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ISSN (Print): 2211-5501
ISSN (Online): 2211-551X

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Research Article

Statistical Approach to Enhance α-Amylase Production from Bacillus licheniformis and Purification of the Enzyme

Author(s): Kalpana Hiteshi and Reena Gupta*

Volume 11, Issue 1, 2022

Published on: 25 March, 2022

Page: [60 - 70] Pages: 11

DOI: 10.2174/2211550111666220204125406

Price: $65

Abstract

Background: The most widely used thermostable enzymes are the amylases in the starch industry. These are among the most important enzymes and are of great significance in present day biotechnology.

Objective: The main objective of the present study was to enhance α-amylase production from Bacillus licheniformis using Response Surface Methodology (RSM) and the purification of the enzyme to homogeneity.

Methods: Bacterial culture producing α-amylase isolated from hot spring (Himachal Pradesh) was identified as Bacillus licheniformis using 16S rDNA gene sequencing (NCBI Accession No.: KR340466). Medium components and physical culture parameters viz. pH, temperature, inoculum size, peptone concentration and starch concentration were optimized using RSM. Among these five factors, three factors (starch concentration, peptone concentration and inoculum size) had a positive effect on amylase production. A 4.09-fold increase in the production of α-amylase from B. licheniformis was achieved using RSM as compared to One Factor At a Time. The enzyme was purified by using Diethylaminoethyl Cellulose column chromatography and subsequently by Sephadex G-75 gel filtration chromatography.

Results: A purification fold of 23.39 and a yield of 12.12% were observed. A single band of 33 kDa was obtained using Sodium Dodecyl Sulphate (SDS) and native-Poly Acrylamide Gel Electrophoresis (PAGE), which indicated that the enzyme was purified to homogeneity and was a monomer. The enzyme showed stability at 50 and 65°C temperatures and at alkaline pH.

Conclusion: The stability of purified enzyme at high temperatures and alkaline pH suggested its wide application in textile, detergent and paper industries.

Keywords: Amylase, Bacillus licheniformis, RSM, SDS-PAGE, alkaliphilic, thermostable enzymes.

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