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African Journal of Biomedical Research
Ibadan Biomedical Communications Group
ISSN: 1119-5096
Vol. 9, Num. 3, 2006, pp. 205-211
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African Journal of Biomedical Research, Vol. 9, No. 3, Sept, 2006, pp. 205-211
Full Length Research Article
In-vitro Anti-Microbial
and Brine-Shrimp Lethality Potential of the Leaves and Stem of Calotropis
procera (Ait).
*1Oladimeji, H.O, 2Nia, R and 1Essien,
E. E.
1Department of Pharmaceutical and Medicinal Chemistry, Faculty of Pharmacy, University of Uyo,
Uyo
2Department of Pharmacognosy and Traditional Medicine,Faculty of Pharmacy, University
of Uyo, Uyo
*Address
for Correspondence (e-mail): (08023348195,
wale430@yahoo.co.uk).
Received: February
2006
Accepted
(Revised): August
2006
Published: September
2006
Code Number: md06033
ABSTRACT
Calotropis procera
(Family, Asclepiadeae) is implicated in a variety of ethno-medicinal
therapies ranging form oral, skin, gastro-intestinal to respiratory problems.
The effects of this plant on the sensitivity of micro-organisms need
verification and its potential for cytotoxicity needs to be investigated. Thus,
the anti-microbial and brineshrimp lethality studies on the leaves and stem
were carried out. The crude ethanolic extract of the stem and its ethylacetate
fraction elicited good antibacterial activity against clinical strains of Bacillus
subtilis, Staphylococcus aureus but gave minimal activity against Escherichia coli,
Klebsiella pneumoniae and Salmonella typhi but none against the fungal isolate;
Candida albicans. The brine-shrimp lethality assay analyzed using the Finney
probit method showed that the crude ethanolic extracts of the leaves and stem
displayed LD50 values at 192 ppm and 182 ppm respectively. These
findings indicate the potential of the plant as panacea for infectious diseases
and also reveal a novel potential in the fight against tumors in man.
Keywords: Anti-microbial, extracts, fractions, brine-shrimp
lethality, Calotropis procera
INTRODUCTION
The
genus, Calotropis belongs to the Family, Asclepiadeae. The
species found in this genus include C.busseana,C.inflexa,C.syrica and
C.procera.Calotropis procera(Ait)is a drought-resistant,
salt-tolerant weed found along degraded roadsides, lagoon edges and in
overgrazed pastures. It is native to Nigeria and many other countries in
tropical Africa, Asia and Latin America where the plant is of high
socio-economic value (F.A.O.1986; Abbas et al,1992).
The
bark is used traditionally in the treatment of coughs, dermatitis, dysentery,
elephantiasis, jaundice, leprosy, sore-gums swellings and ulcers(von
Maydell,1986). It is also used in dehairing hides, tanning, brewing, curdling
milk and as an arrow and spear poison (Leeuwenberg,1987).
The
latex is used on conjunctiva, epiphora, in local anesthesia, to treat ringworm
and other skin diseases. It also serves as a source of renewable energy,
hydrocarbons (Arora,1982), green manure, sulphur dioxide emission and an
indication of exhaust soil (Leeuwenberg,1987).
The
flower is used as a digestive, tonic for asthma and catarrh while the sap
serves as a rubefacient and purgative. The floss of the seeds is used as
substitute cotton wool in surgical operations (von Maydell, 1986).
The
leaves are eaten by goats, occasionally sheep in times of need but rarely by
cattle and other livestock because they are slightly toxic. The stem is used in
native roofing of huts and also as source of charcoal (Taylor,2004). Compounds
such as asclepsin and mudarin reportedly isolated from this plant have been
found to posses emeto-cathartic, digitalic, bactericidal and vermicidal
properties while calotropin is cardio-toxic (Taylor,2004).
Consequently,
this study was embarked upon to confirm or otherwise, the sensitivity of
microbes to extracts of the plant and also to investigate its potential for cytotoxic
activity
MATERIALS
AND METHODS
Plant collection,
identification and authentication.
