Growth kinetic profiles of Aspergillus niger S14 a mangrove isolate andudAspergillus oryzae NCIM 1212 in solid state fermentation

摘要

Aspergillus niger is one among the many species of fungi thriving in mangrove ecosystem with potential for biotechnologicaludand industrial applications. Understanding the growth profile and kinetics is of use in studying dynamics of mangroveudecosystem. In the present investigations, empirical equations and growth models commonly used in elucidating the dynamicudnature of growth were fitted to the data of the biomass, protein and glucosamine levels during solid state fermentation (SSF)udwith wheat bran as substrate using Aspergillus niger S14, a fungal isolate from mangrove and Aspergillus oryzae NCIMud1212, an industrial strain. Linear, exponential, two-phase models, logistic equations, Richards, Michaelis-Menten, Weibull,udModified Gompertz and Morgan-Mercer-Flodin models were used. Among the models, logistic equation and Michaelis-udMenten model could provide an adequate fit to the biomass variation for 21 days. The protein and glucosamine contentsudfollowed a different trend compared to the direct biomass measurements which made them inept for growth kinetic studiesudof the two fungal strains in SSF.