Preparation of the different derivatives of the low-molecular-weight porphyran from Porphyra haitanensis and their antioxidant activities in vitro |
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Authors: | Zhongshan Zhang Quanbin Zhang Jing Wang Hong Zhang Xizhen Niu Pengcheng Li |
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Institution: | 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | Porphyran extracted from Porphyra haitanensis is a sulfated polysaccharide, which possesses excellent antioxidant activities. In this study, we prepared one low-molecular-weight porphyran and its sulfated, acetylated, phosphorylated and benzoylated derivatives. Their antioxidant activities were investigated including scavenging effect of superoxide, hydroxyl and 1,1-diphenyl-2-picrylhydrazyl radicals. The results of chemical analysis and FT-IR spectrums showed the modification was successful. And in addition, we found that certain derivative exhibited stronger antioxidant activity than low-molecular-weight porphyran. The benzoylated derivative showed the most excellent antioxidant activity in three assays, so this derivative needs to be attended to. |
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