Abstract
Chitin is a linear homo-polymer of N-acetyl-d-glucosamine (GlcNAc) and the second most abundant biopolymer after cellulose. Several industries rely on the bioprocesses for waste chitin recycle and hydrolysis by chitinase (EC 3.2.1.14) for potential healthcare applications through the production of its monomeric subunit, GlcNAc. In the present study, a chitinase-producing fungus (named as MFSRK-S42) was isolated from the marine water sample of North Bay of the Andaman and Nicobar Islands. It was identified as Aspergillus terreus by morphological and molecular characterization methods leveraging the internal transcribed spacer between 18S rRNA and 5.8S rRNA. Chitinase that was isolated from the fermentation broth of marine Aspergillus terreus was used to carry out biotransformation of chitineaceous wastes. Prior to the enzymatic hydrolysis step, chitins from different sources were characterized for the presence of characteristic functional groups, grain size distribution, and surface morphology. Enzymatic hydrolysis of 50 mg/ml substrate with six units of enzyme incubated for 5 days revealed 15, 36.5, 40, and 46 mg/ml GlcNAc production from ground prawn shell, chitin flakes, colloidal prawn shell, and swollen chitin respectively under standardized conditions, as determined by HPLC. In this study, 30, 73, 80, and 92% GlcNAc yields were observed from ground prawn shell, chitin flakes, colloidal prawn shell, and swollen chitin conversion respectively. The HPLC-eluted product was confirmed as GlcNAc by the presence of characteristic functional groups in FTIR and 244 Da molecular weight peak in HRMS analyses.
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Acknowledgements
The authors gratefully acknowledge the technical help received from Dr. R. Samanta and Dr. D. Gunasheelan during HPLC analyses.
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SD is thankful to the National Jute Board (Govt. of India) and IIT Kharagpur for financial support.
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Das, S., Dey, P., Roy, D. et al. N-Acetyl-d-glucosamine Production by a Chitinase of Marine Fungal Origin: a Case Study of Potential Industrial Significance for Valorization of Waste Chitins. Appl Biochem Biotechnol 187, 407–423 (2019). https://doi.org/10.1007/s12010-018-2822-3
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DOI: https://doi.org/10.1007/s12010-018-2822-3