar slants.
Reconstitution of the Extracts
One gram of each of the extracts was reconstituted with 2 ml of dimethyl sulfoxide (DMSO)
to obtain a concentration of 500 mg/ml of each extract. The test tubes were labeled according
to their content concentrations.
Anti-bacterial Activity
The anti-bacterial activities of the extracts were determined using the disc diffusion method
as previously described.[9] In this method, the disc which had initially being impregnated with
the extracts were aseptically picked using a pair of sterile forceps and placed on the surface of
the different plates which had initially being inoculated with a pure culture of the test
organisms using streak method. E. coli was cultured on a nutrient agar. K. pneumoniae was
cultured using MacConkey agar while S. typi and Shigella spp were cultured on Salmonella
Shigella Agar (SSA). The plates were incubated at 37oC for 24 hours and the sensitivity of
the organisms to the extracts was measured using a meter rule.
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RESULTS
As shown in Table 1, the water extract had the least zones of inhibition on the test organisms.
It slightly inhibited the growth of S. typhi and E. coli with inhibition zones of 9 and 11 mm
respectively. However, it did not inhibit the growth of K. pneumoniae and Shigella ssp. The
ethanol extract had the highest zones of inhibition on the test organisms. The highest zone of
inhibition was 21.5 mm on E. coli while the least zone of inhibition was 9.0 mm on K.
pneumoniae. S. typhi and Shigella ssp both had inhibition zones of 11.5 and 17 mm
respectively. The methanol extract did not inhibit the growth of K. pneumoniae. S. typhi had
the highest zone of inhibition (15 mm) while Shigella ssp and E. coli both had inhibition
zones of 12 and 13.5 mm respectively. The ethanol and methanol extracts showed higher
inhibitory zones than the water (aqueous) extract.
Table 1: Anti-bacterial activities of the extracts of the seeds of A. melegueta on the test
organisms.
Organisms
Ethanol
Methanol
Water
E. coli
21.5
13.5
11
S. typhi
11.5
15
9
K. pneumoniae
9.0
0.0
0.0
Shigella spp
17
12
0.0
Values in the table indicate zones of inhibitions in millimetres (mm)
DISCUSSION
That the aqueous, methanol and ethanol extracts of the seeds of A. melegueta inhibited the
growth of all bacteria tested as shown by the various zones of inhibition, indicates an anti-
bacterial activity of the plant. Anti-bacterial activities of the extracts on the organisms were
observed in the order: E. coli > S. typhi > Shigella ssp > K. pneumoniae. This is similar to the
earlier report.[8]
The difference in the anti-microbial properties of a plant extract might be attributable to the
age of the plant used, freshness of the plant materials, physical factors (temperature, light and
water), contamination by field microbes, adulteration and substitution of the plant, incorrect
preparation and dosage.[10] In the same vein,[11] reported that inactivity of plant extracts may
be due to the age of the plant, extracting solvent, method of extraction and time of harvesting
the plant material.
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Odo et al. World Journal of Pharmaceutical Research
The anti-bacterial effect of the seeds of A. melegueta may be due to the phytochemical
constituents in them. A. melegueta seeds are rich in phytonutrients such as flavonoids,
phenolic compounds, tannins, saponins, terpenoids, cardiac glycosides and alkaloids.[12] The
biological functions of flavonoids include: protection against allergies, inflammation, free
radicals, platelet aggregation, microbes, ulcers, hepatotoxin, viruses and tumours. This may
be the reason behind the use of the extracts of this plant in the treatment of intestinal troubles
in herbal medicine.[13] The presence of phenolic compounds in the seeds of A. melegueta
indicates that this plant might serve as an anti-microbial agent. This is because phenols and
phenol compounds have been extensively used in disinfection and remain the standards with
which other bactericides are compared. Phenolic compounds as electron donors are readily
oxidised to form phenolate ion or guanine, an electron acceptor. Protonated phenol is used as
a cleaning agent as it has potent anti-septic or bactericidal property.[14]
In conclusion, this study shows that the extracts of the seeds of A. melegueta possess anti-
bacterial activities against the tested isolates. Also, this work indicates that ethanol and
methanol are better solvents than water for the extraction of the active ingredients of the
seeds of A. melegueta. Further studies on more effective method of extracting only the
necessary constituents and standard reconstitution means as well as other processing, refining
and purification measures are recommended.
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[Cajanus cajan (L) Mill sp.] on some human pathogens). Journal of Herbs, Spices and
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11. Amadioha AC, Obi VI. (Control of anthranose disease of cowpea by Cymbopogon
oitratus and Ocimum gratissimum). Acta Phytopathologia et Entomological Hungarica,
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... Since prehistoric times, plants and their extracts have been used for their healing properties. [10] In this study, we examined the effects of the ethyl acetate root extract of S. jollyanum on some biochemical parameters of alloxan-induced diabetes in rats. ...
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Control of anthranose disease of cowpea by Cymbopogon oitratus and Ocimum gratissimum). Acta Phytopathologia et Entomological Hungarica
  • A C Amadioha
  • V I Obi
Amadioha AC, Obi VI. (Control of anthranose disease of cowpea by Cymbopogon oitratus and Ocimum gratissimum). Acta Phytopathologia et Entomological Hungarica, 1999; 34(1-2): 83-89.