Anti-Bacterial Activity of Pigments Isolated From Pigment-Forming Soil Bacteria.
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Date
2014-04
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Abstract
Aims: Search for novel antimicrobials such as bacterial pigments is an issue of priority
now. This study aims to isolate pigments with anti-bacterial activity from soil bacteria.
Methodology: In this study, Pigment forming bacteria was isolated from soil samples
collected from different sites of Dhaka city and its adjoining areas. Colonies of various
colors such as yellow, golden yellow, red, pink, blue, green, purple and cream with both
diffusible and non-diffusible pigments were isolated in pure cultures on nutrient agar plus
2 percent glycerol at pH 7.2 and 37ºC. Anti-bacterial activity of the pigments extracted
from the bacteria were determined.
Results: 15 pigment forming bacteria was isolated from soil and identified to genus level
as Pseudomonas, Flavobacterium, chromobacterium, Xanthomonas, Aeromonas,
Escherichia and Bacillus. All the pigments showed to be broad spectrum in terms of
inhibitory activity against all the pathogens included in this study. Most of the pigments showed better anti-bacterial activity against gram-negative bacteria. Highest zone of
inhibition was resulted by pigment no 15 against Salmonella typhi and lowest zone of
inhibition was observed for pigment 13 against Staphylococcus aureus. Most of the
pigments except four (pigment no- 3, 10, 12, 15) were found to be bacteriostatic to the
test pathogens. MIC value of the pigments ranged from 1500-4000 μg/ml and most of the
pigments showed lower MIC value against gram-negative organisms.
Conclusion: On the basis of anti-bacterial activity and minimum inhibitory concentration
(MIC) pigment form Aeromonas (no- 6), Escherichia (no-10) and Pseudomonas (no-15)
can be selected as effective anti-bacterial agent. Further studies are needed to use these
pigments in food, cosmetic and textile industries.
Description
Keywords
Pigment, soil, bacteria, antibacterial activity
Citation
Rashid Md Mamunur, Md Fakruddin, Mazumdar Reaz Mohammad, Kaniz Fatema, Chowdhury Md Alimuddin. Anti-Bacterial Activity of Pigments Isolated From Pigment-Forming Soil Bacteria. British Journal of Pharmaceutical Research. 2014 Apr; 4(8): 880-894.