caa a22 4500 463155998 CHVBK 20180406164734.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s00217-006-0391-0 doi (NATIONALLICENCE)springer-10.1007/s00217-006-0391-0 Antioxidant activity of half N -acetylated water-soluble chitosan in vitro [Elektronische Daten] [Tao Feng, Yumin Du, Jin Li, Yuanan Wei, Pingjia Yao] Different molecular weight water-soluble chitosan (half N-acetylated chitosan) was prepared and the structure of water-soluble chitosan was characterized by FT-IR. The pH dependence of water solubility of water-soluble chitosan was evaluated from turbidity. Total antioxidant activity, reducing power, superoxide anion radical and hydroxyl radical quenching assay, metal chelating activity, and H2O2 scavenging activity were used for the evaluation of different molecular weight half N-acetylated chitosan in vitro. Low-molecular weight water-soluble chitosan (WSC4) exhibited high reductive capacity and expressed good inhibition of linoleic acid peroxidation in the linoleic acid model system. WSC4 (0.25mg/mL) scavenged 78.8% of superoxide radical. At 5mg/mL, scavenging percentage of WSC1, WSC2, WSC3, and WSC4 against hydroxyl radical was 49.3%, 66.8%, 77.1%, and 83.7%, respectively. These results indicate that water-soluble chitosan is an ideally natural antioxidant, and its antioxidant activity depends on its molecular weight. Springer-Verlag, 2006 Chitoan nationallicence Water soluble nationallicence Half N -acetylated nationallicence Antioxidant nationallicence Molecular weight nationallicence Feng Tao Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut Du Yumin Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut Li Jin Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut Wei Yuanan Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, 530004, Nanning, China aut Yao Pingjia Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, 530004, Nanning, China aut European Food Research and Technology Springer-Verlag 225/1(2007-05-01), 133-138 1438-2377 225:1<133 2007 225 217 https://doi.org/10.1007/s00217-006-0391-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00217-006-0391-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Feng Tao Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut NATIONALLICENCE 700 1- Du Yumin Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut NATIONALLICENCE 700 1- Li Jin Department of Environmental Science, Wuhan University, 430079, Wuhan, China aut NATIONALLICENCE 700 1- Wei Yuanan Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, 530004, Nanning, China aut NATIONALLICENCE 700 1- Yao Pingjia Guangxi Key Laboratory of Subtropical Bioresource Conservation and Utilization, Guangxi University, 530004, Nanning, China aut NATIONALLICENCE 773 0- European Food Research and Technology Springer-Verlag 225/1(2007-05-01), 133-138 1438-2377 225:1<133 2007 225 217 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer