Article
Biochemistry & Molecular Biology
Luyao Bian, Huigang Sun, Ying Zhou, Yang Tao, Chong Zhang
Summary: Bio-enzymatic grafting of phenolic acid to chitosan derivative is an efficient and environmentally friendly synthesis technology. The grafting of gallic acid to N-carboxymethyl chitosan was successfully achieved using recombinant bacterial laccase. The GA-g-CMCS coating showed positive effects on maintaining the freshness and prolonging the shelf life of strawberries.
Article
Agricultural Engineering
Senmiao Fang, Xuechun Feng, Yafang Lei, Zhangjing Chen, Li Yan
Summary: The study demonstrated that the cinnamaldehyde chitosan emulsion significantly improved the decay resistance of the treated wood by inhibiting the growth of decay fungi and altering their mycelial morphology. The formation of Schiff base in the treated wood enhanced the decay resistance, with better performance against brown-rot fungi compared to white-rot fungi. This suggests that the cinnamaldehyde chitosan emulsion can be effectively utilized as an environmentally friendly wood preservative.
INDUSTRIAL CROPS AND PRODUCTS
(2021)
Article
Polymer Science
Fangdong Zhang, Yandong Tang, Xiaoli Yang, Yufan Pan, Qingxi Hou, Yumei Ding, Jicheng Pei
Summary: In this study, carboxylated chitosan oligosaccharide (C-COS) was prepared by selectively oxidizing chitosan oligosaccharide (COS) and its inhibitory effects on lipid peroxidation were evaluated in vitro. The results showed that C-COS exhibited better inhibition effects than COS, which was mainly attributed to the chelation of carboxylic acid groups on C6 with metal ions, reducing the generation of free radicals. Additionally, exposing more amino sites outside the sugar chain promoted the capture of free radicals, effectively preventing lipid peroxidation.
Article
Green & Sustainable Science & Technology
Ai-Di Cheng, Min-Hua Zong, Guang-Hui Lu, Ning Li
Summary: A simple yet effective solvent engineering strategy has been developed to enable aromatic alcohols/aldehydes to be efficiently oxidized to carboxylic acids by a laccase-TEMPO system. Citrate buffer is found to be optimal for this purpose. This chemoenzymatic approach shows promise as an alternative to traditional chemical oxidations for the synthesis of carboxylic acids.
ADVANCED SUSTAINABLE SYSTEMS
(2021)
Article
Biochemistry & Molecular Biology
Qun Liu, Yan Li, Shu Xing, Ling Wang, Xiaodeng Yang, Fei Hao, Mingxia Liu
Summary: In this study, two amphiphilic chitosan derivative films were prepared by crosslinking with genipin, and they showed excellent mechanical properties, antibacterial activity, and preservation effects on fruits.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Multidisciplinary
Qiaobin Hu, Fang Zhou, Ngoc Kim Ly, Jerryck Ordyna, Tiffany Peterson, Zhaoyang Fan, Shu Wang
Summary: Phytochemical nanoencapsulation and edible coatings are two emerging technologies. This study integrates these technologies by embedding phytochemical-encapsulated nanoparticles in an edible coating on fresh fruits. The results demonstrate that the phytochemical nanoencapsulation-based edible coating has significant effects in maintaining moisture, preventing nutrient loss, inhibiting microbial growth, increasing nutritional value, preserving strawberry quality, and extending shelf life.
Article
Agricultural Engineering
Zhipeng Qiu, Xixi Zeng, Jinchuan Xu, Bo Zheng, Ling Chen
Summary: The regioselective oxidation of native maize starch (NMS) using the laccase-TEMPO system resulted in the development of oxidized maize starch (OMS) with enhanced water absorption properties. The regioselective oxidation caused a shift from ordered to disordered structures, leading to a slight degradation of OMS chains and destruction of part of the short-range ordered structure, aggregate structure, and crystalline structure. However, the crystalline type, amorphous lamellae thickness, and morphology of the starch granules were largely maintained.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Food Science & Technology
Jiaqi Xiao, Caiqin Gu, Dongxue Zhu, Yukai Huang, Yunsi Luo, Qiqin Zhou
Summary: A new chitosan/zein-cinnamaldehyde (CHI/zein-CMA) nano composite film was developed for mango preservation, effectively delaying yellowing, vitamin C loss, and malondialdehyde accumulation during storage. The optimized formula and structural improvements observed under SEM offer a feasible approach for mango preservation.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Pawel Borowiecki, Aleksandra Rudzka, Tamara Reiter, Wolfgang Kroutil
Summary: In this study, a sequential chemoenzymatic one-pot two-step deracemization protocol was developed for synthesizing enantiomeric Lisofylline. The protocol involved a tandem bi-enzymatic oxidation-reduction reaction sequence, which catalyzed the oxidation of Lisofylline to pentoxifylline using laccase and a redox mediator, and the subsequent reduction of pentoxifylline to generate enantiomeric Lisofylline using alcohol dehydrogenases. The method showcased high conversion rates and synthesis efficiency, providing both antipodes of Lisofylline in good yields and high enantiomeric excess.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jianmin Zhou, Zhi-Yuan Ma, Chantale Shonhe, Su-Hui Ji, Yun-Rui Cai
Summary: The study presents a TEMPO-catalyzed electrosynthetic method for the dehydrogenative cyclocondensation of o-aminophenols to access pharmaceutically valuable 2-aminophenoxazinones. The method is mild, sustainable, and does not require stoichiometric oxidants, providing a new approach for the synthesis of bioactive compounds with improved structural diversity. Mechanistic studies show that electrochemically generated TEMPO+ enables the oxidative radical homo-dimerization of o-aminophenols.
