Enhanced biogas production from food waste and activated sludge using advanced techniques - A review.

The potential of cellulolytic enzymes has been widely studied and explored for bioconversion processes and plays a key role in various industrial applications. Cellulase, a key enzyme for cellulose-rich waste feedstock-based biorefinery, has increasing demand in various industries, e.g., paper and pulp, juice clarification, etc. Also, there has been constant progress in developing new strategies to enhance its production, such as the application of waste feedstock as the substrate for the production of individual or enzyme cocktails, process parameters control, and genetic manipulations for enzyme production with enhanced yield, efficiency, and specificity. Further, an insight into immobilization techniques has also been presented for improved reusability of cellulase, a critical factor that controls the cost of the enzyme at an industrial scale. In addition, the review also gives an insight into the status of the significant application of cellulase in the industrial sector, with its techno-economic analysis for future applications. The present review gives a complete overview of current perspectives on the production of microbial cellulases as a promising tool to develop a sustainable and greener concept for industrial applications.

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Current perspective on production and applications of microbial cellulases: a review

Biotechnological production and high potential of furan-based renewable monomers and polymers.

Catalytic conversion of corncob to furfuryl alcohol in tandem reaction with tin-loaded sulfonated zeolite and NADPH-dependent reductase biocatalyst.

Biobased furans, such as furfural, 5-hydroxymethylfurfural, and 2,5-furandicarboxylic acid, are recognized as the top-value platform chemicals in the valorization of biomass to chemicals, fuels, and materials. Biocatalysis has emerged as a promising technique in the chemical and pharmaceutical industries because of exquisite selectivity, mild reaction conditions, environmental friendliness, etc. In this comprehensive review, we summarize the recent advances in (chemo)biocatalytic conversion of biobased furans, based on the reaction types including oxidation, reduction, C–C and C–N bonds formation, esterification, and amidation. Particularly, the biocatalysts and their catalytic mechanisms/pathways are critically discussed to allow the rational design and construction of efficient enzymes/multienzyme systems/chemobiocatalytic systems. Besides, various biocatalyst engineering and reaction engineering strategies are highlighted to intensify the processes. Future research directions are proposed to expand the chemical space of furans as well as to improve the commercial acceptance of biocatalytic processes. 

(Chemo)biocatalytic Upgrading of Biobased Furanic Platforms to Chemicals, Fuels, and Materials: A Comprehensive Review

Improved biosynthesis of 5-hydroxymethyl-2-furancarboxylic acid and furoic acid from biomass-derived furans with high substrate tolerance of recombinant Escherichia coli HMFOMUT whole-cells.

Genetic manipulation strategies for ethanol production from bioconversion of lignocellulose waste.

Tandem integration of aerobic fungal cellulase production, lignocellulose substrate saccharification and anaerobic ethanol fermentation by a modified gas lift bioreactor

Presently, fossil fuels are extensively employed as major sources of energy, and their uses are considered unsustainable due to emissions of obnoxious gases on the burning of fossil fuels, which can lead to severe environmental complications, including human health. To tackle these issues, various processes are developing to waste as a feed to generate eco-friendly fuels. The biological production of fuels is considered to be more beneficial than physicochemical methods due to their environmentally friendly nature, high rate of conversion at ambient physiological conditions, and less energy-intensive. Among various biofuels, hydrogen (H2) is considered as a wonderful due to high calorific value and generate water molecule as end product on the burning. The H2 production from biowaste is demonstrated, and agri-food waste can be potentially used as a feedstock due to their high biodegradability over lignocellulosic-based biomass. Still, the H2 production is uneconomical from biowaste in fuel competing market because of low yields and increased capital and operational expenses. Anaerobic digestion is widely used for waste management and the generation of value-added products. This article is highlighting the valorization of agri-food waste to biofuels in single (H2) and two-stage bioprocesses of H2 and CH4 production.

Anaerobic Digestion of Agri-Food Wastes for Generating Biofuels.

The green synthesis of the flavor esters, n-propyl acetate, isobutyl acetate and isoamyl acetate had the advantages over the chemical synthesis. The esterase from Candida parapsilosis could transform n-propanol, isobutanol and isoamyl alcohol into n-propyl acetate, isobutyl acetate and isoamyl acetate, respectively. The esterase was expressed in Saccharomyces cerevisiae. At 30 °C for 1 d, the concentration of n-propyl acetate, isobutyl acetate and isoamyl acetate synthesized by the esterase expressed in Saccharomyces cerevisiae was 24.6 mg/100 mL, 8.3 mg/100 mL, 5.6 mg/100 mL, respectively. Expression of the esterase has a practical significance for flavor ester synthesis by green biochemical process.

Chunjie Gong

Papers

Improved biosynthesis of 5-hydroxymethyl-2-furancarboxylic acid and furoic acid from biomass-derived furans with high substrate tolerance of recombinant Escherichia coli HMFOMUT whole-cells.

Genetic manipulation strategies for ethanol production from bioconversion of lignocellulose waste.

Tandem integration of aerobic fungal cellulase production, lignocellulose substrate saccharification and anaerobic ethanol fermentation by a modified gas lift bioreactor

Anaerobic Digestion of Agri-Food Wastes for Generating Biofuels.

Green Synthesis of the Flavor Esters with a Marine Candida parapsilosis Esterase Expressed in Saccharomyces cerevisiae.