The
fresh leaves and stem of Calotropis procera (Ait) were collected
throughout the month of November, 2004 at a location inside the University of
Uyo (Main campus) Uyo, Akwa Ibom State. These plant parts were identified and
authenticated by the taxonomist of Faculty of Pharmacy where voucher specimens
(NoH43) and (NoH44) were deposited.
Chemicals,
media, micro-organisms and other materials.
Chemical
reagents: The reagents used in this
study were, Butanol, Chloroform, Ethanol and Methanol; all of AnalaR grade(East
Anglia Chemicals Limited, England), Silica gel (254GF), Streptomycin sulphate
and Nystatin(Unique Pharmaceuticals, Lagos, Nigeria).
Culture
media: The media used were Mueller Hinton II
Agar (Biotec Oxiod Limited, England, No13904) and Sabouraud Dextrose Agar (International
Diagnostic Group, England, No049041).
Micro-organisms:The
micro-organisms(Bacillus subtilis, Staphylococcus aureus, Escherichia
coli, Klebsiella pneumoniae, Salmonella typhi and Candida
albicans) clinically isolated from human specimens; urine, faeces, wounds
and vaginal swabs originally obtained from the University of Uyo Teaching
Hospital, Uyo were collected in sterile bottles and refrigerated at 0-5°C.
They were then subjected to laid down convectional biochemical methods (Gibson
and Khoury,1986; Murray et al,1985) for identification and preservation.
Other
materials: Sea
water was collected from Kuramo Beach, Lagos, brine- shrimp eggs; Artemia
salina (Leach) (San Francisco Bay Brand Inc. Newark, CA 94560, U.S.A.) and
plastic soap case.
Extraction and processing
The plant parts i.e. the leaves and stem of C.
procera were air dried and powdered respectively on an electric mill. The
resultant ground powders were then extracted with 50% aqueous ethanol at room
temperature(25°C) for 72h. The filtrates were evaporated to dryness
using a rotary evaporator (Buchi CH-9230, Laboratorium-Technic,Flawk/SG,
Switzerland). The dried crude ethanolic extracts were then investigated for
plant metabolites (alkaloids, saponins, tannins, cardiac glycosides, terpenes,
anthraquinones, phlobotannins and
flavonoids) as described in phytochemical methods (Stahl et al,1965;Brain
and Turner,1975;Harbone,1984; Akerele,1984;Trease and Evans,1989).
The
dried crude ethanolic extracts were dissolved in water and then chromatographed
respectively on silica gel (254GF) column with chloroform: ethylacetate:
butanol(1:1:1) mixture in a gradient elution. Eluates showing similar (T.L.C)
profiles were pooled and bulked separately resulting in chloroform,
ethylacetate and butanol fractions which were evaporated to dryness and then
subjected to anti-microbial screening.
Anti-microbial
sensitivity test:
The
media (Mueller Hinton II Agar and Sabouraud Dextrose Agar) were prepared
according to Manufacturers instructions, poured into large sterile
petri-dishes (diameter,13.5cm) and allowed to set. The Agar-cup diffusion
method was employed for the anti-microbial susceptibility testing. 20ml of the
media agar seeded with 0.1ml of 10-2 dilution of the organisms were
introduced into the petri-dishes. After solidification, uniform and equidistant
wells of 6mm diameter were cut in the agar by using a sterile cork-
borer(Washington,1995).
Concentrations of 20mg/ml and 40mg/ml of the dried
crude ethanolic extracts and the fractions at 5mg/ml dissolved in de-ionized
water were separately introduced into wells. Also, concentrations of 1mg/ml of
Streptomycin sulphate, 1mg/ml of Nystatin and de-ionized water were introduced
into separate wells as positive and negative controls respectively. The
experiments were carried out in triplicates. The plates were left at room temperature
(25-30°C) for 2h to allow for diffusion and then incubated at 37°C
for 24h.
Zones
of growth inhibition were measured in millimeters (mm). Thereafter, the minimum
inhibitory concentration (M.I.C.);the lowest concentration of a sample that
inhibits the growth of a micro-organism was determined by the standard serial
dilution technique (Hugo and Russel, 1994; Washington,1995) using the Mueller
Hinton II Agar and
Sabouraud Dextrose Agar as media for the bacteria and fungus respectively.
