Title: Value addition of cotton stalks through enzymatic production of xylooligosaccharides

Authors: Ashis Kumar Samanta; Jayaram Chikkerur; Sohini Roy; Atul Purushottam Kolte; Arindam Dhali; Kandalam Giridhar; Manpal Sridhar; Swaraj Senani

Addresses: ICAR-National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bengaluru, 56 0030, Karnataka, India; SAARC Agriculture Centre, BARC Complex, Farmgate, Dhaka – 1215, Bangladesh ' Jain University, JGI Global Campus, Jakkasandra, Kanakpura, Ramnagara District, Karnataka 562112, India ' Jain University, JGI Global Campus, Jakkasandra, Kanakpura, Ramnagara District, Karnataka 562112, India ' Jain University, JGI Global Campus, Jakkasandra, Kanakpura, Ramnagara District, Karnataka 562112, India ' ICAR-National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bengaluru, 56 0030, Karnataka, India ' ICAR-National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bengaluru, 56 0030, Karnataka, India ' ICAR-National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bengaluru, 56 0030, Karnataka, India ' ICAR-National Institute of Animal Nutrition and Physiology, Hosur Road, Adugodi, Bengaluru, 56 0030, Karnataka, India

Abstract: The present work focuses on the value addition of cotton stalks through xylan extraction and enzymatic production of xylooligosaccharides (XOS); a pentose based prebiotic. Chemical analysis revealed that cotton stalk contains neutral detergent fibre 87.66%, acid detergent fibre 72.81%, hemicellulose 14.85%, cellulose 53.08%, and acid detergent lignin 19.73%. The xylan yield from cotton stalks was ranged from 1.75 to 7.36% when recovered with lithium hydroxide, while it reached up to 14% by using sodium and potassium hydroxides. The maximum recovery of xylan was attained at 4% NaOH together with steam and 8% KOH under overnight incubation. Commercial xylanase enzyme was used for enzymatic hydrolysis of xylan to produce XOS. The XOS concentration was ranged from 0.83 to maximum value of 2.19 mg/ml in the hydrolysate at pH 5.0, enzyme dose of 5 U, for 4 h of hydrolysis time. The findings substantiated the potentiality of cotton stalk as a raw material for xylan extraction vis a vis production of XOS.

Keywords: cotton stalk; enzymatic process; xylan; xylooligosaccharides; XOS.

DOI: 10.1504/IJEWM.2020.104344

International Journal of Environment and Waste Management, 2020 Vol.25 No.1, pp.1 - 11

Received: 09 Jun 2018
Accepted: 29 Dec 2018

Published online: 26 Dec 2019 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article