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Articles by A.N.M. Mamun-Or-Rashid
Total Records ( 2 ) for A.N.M. Mamun-Or-Rashid
  A.N.M. Mamun-Or-Rashid , Biplab Kumar Dash , Md. Nurul Abadin Chowdhury , Momtaz Fatima Waheed and Md. Kamruzzaman Pramanik
  The present study was carried out to explore baker’s yeasts strains from sugarcane juice to assess its potential in laboratory scale production of breads. Collected juice samples were processed for isolation and identification of yeast strains based on standard cultural, morphological and biochemical characteristics. Among the six isolated strains, four (designated as S1, S2, S5 and S6) were identified as Saccharomyces cerevisiae and the rests (designated S3 and S4) were as S. rouxii. When assessing their CO2 production rates as a measure of their baking potential, S6 was found to produce maximum amount of gas (226.67 mm3 mL-1) in sucrose broth, whereas gas produced by S2, S1 and S5 were relatively insignificant (170, 136.67 and 86.67 mm3 mL-1, respectively). No strain was found to produce undesirable H2S gas responsible for off-flavor. Besides, effects of different physicochemical parameters (e.g., pH, temperature, substrate concentration, incubation period, agitation etc.) on the production of yeast cell-mass were studied. Yield of cell mass was indirectly measured by spectrophotometric method at 550 nm. All the test isolates were found to produce maximum cell mass at a pH range of 4.0 to 5.0 in 2 to 4% molasses broth at 30°C after 4 days of incubation. In the laboratory scale production of bread using composite flour, Isolate-S6 formed significant characteristic texture. Considering overall characteristics, Isolate- S6 was found to be satisfactorily potent for baking purpose.
  A.N.M. Mamun-or-Rashid , Md. Rezuanul Islam and Biplab Kumar Dash
  Extracts in organic solvents (namely petroleum sprit, dichloromethane, ethyl acetate and methanol) of one of the important medicinal plants- Lippia alba were evaluated for their antibacterial activities against five pathogenic bacteria such as Bacillus subtilis, Sarcina lutea, Xanthomonas campestris, Escherichia coli and Klebsiella pneumoniae by estimating zones of inhibition as produced by disc-diffusion method on Nutrient agar medium. All the bacteria showed susceptibility against the petroleum sprit and ethyl acetate extracts, whereas, the dichloromethane and methanol extract showed least activities. It was found that antibacterial activity of the petroleum sprit extract showed maximum zone of inhibition against S. lutea (22 mm) followed by X. campestris (14 mm) B. subtilis (12 mm) and E. coli (12 mm). Ethyl acetate extracts showed highest activity 12 mm zone of inhibition against both S. lutea and X. campestris. The minimum inhibitory concentration of petroleum sprit and ethyl acetate extracts were ranged between 32-256 μg mL-1 for tested bacteria. This study demonstrates the potential of Lippia alba as a source of antibacterial agent that could be effectively used for future health care purposes.
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