Article
Chemistry, Physical
Heshan Zheng, Yu Wang, Xiaochi Feng, Shuo Li, Yoong Kit Leong, Jo-Shu Chang
Summary: This paper reviews the recent progress in bio-hydrogen production from straw, focusing on the advancements in pretreatment and hydrolysis technologies. Various pretreatment procedures have been developed to enhance the availability of straw substrate for hydrogen-producing bacteria, enabling large-scale bio-hydrogen production. The challenges, prospects, and future directions of straw-based biohydrogen production are also discussed.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Do-Hyung Kim, Beom-Jung Kang, Sang-Hyoun Kim, Jeong-Hoon Park, Jeong-Jun Yoon
Summary: Adding magnetite (Fe3O4) can reduce the by-products generated from acid hydrolysis of biomass and enhance hydrogen production. This study extracted sugars from Gelidium amansii through acid hydrolysis and evaluated hydrogen production with magnetite supplementation. The addition of magnetite at a concentration of 1.3 g/L or lower increased hydrogen production by 11.4% on average, especially for the main by-product, 5-hydroxymethylfurfural (5-HMF). This strategy could optimize biohydrogen production using Gelidium amansii and reduce detoxification costs.
Article
Multidisciplinary Sciences
Zhiquan Wang, Suqing Wu, Chunzhen Fan, Xiangyong Zheng, Wei Zhang, Deyi Wu, Xinze Wang, Hainan Kong
Summary: The study found that the optimal NaOH pre-treatment conditions for enzymatic hydrolysis of wheat straw to enhance reducing sugar yield were NaOH concentration of 1.0%, solid content of 5.0%, and pre-treatment time of 60 minutes. Optimization of parameters such as solid content, enzyme loading, temperature, pH, and hydrolysis time during enzymatic hydrolysis can significantly increase the yield of reducing sugars.
SCIENTIFIC REPORTS
(2021)
Review
Chemistry, Applied
Chaozhong Xu, Shanshan Tong, Liqun Sun, Xiaoli Gu
Summary: Cellulase-mediated lignocellulosic biorefinery is crucial for producing high-value biofuels and chemicals, and immobilization of cellulase enzymes has greatly improved the efficiency, stability, and reusability of the process. This comprehensive review analyzes the principles and various approaches of cellulase immobilization, including physical adsorption, covalent binding, entrapment, and cross-linking. It also explores different carrier materials and emerging techniques such as multi-enzyme co-immobilization and 3D printing carriers, while addressing obstacles like diffusion limitations and loss of cellulase activity.
CARBOHYDRATE POLYMERS
(2023)
Article
Agricultural Engineering
Hong Liu, Zhiping Zhang, Chaoyang Lu, Jian Wang, Kaixin Wang, Siyi Guo, Quanguo Zhang
Summary: The method of enzymatic hydrolysis after alkaline pretreatment significantly improves the production efficiency of biohydrogen from microalgae biomass, providing scientific reference for the development of efficient and low-cost biohydrogen production technology.
BIORESOURCE TECHNOLOGY
(2022)
Review
Biotechnology & Applied Microbiology
Caio Cesar de Mello Capetti, Milena Moreira Vacilotto, Andrei Nicoli Gebieluca Dabul, Ana Gabriela Veiga Sepulchro, Vanessa Oliveira Arnoldi Pellegrini, Igor Polikarpov
Summary: The majority of lignocellulosic biomass originates from plant cell walls, which are complex structures built up mainly by cellulose, hemicellulose and lignin. Xylan, a major component of hemicellulose, can be efficiently degraded into XOS with various applications using enzymatic hydrolysis. Different xylanases from CAZy families can be used to cleave xylan and degrade it into short XOS with enhanced prebiotic effects for humans and animals. Recent advances in enzymatic production of XOS from lignocellulosic biomass and their potential health benefits are discussed in this review.
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Yingji Wu, Shengbo Ge, Changlei Xia, Changtong Mei, Ki-Hyun Kim, Liping Cai, Lee M. Smith, Jechan Lee, Sheldon Q. Shi
Summary: Intermittent ball milling was effective in enhancing enzymatic hydrolysis of dilute acid-pretreated lignocellulosic biomass, leading to higher glucose yield compared to typical hydrolysis. This technology shows promise for more efficient and environmentally friendly approaches to isolating glucose from lignocellulosic biomass.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Nejib Kasmi, Yosra Chebbi, Alessandra Lorenzetti, Minna Hakkarainen
Summary: Polyols made entirely from biomass play a significant role in producing greener polyurethanes. Researchers have developed highly transparent and malleable polyurethane thermosets using these biobased polyols, with easily adjustable properties for a wide range of applications.