Brine-shrimp
lethality assay
Hatching of shrimp eggs
Some
sea water was placed in a small plastic with perforated dividing dam which was
fabricated from a plastic soap case. Some shrimp eggs were added to one side of
the divided dam tank. This side was darkened by covering it with a plastic lid
while the other compartment was exposed. The set- up was left for 48h for the
shrimp eggs to hatch and mature as nauplii. Mature nauplii usually swim to the
exposed compartment.
Preparation of vials for
testing
A
stock solution of sample was prepared by dissolving 20mg of the sample in 2ml
methanol/de-ionized water (1:1v/v). To obtain the desired final concentrations
such as 1000mg/ml, 100mg/ml and 10mg/ml; 0.5ml, 0.05ml and 0.005ml of the stock were transferred into the
three vials respectively.
The
solvent was then evaporated by leaving the vials in a vacuum desiccator for
24h. Ten shrimp nauplii were counted into each vial(i.e.30 nauplii per
dilution).The total volume of solution in each vial was adjusted to 5ml by
adding the sea water (5ml/vial). The control (methanol/de-ionized water
(1:1v/v) was prepared in the same way except that the sample was omitted. The
vials were maintained in the laboratory with normal fluorescent illumination
and the set-up left for 24h.The number of survivors usually swimming was
counted with the aid of a magnifying lens for each of the vials at the end of
24h.Thus, the number of the dead was computed; hence the LD50 in
p.p.m. (parts per million) was determined using the Finney probit analysis software
(McLauglin,1988; McLauglin et al,1991).
RESULTS
AND DISCUSSION
The
phytochemical screening of the crude ethanolic extracts of leaves and stem of Calotropis
procera showed that they both contain alkaloids, saponins, tannins, cardiac
glycosides, terpenes, flavonoids and phlobotannins (Table 1).This confirms
previous studies as reported in Taylor (2004). However, anthraquinones were
absent in both extracts.
From
the anti-microbial results presented on Table 2, it could be inferred that the
extracts elicited concentration-dependent activities. The crude ethanolic
extract of the stem gave higher antibacterial activity against B.subtilis
and S.aureus than the extract of the leaves. However, the activity
given by both extracts against E.coli, K.pneumoniae and S.typhi
were comparably less.(Table 2).This is not surprising because both extracts
tested positive for tannins which had been implicated in previous studies to
be anti-microbial (Adesina, et al, 2000;Burapadaja and Bunchoo,1995).It
is very probable that these bioactive compounds might have played a
significantly similar role in the observed activity. Furthermore, these results
have partly justified some of the uses of the plant in ethno-medicine (von
Maydell,1986).
The
activity recorded by these extracts then necessitated their purification by
chromatography into fractions.
Table 1. The phytochemical screening
of the crude ethanolic extracts of leaves and stem of Calotropis procera(Ait).
Test |
A |
B |
1. Alkaloids:
(a) Dragendoffs
(b) Meyers
|
++ |
++ |
2.Saponins:
(a) Frothing
(b) Emulsion
|
++ |
++ |
3.Tannins:
Ferric Chloride
|
+ |
+ |
4.Cardiac glycosides
(a) Salkowskis
(b) Liebermann-Burchards
|
+++
+++
|
+++
+++
|
5.Terpenes:
Sulphuric acid
|
+++
|
+++
|
6.Anthraquinones:
Borntragers
|
_ |
_ |
7.Phlobotannins:
Hydrochloric acid
|
+
|
+
|
8.Flavonoids:
Shinodas
|
+
|
+
|
Key: A - Crude ethanolic extract of the leaves; B
- Crude ethanolic extract of the stem. + - Trace; ++ - Moderate; +++
- Abundant; - - Absent
Table 2. The antimicrobial
sensitivity of the crude ethanolic extracts and fractions of leaves and stem of
Calotropis procera in de-ionized water.
