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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Synthesis, characterization and antioxidant activity of quaternized carboxymethyl chitosan oligosaccharides
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Synthesis, characterization and antioxidant activity of quaternized carboxymethyl chitosan oligosaccharides

机译：季铵化羧甲基壳聚糖寡糖的合成，表征及抗氧化活性

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摘要

In order to determine the effect of quaternary ammonium groups and carboxymethyl groups of chitosan on antioxidant activity, nine quaternized carboxymethyl chitosan oligosaccharides (QCMCOs) were prepared from chitosan with chloroacetic acid and 2,3-epoxypropyltrimethyl ammoniumchloride as the modifying agent under microwave irradiation. The structures of QCMCOs were characterized by FT-IR, NMR, XRD and their Mw were detected by gel permeation chromatography (GPC). The thermal stability was evaluated by thermal gravimetric analysis (TGA), and their antioxidant activities were investigated including scavenging activity of superoxide and hydroxyl radical, reducing power and metal chelating ability. The results revealed that the introduction of quaternary ammonium groups and carboxymethyl groups decreased the crystallinity and the thermal stability of chitosan oligosaccharide (COS), and their antioxidant activities were closely related to the degree of substitution of quaternary ammonium groups and the carboxymethyl groups. This study provides important guidelines for developing new antioxidant agents.
机译：为了确定壳聚糖的季铵基和羧甲基对抗氧化活性的影响，在微波辐射下，由壳聚糖以氯乙酸和2,3-环氧丙基三甲基氯化铵为改性剂制备了九种季铵化的羧甲基壳聚糖寡糖（QCMCO）。通过FT-IR，NMR，XRD表征了QCMCOs的结构，并通过凝胶渗透色谱法（GPC）检测了其Mw。通过热重量分析法（TGA）评估热稳定性，并研究其抗氧化活性，包括清除超氧化物和羟基自由基，降低功率和金属螯合能力。结果表明，季铵基和羧甲基的引入降低了壳聚糖寡糖（COS）的结晶度和热稳定性，其抗氧化活性与季铵基和羧甲基的取代程度密切相关。这项研究为开发新型抗氧化剂提供了重要指导。

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