Study on fluorometric determination of hydrogen peroxide catalyzed by iron(III)-tetrasulfonato-phthalocyanine with thiamine hydrochloride as a substrate

被引:18
作者
Chen, QY [1 ]
Li, DH [1 ]
Zhu, QZ [1 ]
Zheng, H [1 ]
Xu, JG [1 ]
机构
[1] Xiamen Univ, Dept Chem, Res Lab SEDC Analyt Sci Mat & Life Chem, Xiamen 361005, Peoples R China
基金
中国国家自然科学基金;
关键词
mimetic enzyme; spectrofluorimetric determination; hydrogen peroxide; glucose; thiamine; iron-tetrasulfonatophthalocyanine;
D O I
10.1080/00032719908542833
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Iron(III)-tetrasulfonatophthalocyanine(FeTSPc) has been used as a mimetic enzyme in the determination of hydrogen peroxide with thiamine hydrochloride as a fluorogenic substrate. The determinations were carried out in both acidic and basic environments, with different limits of detection and linear ranges. In acidic condition, the linear calibration graph was obtained from 5.0x10(-8) mol/L to 8.0x10(-6) mol/L, with a detection limit of 2.1x10(-8) mol/L H2O2 when Na2HPO4-citric buffer solution (pH 2.8) was used as the reaction medium. It was also found that using one of the three polybasic carboxylic acids such as citric acid, tartaric acid and malonic acid as the catalytic reaction medium can lead to particularly sensitive systems, permitting a detection limit as low as 3.5x10(-9) mol/L H2O2; whereas in basic reaction medium (Na2CO3-NaHCO3 buffer solution, pH = 10.0), the linear range of the calibration graph was from 5.0x10(-8) mol/L to 2.0x10(6) mol/L H2O2 with a detection limit of 1.4x10(-8) mol/L. The applicability of the method to the determination of glucose in human serum was demonstrated by investigating the recovery of the known glucose added to human serum.
引用
收藏
页码:457 / 469
页数:13
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