Test organism |
Diameter
of zone of inhibition in millimeters (mm) 0.5mm |
A/mg/ml |
A1 A2
A3
5mg/ml |
B/mg/ml |
B1 B2
B3
5mg/ml |
STP
1mg/ml |
NYS
1mg/ml |
CN
|
20 |
40 |
20 |
40 |
B. subtilis |
10 |
12 |
14 |
15 |
14 |
13 |
14 |
14 |
18 |
15 |
10 |
12 |
6 |
S.aureus |
11 |
13 |
13 |
16 |
14 |
14 |
15 |
14 |
18 |
16 |
19 |
11 |
6 |
E. coli |
9 |
11 |
10 |
12 |
11 |
10 |
12 |
10 |
14 |
12 |
15 |
12 |
6 |
K.pneumoniae |
9.5 |
11 |
11 |
13 |
12 |
11 |
12 |
11 |
14 |
13 |
15 |
10 |
6 |
S.typhi |
10 |
11 |
11 |
13 |
11.5 |
10 |
11 |
10 |
11 |
12.5 |
16 |
10 |
6 |
C.albicans |
7 |
7.5 |
7.5 |
7.5 |
7.5 |
7.5 |
8 |
8 |
8 |
8 |
10 |
20 |
6 |
Key: *The diameter of
zone of inhibition is zone of inhibition and cup-size (6mm)
A - Crude ethanolic extract
of leaves; A1 - Chloroform fraction of A; A2 -
Ethylacetate fraction of A
A3 - Butanol
fraction of A; B - Crude ethanolic extract of stem; B1 - Chloroform
fraction of B; B2 - Ethylacetate fraction of B; B3
- Butanol fraction of B; STP - Streptomycin sulphate; NYS Nystatin;
CN Control (De-ionized water)
Table 3. The minimum inhibitory
concentration (M.I.C.) of the crude ethanolic extracts and the ethylacetate
fractions of leaves and stem of Calotropis procera on test microbes
Test microbe |
M.I.C.(mg/ml)a |
A |
B |
A2 |
B2 |
STP |
NYS |
|
B. subtilis |
400 |
300 |
300 |
250 |
1.8 |
ND |
|
S. aureus |
400 |
350 |
350 |
300 |
3.2 |
ND |
|
E. coli |
400 |
400 |
300 |
300 |
8.3 |
9.2 |
|
K. pneumoniae |
400 |
400 |
ND |
300 |
100 |
ND |
|
S. typhi |
400 |
400 |
ND |
ND |
ND |
ND |
|
C. albicans |
500 |
500 |
ND |
ND |
ND |
90 |
|
ND-Not detected.
Table 4. The brine-shrimp lethality
assay of the crude ethanolic extracts of leaves and stem of Calotropis
procera
Sample |
(Dead average) |
10mg/ml
|
LD50(ppm)
|
1000 mg/ml
|
100 mg/ml
|
|
A |
10 |
8.3 |
6.3 |
192 |
B |
10 |
8.7 |
7.0 |
182 |
Myrsine Africana (root ethanolic extract) |
114 |
Pogonopus specious s (dry sap) |
50 |
Persia majo r(extract of bark) |
2.60 |
Expectedly,
the fractions afforded greater antibacterial activity against the test
organisms than the activity given by their respective mother extracts (Table
2).This could be attributed to level of purity inherent in the fractions.
It
was observed that among the fractions, the ethylacetate fractions gave the
highest antibacterial activity while the chloroform fractions recorded the
least. This was so because the extracts were largely insoluble in chloroform,
thereby affording insoluble fractions which gave comparably smaller
antibacterial activity.(Table 2).
However,
the crude ethanolic extracts and the fractions demonstrated poor anti-fungal
activity against C.albicans. This could be due to the nature of the
fungus; its structure differing from the cell-wall of bacteria and resembling
those of higher plants, hence limiting the permeation of substances into it.
The
results of the M.I.C. determinations as presented on Table 3 generally show
that higher concentrations of the extracts were required it inhibit the growth
of the microbes than those required of the fractions. The same reason of level
of purity applies.
