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Research Journal of Medicinal Plants
  Year: 2008 | Volume: 2 | Issue: 1 | Page No.: 48-52
DOI: 10.3923/rjmp.2008.48.52
 
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A Study of the Seasonal Variation in the Antimicrobial Constituents of the Leaves of Loranthus micranthus Sourced from Percia americana

P.O. Osadebe, C.A. Dieke and F.B.C. Okoye

Abstract:
A comparative study of the antimicrobial constituents of the leaves of Loranthus micranthus (parasitic on Percia americana) harvested at different seasons of the year, namely, January, April, July and November, was carried out. The air-dried and pulverized leaves harvested at the stated periods were extracted with petroleum ether and the extract subjected to antimicrobial screening and phytochemical investigation. Using various solvent treatments the powdered leaves harvested in April was fractionated into four fractions, A, B, C and D; each fraction was screened for antimicrobial activity and phytochemical constituents. Phytochemical analysis of the extracts showed presence of tannins, flavonoids, alkaloids, terpenoids and saponins with some of these constituents showing variations across the seasons. Broad spectrum antibacterial activity was observed for all the extracts. However, the activity against Bacillus subtillis and Salmonella kapemba was significantly (p< 0.001) lower for the extracts of the leaves harvested in January when compared with the extracts of the leaves harvested in the other months. Only the extracts of the leaves harvested in April showed antifungal activity. Fractions A, B and D showed antimicrobial activity comparable (p< 0.05) to standard antibiotic, chloramphenicol. Fraction A is rich in alkaloids, B in terpenoids, A and D in tannins. The presence of alkaloids only in April and July may explain the higher antimicrobial activity observed in these months. In conclusion, mistletoe used for herbal remedy of nonspecific infections may be preferentially harvested in April and July.
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How to cite this article:

P.O. Osadebe, C.A. Dieke and F.B.C. Okoye, 2008. A Study of the Seasonal Variation in the Antimicrobial Constituents of the Leaves of Loranthus micranthus Sourced from Percia americana. Research Journal of Medicinal Plants, 2: 48-52.

DOI: 10.3923/rjmp.2008.48.52

URL: https://scialert.net/abstract/?doi=rjmp.2008.48.52

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