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JIN Rou-nan, LI Le-le, GONG Chun-gui. Analysis of serum bile acid changes in patient of oral administration of UDCA after hepatocellular carcinoma resection[J]. Journal of Pharmaceutical Practice and Service, 2013, 31(1): 45-48. doi: 10.3969/j.issn.1006-0111.2013.01.013
Citation: QIU Lijuan, MENG Xin, HOU Shengshu, YANG Genjin, ZHONG Weiqing. Studies on the binding properties of Zn2+ ion to quercetin and the antioxidant activities[J]. Journal of Pharmaceutical Practice and Service, 2018, 36(1): 50-54. doi: 10.3969/j.issn.1006-0111.2018.01.010

Studies on the binding properties of Zn2+ ion to quercetin and the antioxidant activities

doi: 10.3969/j.issn.1006-0111.2018.01.010
  • Received Date: 2016-12-08
  • Rev Recd Date: 2017-04-25
  • Objective To study the anti-oxidation properties of Zn2+-quercetin complexes. Methods The binding stoichiometric ratios and the binding constant of Zn2+ to quercetin were measured with UV-Vis spectroscopy. The binding sites on quercetin were determined via 1H NMR spectroscopy. The antioxidant activities of Zn2+-quercetin complexes were compared to quercetin by scavenging DPPH radical method. The binding ratio of Zn2+ to quercetin depends on neutralization of phenol groups of quercetin. Results The binding ratio of Zn2+ to quercetin is 1:2 when less than two OH groups were deprotonated. The binding ratio is 1:1 when more than three OH groups were deprotonated. The apparent binding constant is 2.42×106 M-1 for the 1:1 Zn2+-quercetin complex. The 3'-OH and 4'-OH of quercetin are involved in the Zn2+ binding. The scavenging DPPH radical activity of Zn2+-quercetin complex is 2.3 times of quercetin. Conclusion These results provide a new insight to expand applications of this traditional Chinese medicine.
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    [10] 曾旭, 叶丹荣, 林德昌, 等. 含铋配合物与奈瑟氏菌铁结合蛋白的反应性质研究[J]. 无机化学学报, 2011, 27(11):2179-2184.
    [11] 王海燕, 曾秀, 张成平, 等. 槲皮素金属螯合物的研究与应用[J]. 食品科学, 2013, 34(13):361-364.
    [12] de Souza RF, De Giovani WF. Antioxidant properties of complexes of flavonoids with metal ions[J]. Redox Rep, 2004, 9(2):97-104.
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Studies on the binding properties of Zn2+ ion to quercetin and the antioxidant activities

doi: 10.3969/j.issn.1006-0111.2018.01.010

Abstract: Objective To study the anti-oxidation properties of Zn2+-quercetin complexes. Methods The binding stoichiometric ratios and the binding constant of Zn2+ to quercetin were measured with UV-Vis spectroscopy. The binding sites on quercetin were determined via 1H NMR spectroscopy. The antioxidant activities of Zn2+-quercetin complexes were compared to quercetin by scavenging DPPH radical method. The binding ratio of Zn2+ to quercetin depends on neutralization of phenol groups of quercetin. Results The binding ratio of Zn2+ to quercetin is 1:2 when less than two OH groups were deprotonated. The binding ratio is 1:1 when more than three OH groups were deprotonated. The apparent binding constant is 2.42×106 M-1 for the 1:1 Zn2+-quercetin complex. The 3'-OH and 4'-OH of quercetin are involved in the Zn2+ binding. The scavenging DPPH radical activity of Zn2+-quercetin complex is 2.3 times of quercetin. Conclusion These results provide a new insight to expand applications of this traditional Chinese medicine.

JIN Rou-nan, LI Le-le, GONG Chun-gui. Analysis of serum bile acid changes in patient of oral administration of UDCA after hepatocellular carcinoma resection[J]. Journal of Pharmaceutical Practice and Service, 2013, 31(1): 45-48. doi: 10.3969/j.issn.1006-0111.2013.01.013
Citation: QIU Lijuan, MENG Xin, HOU Shengshu, YANG Genjin, ZHONG Weiqing. Studies on the binding properties of Zn2+ ion to quercetin and the antioxidant activities[J]. Journal of Pharmaceutical Practice and Service, 2018, 36(1): 50-54. doi: 10.3969/j.issn.1006-0111.2018.01.010
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