The brine-shrimp assay determines the lethalities of
materials toward brine-shrimp larvae (nauplii) and in doing so predicts the
ability to kill cancer cells in cell-cultures, kill various pests and exert a
wide range of pharmacologic effects. The shrimp nauplii have been used for a number
of bioassay systems in which natural products extracts, fractions or pure
isolates are tested at concentration of 1000mg/ml,100mg/ml and 10mg/ml in vials containing 5ml of brine and ten nauplii
in each of the three replicates (Meyer et al,1982).The LD50 values
in p.p.m. are estimated with 95% confidence using the appropriate mathematical
estimates; the Finney probit analysis program being the model routinely
employed.
The
LD50 values of the crude ethanolic extracts of leaves and stem of C.procera
and other plants in literature (Kupahan et al, 1969; Ma et al
1989; Ma et al 1990; McLauglin et al,1991) are presented on Table
4.The results show that both extracts(leaves and stem) C. procera
displayed LD50 values of 192ppm and 182ppm. These values compare favorably
with those of Myrsine Africana (114ppm), Pogonopus speciosus (50ppm)
and Persia major (2.6ppm) whose LD50 values below the 200ppm
are generally considered as significant((Kupahan et al,1969; Ma et
al,1989;Ma et al,1990;McLauglin et al,1991; Oladimeji et
al, 2005).This is to be expected because the crude ethanolic of the leaves
and stem tested positive for saponins (Table 1).This class of metabolites had
been implicated in previous studies to be cytotoxic (Kupahan et al,1969).
These particular results obtained in this study have revealed a novel potential
of the plant in the fight against tumors in man.
REFERENCES
- Banerji
S, Bhowmick S, Bera M, Pal M, Pal SP (1991): Antinociceptive action of GABA-mimetic agent-N-Phthaloyl GABA. Indian.
J Exp Biol 6:538-542.
- Banierji
S, Habibuddin M, Pal SP (1992): Antiulcer and gastric secretory activity of N-Phthaloyl gamma-aminobutyric
acid. Eur J Pharmacol 25: 211-215.
- Baran
D, Panduraru I, Saramet A, Petrescu E, Haulica I (2000): Influence of light-dark cycle alteration on free
radical in rat CNS. Rom J Physiol 37: 23-38.
- Baydas
G, Gursu MF, Yilmaz S, Cannoplat S, Yasar A, Cilkim G, Canatan H (2002): Daily rhythm of glutathione peroxidase activity,
lipid peroxidation and glutathione levels in tissues of pinealoctomized rats. Neurosci
Lett 323: 195-198.
- Bhowmick
S, Bose R, Pal M, Pal SP (1990): Antiulcer activity of N-Phthaloyl GABA-a new GABA mimetic agent. Ind J Exp
Biol 28: 190-192.
- Bhowmick
S, Pal M, Pal SP (1989): Synthesis
and anticonvulsant activity of N-Phthaloyl GABA-a new GABA derivative. Ind J
Exp Biol 27: 805-808.
- Decavel
C, Van den pol AN (1990): GABA a
dominant neurotransmitter in the hypothalamus. Journal of Comparative
Neurology 302: 1019-1037.
- Ellman
GL (1959): Tissue sulphydryl groups.
Arch. Biochem. Biophys. 82:70-77,
- Farooqui
MY, Ahmed AE (1984): Circadian
periodicity of tissue glutathione and its relationship with lipid peroxidation
in rats. Life Sci 34: 2413-2418.
- Habibuddin
M, Pal M, Pal SP (1982): Neuropharmacology of amide derivatives of P-GABA. Ind J Exp Biol 30:
578-582.
- Hendrickson AE, Ogren MP, Vaughan JE, Barber RP, Wu JY
(1983): Light and electron microscope
immunocytochemical localization of glutamic acid decarboxylase in monkey
geniculate complex: Evidence for GABAergic neurons and synapses. J Neurosci
3: 1245-1262.
- Hodoglugil
U, Ongun O, Guney Z, Altan N, Zengil H (1995): Temporal variation in hepatic superoxide dismutase
activity in mice. Chronobiol Int 12: 152-155.
- Kakkar
P, Dos B, Viswanathan PN (1984): A
modified spectrophotometric assay of superoxide dismutase. Ind J Biochem
Biophys 21: 130-132.
