Utility of starchy, lignocellulosics and cellulosics hydrolysates on cellulase production under liquid state fermentation

Abstract

Starch is one of the most abundant renewable carbohydrate reserves of higher plants. It can be used to produce many valuable food products in the food processing industry. Furthermore, starch is also used as an important feedstock in the fermentation industry to produce value-added products. Lignocellulosic materials such as agriculture and forestry wastes are considered as a renewable feedstock for bioenergy production through a biochemical conversion process. Converting lignocellulosic biomass into fuels and chemicals entail a physicochemical pretreatment of the biomass, followed by enzymatic hydrolysis of the polysaccharide components such as cellulose and hemicellulose into monomeric sugars. These sugars can then be further fermented into other desired compounds of interest. During the deconstruction processes, various inhibitory compounds are released due to the partial over-degradation of lignocellulose biomass, which inhibits the cell growth and metabolic capacity of fermenting strains. Cellulosic materials such as waste paper in large quantities can also be used as potentially cheap feedstock for sustainable production of value-added products. The present investigation is mainly focused on the utility of starchy hydrolysates (wheat, potato, and rice) and lignocellulosics hydrolysates (bagasse and wheat straw) in cellulase production under liquid state fermentation. It also depicts the potential of cellulosic hydrolysate (waste newspaper) in product formation.

Bioprocess development for Extraction and purification of cellulases from Aspergillus niger 3ASZ using statistical experimental design techniques

“…Carvalho et al [29] described that the incubation time resulted in a high income of cellulase by Aspergillus niger, which was also in contrast with the results of the current study that showed that incubation time was a nonsigni cant factor in enzyme productivity. Similarly, Verma et al [34] reported that soluble starch increased the enzyme yield. Wu et al [35] found that MgSO 4 , K2HPO 4 , and peptone increased enzyme activity, contrary to the current ndings.…”