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High-fructose corn syrup production and its new applications for 5-hydroxymethylfurfural and value-added furan derivatives:Promises and challenges

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Journal of Bioresources and Bioproducts 2022年第3期7卷 148-160页

作者： Aristide Laurel Mokale Kognou sarita shrestha Zihua Jiang Chunbao(Charles)Xu Fubao Sun Wensheng Qin Department of Biology Lakehead UniversityThunder Bay P7B 5E1Canada Department of Chemistry Lakehead UniversityThunder Bay P7B 5E1Canada Department of Chemical and Biochemical Engineering Western UniversityLondon N6A 5B9Canada School of Biotechnology Jiangnan UniversityWuxi 214122China

High fructose corn syrup has been industrially produced by converting glucose to fructose by glucose isomerases,tetrameric metalloenzymes widely used in industrial *** in enzyme engineering and commercial production of glucose isomerase have paved the way to explore more efficient variants of these *** 5-hydroxymethylfurfural can be produced from high fructose corn syrup catalytic dehydration,and it can be further converted into various furanic compounds chemically or biologically for various industrial applications as a promising platform *** the chemical conversion of 5-hydroxymethylfurfural into furanic compounds has been extensively investigated in recent years,bioconversion has shown promise for its mild conditions due to the harsh chemical reaction *** review discusses pro-tein engineering potential for improving glucose isomerase production and recent advancements in bioconversion of 5-hydroxymethylfurfural into value-added furanic *** suggests bi-ological strategies for the industrial transformation of 5-hydroxymethylfurfural.

关键词： High fructose corn syrup Glucose isomerase Rational enzyme engineering Directed evolution Furanic derivatives Biocatalysts

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Characterization of glucose isomerase-producing bacteria and optimization of fermentation conditions for producing glucose isomerase using biomass

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Green Chemical Engineering 2023年第2期4卷 239-249页

作者： Aristide Laurel Mokale Kognou Chonlong Chio Janak Raj Khatiwada sarita shrestha Xuantong Chen Hongwei Li Yuen Zhu Zi-Hua Jiang Chunbao(Charles)Xu Wensheng Qin Department of Biology Lakehead UniversityThunder BayONP7B 5E1Canada Department of Chemical and Biochemical Engineering Western UniversityLondonONN6A 5B9Canada School of Environment and Resources Shanxi UniversityTaiyuan030006China Department of Chemistry Lakehead UniversityThunder BayONP7B 5E1Canada

Glucose isomerase(GI)is an enzyme with high potential *** of GI producing bacteria with interesting properties from an industrial point of view is *** sp.,Paenarthrobacter sp.,Chryseobacterium sp.,Hymenobacter sp.,Mycobacterium sp.,and Stenotrophomonas *** isolated from soil *** of enzyme production yield was investigated in various fermentation conditions using response surface *** isolates exhibited maximum GI activity at 40℃,pH 6–8 after 4 days of incubation.A mixture of peptone/yeast extract or tryptone/peptone enhanced higher enzyme *** same trend was observed in fermentation medium containing 1%xylose or 2%–2.5%wheat *** study advanced the knowledge of these bacterial isolates in promoting wheat straw as feedstock for the bio-based industry.

关键词： Cellulolytic bacteria Glucose/xylose isomerase 16S rRNA Biomass conversion

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Physico-Chemical and Oxygen-Hydrogen Isotopic Assessment of Bagmati and Bishnumati Rivers and the Shallow Groundwater along the River Corridors in Kathmandu Valley, Nepal

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Journal of Water Resource and Protection 2015年第17期7卷 1435-1448页

作者： Rabin Malla sarita shrestha Saroj K. Chapagain Maneesha Shakya Takashi Nakamura Center of Research for Environment Energy and Water (CREEW) Kathmandu Nepal Environmental Engineering and Management Asian Institute of Technology Klong Luang Thailand Interdisciplinary Centre for River Basin Environment (ICRE) University of Yamanashi Kofu Japan

The direct dumping of solid wastes into the rivers, discharge of industrial effluents together with direct discharge of domestic sewage have excessively polluted the major rivers Bagmati and Bish-numati. Groundwater along these river corridors is also affected from pollution of these rivers. Two major rivers: Bagmati and Bishnumati and shallow tube wells adjacent to these rivers were monitored for 2 years. Samples were analysed for the stable isotopes of hydrogen and oxygen (δD and δ18O) and selected physico-chemical parameters to investigate the possible interrelationship between river water and shallow groundwater along these river corridors. The physico-chemical values revealed that shallow groundwater and river water along the Bishnumati River corridor were heavily mineralized due to direct discharge of sewage wastes into this river. The isotope compositions of river water and shallow groundwater clustered together revealed possible interrelationship between them. Some of the isotopic compositions of groundwater and river water deviated below the Local Meteoric Water Line (LMWL) indicating that the water has undergone evaporation. The isotopic and chemical results suggested possible interrelationship between river water and groundwater. Fractional contribution of the river water to groundwater was calculated based on isotopic data using mass balance approach. Results showed that shallow groundwater SG1, along the Bagmati River corridor (in September 2013), was composed of approximately 30% - 40% Bagmati River water. Similarly, shallow groundwater SG5 of Bishnumati River corridor (in September 2013), was composed of approximately 45% - 50% river water. This result indicated that high portion of river water mixed-up with adjoining shallow groundwater along the river corridors. Further, the mix-up of the river water with groundwater can be harmful when rivers are polluted. These findings can be useful for a better understanding of hydrogeological processes at the r

关键词： Bagmati River Bishnumati River Groundwater Interrelationship Kathmandu Valley Stable Isotopes

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