- Kulkarni
SK, Kunchandy J (1998): In brain and
psychophysiology of stress, edited by K.N Sharma, W Selvamurthy and V
Bhattacharya (Indian Council of Medical Research, New Delhi) 191.
- Lowe
IP, Robins E, Eyerman GS (1958): Determination of brain GABA level by spectrofluorimetry. J Neurochem 3:
8.
- Manivasagam
T, Subramanian P (2004): Influence of
monosodium glutamate on circadian rhythms of lipid peroxidation products and
antioxidants in rats. The Italian J Pharmacol 53: 72-76.
- Mirunalani
S, Subrmanian P (2004): Temporal
oscillations of thyroid hormones in long term melatonin treated rats. Pharmazie
60: 52-56
- Moore
RY, Speh JC (1993): GABA is principal
neurotransmitters of the circadian system. Neurosci Lett 150: 112-116.
- Myers
RD (1975): Blood brain barrier
technique for the intracerebral administration of drugs. In: Iversen, L.L;
Iversen, S.D; Sryder, S.H., eds. Handbook of psychopharmacology, Vol.2.
New York: Plenum Press; 1-28.
- Nichans
WG, Samuelson B (1986): Formation of
malondialdehyde from phospholipid arachidonate during microsomal lipid
peroxidation. Eur J Biochem 6: 126-130.
- Rajakrishanan
V, Subramanian S, Viswanathan P, Menon VP (1999): Effects of chronic ethanol ingestion on Biochemical
circadian rhythms in Wistar rats. Alcohol 18: 147-152.
- Ralph
MR, Menaker M (1989): GABA regulation
of circadian responses to light. Involvement of GABA-benzodiazepine and GABAB
receptors. J Neurosci 9: 2858-2865.
- Reppert SM, Weaver DR
(2001): Molecular analysis of
mammalian circadian rhythms. Annu Rev Physiol 63: 647-678.
- Schibler
U, Ripperger J, Brown SA (2003): Peripheral circadian oscillations in mammals: time and food. J Biol Rhythms
18: 250-260.
- Sen
S, Habibuddin M, Pal SP (1994): Antinociaptive action and N-Octanoyl GABA-a new GABA mimetic agent. Ind J
Exp Biol 32: 718-723.
- Singh
JPV, Selvendiran K, Mumtaz Bansu S (2004): Protective role Apigenin on the status of lipid peroxidation and
antioxidant defense against hepatocarcinogenesis in Wistar albino rats. Phytomedicine
11: 309-393.
- Sinha
AK (1972): Colorimetric assay of
catalase. Anal Biochem 47: 389-384.
- Solar
P, Ahlers I (1997): Circadian
oscillations of lipid peroxidation in the rat pineal gland. Physiol Res 46:
323-325.
- Subramanian
P, Menon VP, Arockiam, FV, Rajakrishnan V, Balamurugan E (1998): Lithium modulates biochemical circadian rhythms in
Wistar rats. Choronobiol Int 15: 29-38.
- Subramanian
P, Subbaraj R (1993): Diazepam phase
shifts the circadian clock of the field mouse Musbooduga. J Biosci 18:
103-110.
- Subramanian
P, Sundaresan S, Balamurugan E (1998): Temporal
oscillations of phosphatases in N-Phthaloyl gamma-aminobutyric acid treated
rats. Ind J Exp Biol 36: 1141-1143.
- Subrmanian
P, Subbaraj R (1996): Diazepam
modulates the period of locomotor rhythm in mice (musbooduga) and
attenuates light-induced phase advances. Pharmacol Biochem Behav 54:
393-398.
- Turek
FW, Losee-Olson SH (1987): Dose
response curve for the phase shifting effect of triazolam on the mammalian
circadian clock. Life Sci 40: 1033-1038.
- Wagner
S, Castel M, Gainer H, Yarom Y (1997): GABA
in the mammalian suprachiasmatic nucleus and its role in diurnal rhythmicity. Nature
387: 598-603.
- Wu
JY, Brandon C, Su YYT, Lam DMK (1981): Immunocytochemical
and autoradiographic localization on GABA system in the vertebrate retina. Mol
Cell Biochem 39: 229-238.
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