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通过测定对羟自由基、超氧负离子自由基的清除率和还原能力,研究了壳聚糖、硫脲壳聚糖及5种硫脲壳聚糖金属配合物的抗氧化活性。结果表明:在实验设置的浓度范围内,对羟自由基的清除能力依次为硫脲壳聚糖Cu(Ⅱ)>硫脲壳聚糖Fe(Ⅱ)>硫脲壳聚糖Co(Ⅱ)>硫脲壳聚糖Ni(Ⅱ)>硫脲壳聚糖Zn(Ⅱ),且清除能力随着浓度的增加而增强;对超氧负离子自由基清除能力依次为硫脲壳聚糖Ni(Ⅱ)>硫脲壳聚糖Zn(Ⅱ)>硫脲壳聚糖Co(Ⅱ)>硫脲壳聚糖Cu(Ⅱ)>硫脲壳聚糖Fe(Ⅱ),且清除能力随着浓度的增加而增强;还原能力依次为硫脲壳聚糖Co(Ⅱ)>硫脲壳聚糖Cu(Ⅱ)>硫脲壳聚糖Fe(Ⅱ)>硫脲壳聚糖Ni(Ⅱ)>硫脲壳聚糖Zn(Ⅱ)。
The antioxidant activities of chitosan, thiourea chitosan and five kinds of thiourea chitosan metal complexes were studied by measuring the scavenging and reducing abilities of hydroxyl radicals and superoxide anion free radicals. The results showed that the scavenging capacity of hydroxyl free radicals in the range of experimental concentration were thiourea chitosan Cu (Ⅱ)> thiourea chitosan Fe (Ⅱ)> thiourea chitosan Co (Ⅱ)> Thiourea chitosan Ni (Ⅱ)> thiourea chitosan Zn (Ⅱ), and its scavenging ability increased with the increase of concentration. The scavenging ability on superoxide anion radical was as follows: thiourea chitosan Ni (Ⅱ) > Thiourea chitosan Zn (Ⅱ)> thiourea chitosan Co (Ⅱ)> thiourea chitosan Cu (Ⅱ)> thiourea chitosan Fe (Ⅱ), and its scavenging capacity increased with concentration (Ⅱ)> thiourea chitosan Cu (Ⅱ)> thiourea chitosan Fe (Ⅱ)> thiourea chitosan Ni (Ⅱ)> thiourea chitosan poly Sugar Zn (Ⅱ).