Enhanced degradation of alpha-chitin materials prepared from shrimp processing byproduct and production of N-acetyl-D-glucosamine by thermoactive chitinases from soil mesophilic fungi.

Suresh, P. V. and Anil Kumar, P. K. (2012) Enhanced degradation of alpha-chitin materials prepared from shrimp processing byproduct and production of N-acetyl-D-glucosamine by thermoactive chitinases from soil mesophilic fungi. Biodegradation, 23. pp. 597-607.

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Abstract

Soil isolates of mesophilic Penicillium monoverticillium CFR 2, Aspergillus flavus CFR 10 and Fusarium oxysporum CFR 8 were cultivated in solid state fermentation (SSF) using wheat bran solid medium supplemented with a-chitin in order to produce chitinolytic enzyme. Under SSF cultivation, maximum enzymes (U/g IDS) production was 41.0 (endo-chitinase) and 195.4 (b-N-acetylhexosaminidase) by P. monoverticillium, 26.8 (endo-chitinase) and 222.1 (b-N-acetylhexosaminidase) by A. flavus and 13.3 (endo-chitinase) and 168.3 (b-N-acetylhexosaminidase) by F. oxysporum after 166 h of incubation. The crude endo-chitinase and b-N-acetylhexosaminidase derived from A. flavus and F. oxysporum revealed optimum temperature at 62 ± 1�C, but the enzymes from P. monoverticillium showed optimum temperature at 52 ± 1�C for maximum activity. Several fold increase in endo-chitinase and b-Nacetylhexosaminidase activities in the crude enzymes preparation was achieved after concentrating with polyethylene glycol. The concentrated crude chitinases from P. monoverticillium, A. flavus and F. oxysporum, respectively yielded 95.6, 96.6 and 96.1 mmol/l of N-acetyl-D-glucosamine (GlcNAc) in 48 h of reaction from colloidal chitin. While, the crude enzyme preparations of P. monoverticillium, A. flavus and F. oxysporum produced 10.11, 6.85 and 10.7 mmol/l of GlcNAc respectively, in 48 h of reaction from crystalline a-chitin. HPLC analysis of colloidal chitin hydrolysates prepared with crude chitinases derived from P. monoverticillium, A. flavus and F. oxysporum revealed that the major reaction product was monomeric GlcNAc (*80%) and a small amount of (GlcNAc)4 (*20%), indicating the potential of these enzymes for efficient production of GlcNAc from a-chitin.

Item Type:	Article
Uncontrolled Keywords:	Soil fungi, Chitinases, Shrimp, byproduct, Chitin degradation N-acetyl-D-glucosamine
Subjects:	500 Natural Sciences and Mathematics > 07 Life Sciences > 03 Biochemistry & Molecular Biology > 04 Biosynthesis 600 Technology > 08 Food technology > 28 Meat, Fish & Poultry
Divisions:	Meat Fish and Poultry Technology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	27 Aug 2012 04:46
Last Modified:	17 Oct 2018 10:40
URI:	http://ir.cftri.res.in/id/eprint/10957

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