title: Production of chitin deacetylase by Aspergillus flavus in submerged conditions.
abstract: Chitosan is a biopolymer obtained by deacetylation of chitin and has been proven to have various applications in industry and biomedicine. Deacetylation of chitin using the enzyme chitin deacetylase (CDA) is favorable in comparison to the hazardous chemical method involving strong alkali and high temperature. A fungal strain producing CDA was isolated from environmental samples collected from coastal regions of South Kerala, India. It was identified as Aspergillus flavus by morphological characteristics and ITS DNA analysis. Nutritional requirement for maximum production of CDA under submerged condition was optimized using statistical methods including Plackett-Burman and response surface methodology central composite design. A 5.98-fold enhancement in CDA production was attained in shake flasks when the fermentation process parameters were used at their optimum levels. The highest CDA activity was 57.69 ± 1.68 U under optimized bioprocess conditions that included 30 g L(-1) glucose, 40 g L(-1) yeast extract, 15 g L(-1) peptone, and 7 g L(-1) MgCl2 at initial media pH of 7 and incubation temperature of 32°C after 48 hr of incubation, while the unoptimized basal medium yielded 9.64 ± 2.04 U.
authors.affiliation: a CSIR-National Institute for Interdisciplinary Science and Technology , Thiruvanathapuram , Kerala , India.
authors.forename: Karthik
authors.initials: K
authors.lastname: Narayanan
authors.affiliation: a CSIR-National Institute for Interdisciplinary Science and Technology , Thiruvanathapuram , Kerala , India.
authors.forename: Binod
authors.initials: B
authors.lastname: Parameswaran
authors.affiliation: a CSIR-National Institute for Interdisciplinary Science and Technology , Thiruvanathapuram , Kerala , India.
authors.forename: Ashok
authors.initials: A
authors.lastname: Pandey
mesh_terms: D000581:Amidohydrolases / Q000096:biosynthesis*; D001231:Aspergillus flavus / Q000145:classification / Q000201:enzymology*; D003470:Culture Media; D066298:In Vitro Techniques; D010802:Phylogeny; D013499:Surface Properties
chemical_list: D003470:Culture Media; D000581:Amidohydrolases; C019866:chitin deacetylase
keywords: Aspergillus flavus; Plackett–Burman design; bioprocess optimization; central composite design; chitin deacetylase; microbial enzyme production