Article
Mechanics
Adriana Gaona, Yuri Lawryshyn, Bradley A. Saville
Summary: This study introduces a novel CFD model that integrates biochemical reactions and mass transfer to investigate the complex HSEH process, showing significant effects of variations in chemical composition and solid loading on solid distribution.
Article
Agricultural Engineering
Chao Xu, Md. Asraful Alam, Zhongming Wang, Huanjun Chen, Jun Zhang, Shushi Huang, Wei Zhuang, Jingliang Xu
Summary: This study found that the cheap and biodegradable additives sophorolipid and whey protein can boost enzymatic hydrolysis of lignocellulosic biomass by alleviating non-productive adsorption and blocking enzyme adsorption sites. Additionally, these additives can reduce the inactivation rate of cellulase under high shear and temperature conditions.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Winfred-Peck Dorleku, Richard Bayitse, Anders Cai Holm Hansen, Firibu Kwasi Saalia, Anne-Belinda Bjerre
Summary: This study demonstrates that glucose can be efficiently produced from cassava peel without chemical or hydrothermal pretreatment. The conversion efficiency was optimized using mixed enzymes and response surface methodology. The empirical models developed provide an efficient tool for glucose recovery and have significance for large-scale industrial production.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Materials Science, Multidisciplinary
Li Xu, Aiting Zhang, Ruijie Liao, Yuxia Pang, Dongjie Yang, Hongming Lou, Xueqing Qiu
Summary: By synthesizing a cationic copolymer, cellulase adsorption onto lignin surface can be effectively obstructed, leading to enhanced glucose release. The copolymers show versatility in different enzyme preparations, acid-treated lignocellulosic substrates, and solid saccharification systems, while also achieving enzyme saving. Mechanistically, the copolymer attenuates irreversible binding between lignin and cellulase and exerts a positive influence on enzyme activity.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Agricultural Engineering
Patricia F. Avila, Rosana Goldbeck
Summary: This study improved cellulose recovery efficiency and reduced chemical consumption by performing prior delignification and alkaline treatment on sugarcane straw and coffee husk waste. Additionally, an effective approach for enzymatic production of short chain cello-oligosaccharides was explored using optimal mixture of commercial enzymes.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Agricultural Engineering
Guangyong Zeng, Liyi Zhang, Benkun Qi, Jianquan Luo, Yinhua Wan
Summary: Avicel cellulose was pretreated with two commonly used carboxylic acid-based deep eutectic solvents, choline chloride-lactic acid and choline chloride-formic acid. The pretreatment led to the formation of cellulose esters with lactic acid and formic acid, which was confirmed through spectroscopic analysis. Surprisingly, the esterified cellulose showed a significant decrease in enzymatic glucose yield compared to the untreated cellulose, but this reduction could be recovered by removing the ester groups through saponification. The decreased enzymatic cellulose hydrolysis may be attributed to changes in the interaction between the cellulose-binding domain of cellulase and the esterified cellulose.
BIORESOURCE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Caoxing Huang, Xiao Jiang, Xiaojun Shen, Jinguang Hu, Wei Tang, Xinxing Wu, Arthur Ragauskas, Hasan Jameel, Xianzhi Meng, Qiang Yong
Summary: Efficiently producing second-generation biofuels from biomass remains a long-term challenge due to biomass recalcitrance. Lignin significantly contributes to biomass recalcitrance by physically limiting enzyme access to carbohydrates. Research is focused on mitigating the negative effects of lignin on enzyme performance.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Masanobu Higashi, Itsuki Tanaka, Yutaka Amao, Tomoko Yoshida
Summary: This study investigated the fabrication of a stable CdS photoanode for CO2 reduction and demonstrated successful CO2 reduction using a CdS photoanode system under visible-light irradiation, along with the oxidation of [Fe(CN)(6)](4-).
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Yu Kita, Ritsuko Fujii, Yutaka Amao
Summary: This study has developed a new method for fixing CO2 to a biodegradable polymer monomer. By using biocatalysts AC and HBDH, as well as cell extract from Rhodobacter capsulatus, the one-pot synthesis of beta-hydroxybutyrate from CO2 and acetone has been achieved.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Physical
Mika Takeuchi, Yutaka Amao
Summary: This study developed a visible-light-driven method for producing fumarate from CO2 and pyruvate using renewable resources, which reduces dependence on fossil fuels and decreases CO2 emissions.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Multidisciplinary
Yu Kita, Yutaka Amao
Summary: A new method for the production of PHB precursor 3-hydroxybutyrate from CO2 and acetone using visible-light-driven catalytic system was investigated. This environmentally friendly approach can address plastic pollution and global warming. It was found that acetone can be efficiently converted into 3-hydroxybutyrate using 15% CO2 equivalent to exhaust gas as a carboxylating agent.