Article
Agricultural Engineering
Huangjingyi Chen, Jie Jiang, Shuai Zhang, Juan Yu, Liang Liu, Yimin Fan
Summary: The study demonstrates that the use of the TLO oxidation system can effectively introduce carboxyl and aldehyde groups to cellulose from different sources. The oxidized cellulose can be processed into TLO-CNFs or TLO-CNCs with excellent mechanical properties and high light transmittance.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Polymer Science
Jie Jiang, Huangjingyi Chen, Juan Yu, Liang Liu, Yimin Fan, Tsuguyuki Saito, Akira Isogai
Summary: The oxidation of cellulose by the TEMPO/laccase/O-2 system is an alternative method for producing cellulose nanofibers with potential. The concentration of TEMPO significantly impacts the oxidation efficiency, and increasing TEMPO concentration and extending oxidation time can enhance the oxidation effect. Different pH conditions affect the oxidation rate of TEMPO by laccase, with laccase showing higher activity at pH 4.5. TEMPO is primarily regenerated through a comproportionation reaction between oxoammonium and hydroxylamine.
MACROMOLECULAR RAPID COMMUNICATIONS
(2021)
Article
Biochemistry & Molecular Biology
Cynthia Lizeth Barrera-Martinez, Felipe Padilla-Vaca, Ioannis Liakos, Hector Ivan Melendez-Ortiz, Gladis Y. Cortez-Mazatan, Rene Dario Peralta-Rodriguez
Summary: The study investigated the impact of sodium tripolyphosphate on chitosan microparticles, revealing that TCIN-loaded CSMP exhibited significant cytotoxicity on MDCK and HeLa cell lines, indicating potential anti-cancer activity.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Biochemistry & Molecular Biology
Gabriela Abdalla, Cassamo Ussemane Mussagy, Giovana Sant'Ana Pegorin Brasil, Mateus Scontri, Josana Carla da Silva Sasaki, Yanjin Su, Camila Bebber, Raildis Ribeiro Rocha, Ana Paula de Sousa Abreu, Rogerio Penna Goncalves, Betina Sayeg Burd, Mariana Ferraz Pacheco, Karoline Mansano Romeira, Flavio Pereira Picheli, Nayrim Brizuela Guerra, Neda Farhadi, Juliana Ferreira Floriano, Samuel Forster, Siqi He, Huu Tuan Nguyen, Arne Peirsman, Zuzana Tirpakova, Shuyi Huang, Mehmet Remzi Dokmeci, Ernando Silva Ferreira, Lindomar Soares dos Santos, Rodolfo Debone Piazza, Rodrigo Fernando Costa Marques, Alejandro Gomez, Vadim Jucaud, Bingbing Li, Henriette Monteiro Cordeiro de Azeredo, Rondinelli Donizetti Herculano
Summary: Films and coatings made from bio-based materials can be a sustainable alternative for protecting and preserving agricultural products. In this study, pectin and chitosan coatings containing Sicilian lemon essential oil were developed to protect strawberries from spoilage and microbial contamination. The coatings showed good mechanical properties and antimicrobial effects.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Applied
Seyed Fakhreddin Hosseini, Jaber Ghaderi, M. Carmen Gomez-Guillen
Summary: Cinnamaldehyde-loaded chitosan nanoparticles were embedded into a ternary matrix to improve the physical, mechanical, and biological properties of the films. The incorporation of the nanoparticles significantly enhanced the tensile properties of the film and provided excellent UV-barrier properties. Additionally, the bioactive nanocomposites showed antibacterial activity and extended the shelf-life of rainbow trout fillets.
FOOD HYDROCOLLOIDS
(2022)