Enhanced production of xylanase by Fusarium sp. BVKT R2 and evaluation of its biomass saccharification efficiency

Abstract

Growth of sp. BVKT R2, a potential isolate of forest soils of Eastern Ghats on birchwood xylan in mineral salts medium (MSM) under un-optimized conditions of 30 °C, pH of 5.0, 150 rpm and inoculum size of 5 agar plugs for 7 days, yielded titer of 1290 U/mL of xylanase (EC 3.2.1.8). The effect of various operating parameters such as different substrates and their concentration, additional carbon and nitrogen sources, incubation temperature, initial pH, agitation and inoculum size on the production of xylanase by sp. BVKT R2 was studied in shake flask culture by one factor at a time approach. The same culture exhibited higher production of xylanase (4200 U/mL) when grown on birch wood xylan in MSM under optimized conditions with an additional carbon source-sorbitol (1.5%) nitrogen source-yeast extract (1.5%) temperature of 30 °C, pH of 5.0, agitation of 200 rpm and inoculum of 6 agar plugs for only 5 days. There was enhancement in xylanase production under optimized conditions by 3.2 folds over yields under un-optimized conditions. Growth of BVKT R2 culture on locally available lignocelluloses-sawdust, rice straw and cotton stalk-in MSM for 5 days released soluble sugars to the maximum extent of 52.76% with respect to sawdust indicating its greater importance in saccharification essential for biotechnological applications.

A detailed overview of xylanases: an emerging biomolecule for current and future prospective

“…The factor may be important physical or nutritional parameters regulating the growth of microorganisms and its enzyme yield. Ramanjaneyulu et al (2017) have evaluated several operating parameters for nutritional (different substrates and their concentrations, additional carbon and nitrogen sources) and physical factors (incubation temperature, pH, agitation) along with inoculum size of Fusarium sp. BVKT R2 in a shake flask culture (SmF) by OFAT approach.…”

“…Several reports suggest that xylanase obtained from several microorganisms plays an important role in saccharification of LCB for lignocellulosic-based biorefinery (Hu et al 2011;Choudhary et al 2014;Ramanjaneyulu et al 2017;Basit et al 2018). Hydrolysis and fermentation are important steps in biomass to bioethanol generation.…”