Article
Chemistry, Inorganic & Nuclear
Mika Takeuchi, Yutaka Amao
Summary: This study developed an effective visible-light driven system for fumaric acid production using renewable resources such as biomass derivatives, providing an alternative to the current petroleum-based synthesis methods.
DALTON TRANSACTIONS
(2024)
Article
Chemistry, Multidisciplinary
Yu Kita, Yutaka Amao
Summary: A method for synthesizing 3-hydroxybutyrate from CO2 and acetone using a system consisting of triethanolamine, water-soluble zinc porphyrin, pentamethylcyclopentadienyl coordinated rhodium complex, NAD(+), and a cell extract containing acetone carboxylase and 3-hydroxybutyrate dehydrogenase from Rhodobacter capsulatus SB1003 cultured in acetone-bicarbonate medium has been established. The conversion yield of acetone to 3-hydroxybutyrate can reach up to 81%.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Ryohei Sato, Yutaka Amao
Summary: This study investigated the detailed mechanism of formate production by Candida boidinii formate dehydrogenase (CbFDH) with NADH in the presence of different proportions of CO2, bicarbonate and carbonate. The pH of the buffer solution, CO2 concentration, and the apparent initial rate of formate production with CbFDH showed a good correlation. Under constant total carbonate concentration, the reduction of CO2 to formate followed Michaelis-Menten kinetics. Bicarbonate or carbonate did not act as competitive inhibitors of CO2 in the CbFDH-catalyzed formate production.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mika Takeuchi, Yutaka Amao
Summary: In this study, fumarate was successfully synthesized using a biocatalytic method in an aqueous medium. Malate and fumarase enzymes were used as catalysts, and the reaction was carried out using carbon dioxide and pyruvate as intermediates.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Yasuo Matsubara, Yumiko Muroga, Masako Kuwata, Yutaka Amao
Summary: Selective H-2 production based on formate decomposition can be substantially enhanced by using Pt-PVP/PDADMA, especially in acidic solutions.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Physical
Takayuki Katagiri, Yutaka Amao
Summary: The study achieved visible-light-driven molecular conversion using the photo and biocatalyst hybrid system. By utilizing the NADH regeneration system and various enzymes, selective enantioselective molecular conversions and photo and biocatalytic CO2 fixation were successfully accomplished.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Multidisciplinary
Kaori Murashima, Hideaki Yoneda, Hideaki Sumi, Yutaka Amao
Summary: A new system for the electrochemical production of formaldehyde from formate using formaldehyde dehydrogenase (FldDH) and methylviologen (MV2+) as an artificial cofactor has been developed. The maximum conversion yield for formaldehyde production was achieved at pH 10.3 after applying an external electrochemical bias for 3 hours. Efficient electron injection from the electrode into MV2+ bound to FldDH was found to be a key process in formate reduction towards the synthesis of methanol from CO2.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Takayuki Katagiri, Yutaka Amao
Summary: The catalytic activity of Rh nanoparticles dispersed by polyvinylpyrrolidone (Rh-PVP) for NADH regeneration was discovered. Selective reduction of NAD(+) to enzyme active NADH was achieved in the presence of an electron donor, ZnTPPS as a photosensitizer, and Rh-PVP, resulting in only 1,4-NADH as the reduction product of NAD(+), validated by enzymatic assay and HPLC.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Takumi Toyodome, Yutaka Amao, Masanobu Higashi
Summary: A hybrid system with a CdS-modified CuInS2 photocathode, methylviologen as the electron mediator, and biocatalytic formate dehydrogenase from Candida boidinii was prepared for photoelectrochemical reduction of CO2 to formate, achieving a high conversion efficiency of about 64% at 700 nm and 0.09 V vs. RHE.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yu Kita, Yutaka Amao
Summary: A new method for lactate production without toxic substances was developed by selectively reducing pyruvate to lactate using a visible light-driven redox system. This method achieved a reduction efficiency of up to 40% with visible light irradiation for 24 hours, and the addition of zinc acetate promoted lactate production in the photoredox system.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yusuke Minami, Yutaka Amao
Summary: This study successfully achieved efficient and selective H2 production from formic acid in a low pH range by using platinum nanoparticles dispersed by polyvinylpyrrolidone and cationic poly-l-amino acid polymers. Different combinations of catalysts showed varying effects on H2 production at different pH values, with Pt-PVP/PLL showing improved catalytic activity compared to other catalysts.
NEW JOURNAL OF CHEMISTRY
(2021)
