@article { ISI:000313651700018,
	title = {Combinatorial approach of statistical optimization and mutagenesis for improved production of acidic phytase by Aspergillus niger NCIM 563 under submerged fermentation condition},
	journal = {Applied Microbiology and Biotechnology},
	volume = {97},
	number = {2},
	year = {2013},
	month = {JAN},
	pages = {673-679},
	publisher = {SPRINGER},
	address = {233 SPRING ST, NEW YORK, NY 10013 USA},
	abstract = {<p>Combination of statistical optimization and mutagenesis to isolate hypersecretory strains is studied to maximize phytase production from Aspergillus niger NCIM 563 under submerged fermentation. The overall results obtained show a remarkable 5.98-fold improvement in phytase production rates when compared to that using basal medium. Optimization of culture conditions from parent strain is studied first by the Plackett-Burman technique to evaluate the effects of 11 variables for phytase production. The results showed that glucose, MgSO4, KCl, incubation period, and MnSO4 are the most significant variables affecting enzyme production. Further optimization in these variables, using a central composite design technique, resulted in 3.74-fold increase in the yield of phytase production to 254,500 U/l when compared with the activity observed with basal media (68,000 U/l) in shake flask. Our experiments show that the phytase from A. niger NCIM 563 exhibits desirable activity in simulated gastric fluid conditions with low pH and also improved thermostability when compared to commercial phytase. The improved yield demonstrates the potential applicability of phytase enzyme as a source of phytase supplement for phosphorus nutrition and environmental protection in animal feed industry. Physical and chemical mutagenesis experiments were carried out in parallel to isolate hypersecretory mutants that could possibly further enhance the enzyme production. Using optimized media conditions of the parent strain, our results show that mutant strain A. niger NCIM 1359 increased the phytase activity by another 1.6-fold to 407,200 U/l.</p>},
	keywords = {Animal feed, Aspergillus niger, Mutagenesis, Phytase, Statistical optimization},
	issn = {0175-7598},
	doi = {10.1007/s00253-012-3965-8},
	author = {Bhavsar, Kavita P. and Gujar, P. and Shah, P. and Kumar, V. Ravi and Khire, Jayant Malhar}
}
@article {49541,
	title = {Aspergillus terreus variant TB21 wet biomass optimized by in-situ transesterification for biodiesel production},
	journal = {AMB Express},
	volume = {15},
	year = {2025},
	month = {FEB},
	pages = {23},
	type = {Article},
	abstract = {<p>
	The oleaginous fungus, Aspergillus terreus when subjected to random chemical mutagenesis led to isolation of TB21 variant with improved lipid content (78.1\%) as compared to wild type (49.8\%). The fungal wet biomass grown on sugarcane bagasse hydrolysate (SCBH) was subjected to one-step in-situ (direct) acid transesterification to optimize its conversion to biodiesel using a 2-level factorial statistical design of experiments. The process optimization revealed that wet biomass and methanol were the most significant factors and in a short reaction time period of 5 min with low methanol: wet biomass ratio (10:1) influenced FAME production Statistical optimization studies showed that TB21 exhibited a higher FAME content of 76.5 and 38.1\% (w/w) from wet and dry biomass, respectively when compared to wild type (48.1 and 24.5\%). FAME productivity (0.55-1 h-1) and a yield (66 gL-1) were achieved when TB21 was grown on SCBH for 120 h at 30 degrees C. The FAME profile from the wet biomass of TB21 grown on SCBH had desirable amounts of saturated (77.7\%), monounsaturated (7.2\%), and polyunsaturated (2.4\%) methyl esters. Physico-chemical properties of TB21-derived biodiesel were determined, namely, density(0.88 g cm-3), kinematic viscosity (4.1 mm s-2), iodine value (96.82), cetane number (55.31), free fatty acid content (0.15\%), total acid number (0.3 NaOH mg g-1), meeting international (ASTM D6751, EN 14214) and Indian (IS 15607) standards. Thus, the direct one-pot in situ transesterification reaction using wet biomass of variant TB21 strain showed improved production and quality of biodiesel with potential large scale application using the low-cost substrate (SCBH).</p>
},
	keywords = {Aspergillus Terreus, Biodiesel, In situ transesterification, Mutant, Statistical optimization, Wet biomass},
	issn = {2191-0855},
	doi = {10.1186/s13568-024-01772-7},
	author = {Bed, Rashmi K. and Kumar, V. Ravi and RaviKumar, Ameeta}
}
