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    The Effect of the Molecular Architecture on the Antioxidant Properties of Chitosan Gallate

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    14
    Author
    Wu, C; Wang, L; Fang, Z; Hu, Y; Chen, S; Sugawara, T; Ye, X
    Date
    2016-05-01
    Source Title
    Marine Drugs
    Publisher
    MDPI
    University of Melbourne Author/s
    Fang, Zhongxiang
    Affiliation
    Agriculture and Food Systems
    Metadata
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    Document Type
    Journal Article
    Citations
    Wu, C., Wang, L., Fang, Z., Hu, Y., Chen, S., Sugawara, T. & Ye, X. (2016). The Effect of the Molecular Architecture on the Antioxidant Properties of Chitosan Gallate. MARINE DRUGS, 14 (5), https://doi.org/10.3390/md14050095.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/260469
    DOI
    10.3390/md14050095
    Abstract
    To elucidate the structure-antioxidant activity relationships of chitosan gallate (CG), a series of CG derivatives with different degrees of substitution (DS's) and molecular weights (MWs) were synthesized from chitosan (CS) and gallic acid (GA) via a free radical graft reaction. A higher MW led to a lower DS of CG. The structures of CG were characterized by FT-IR and ¹H NMR, and results showed that GA was mainly conjugated to the C-2 and C-6 positions of the CS chain. The antioxidant activity (the DPPH radical scavenging activity and reducing power) were enhanced with an increased DS and a decreased MW of CG. A correlation between antioxidant activities and the DS and MW of CG was also established. In addition, a suitable concentration (0~250 μg/mL) of CG with different MWs (32.78~489.32 kDa) and DS's (0~92.89 mg·GAE/g CG) has no cytotoxicity. These results should provide a guideline to the application of CG derivatives in food or pharmacology industries.

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