First ever report on the antimicrobial activities of some selected mangrove halophytes of Sundarban against milk spoilage microflora

Resumo

The study was governed by the objective of investigating
the antimicrobial effects of mangrove leaf extracts. The fresh and
dried leaf extracts from Avicennia marina (Forssk.) Vierh.,
Avicennia officinalis L., Aegiceras corniculatum (L.) Blanco,
Aegialitis rotundifolia Roxb., Acanthus ilicifolius L, Lumnitzera
racemosa Willd., Excoecaria agallocha L. and Sonneratia apetala
Buch-Ham. were found to have inhibitory effects on the milk
spoilage microflora obtained from curd sample. Methanol and
Acetone were used as extraction solvents and in comparison,
extracts by acetone were observed to suppress the microbial growth
to lesser extents. Leaf extracts of A. marina, A. officinalis L.
racemosa and A. rotundifolia were able to exert relatively greater
inhibitory effect on the milk spoilage microbial broth than others,
although all the species expressed some degree of suppression.
Interestingly A. rotundifolia, S. apetala, L. racemosa and
E. agallocha demonstrated greater efficiency in formation of larger
growth inhibition zones on the petri plates. The extracts obtained
from dry leaves produced greater adverse effects of the microbes
than the raw leaf extracts. The data generated were analyzed with the
help of ‘ANOVA: Single factor’ and ‘F-test: Two sample for
variance’ and data sets were of statistical significance at 0.05 level
of significance as null hypothesis was rejected.

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