Assessment of Acyl Groups and Reaction Conditions in the Competition between Perhydrolysis and Hydrolysis of Acyl Resorufins for Developing an Indicator Reaction for Fluorometric Analysis of Hydrogen Peroxide.
作者:Hatsuo Maeda、Shinya Matsu-ura、Mari Nishida、Yuji Yamauchi、Hidenobu Ohmori
DOI:10.1248/cpb.50.169
日期:——
Perhydrolysis of acetyl resorufin (AR) was reported previously to work as a fluorometric indicator reaction for glucose determination using only glucose oxidase. However, hydrolysis of AR in blank solution rendered the working concentration range of this method less than two orders of magnitude. To exclude or at least significantly reduce this interference, acyl groups and reaction conditions in the competition between perhydrolysis and hydrolysis of various acyl resorufins were assessed. Fluorometric evaluation of reactions in the presence or absence of H2O2 in phosphate buffer (pH 7.5, 100 mM)–CH3CN at 25 °C demonstrated that in tert-butylacetyl, isobutyryl, cyclohexanecarbonyl and pivaloyl resorufins (TBAR, IBR, CHR and PVR, respectively) among 10 acyl resorufins examined here, the competitive situation was shifted in a much more favorable way to perhydrolysis than in AR, although fluorometric responses due to their H2O2-dependent deacylation were suppressed in comparison with AR. Examination of the effects of pH, components and concentrations of buffers as well as reaction temperature established reaction conditions that not only allowed perhydrolysis of each of these four compounds to prevail over hydrolysis more effectively, but also improved the H2O2-based fluorometric responses. Thus, perhydrolysis of TBAR, IBR, CHR and PVR in phosphate buffer (pH 8.0, 20 mM)–CH3CN at 25 °C worked effectively as fluorometric indicator reactions for H2O2 analysis, affording a calibration curve over a concentration range of three orders of magnitude. Taking sensitivity, reproducibility and the response for blank solution into consideration, PVR seemed to be the best choice as a fluorochromogen for H2O2 determination under these conditions. For H2O2 analysis at lower pH, perhydrolysis of IBR in phosphate buffer (pH 7.5, 20 mM)–CH3CN was shown to effectively function as an indicator reaction. Applicability of the fluorometric methods with PVR and IBR to blood glucose determination was also discussed, comparing with Trinder's method with phenol, 4-aminoantipyrine and peroxidase (POD).
先前报道乙酰
试卤灵 (AR) 的过
水解可作为仅使用
葡萄糖氧化酶测定
葡萄糖的荧光指示剂反应。然而,空白溶液中 AR 的
水解使得该方法的工作浓度范围小于两个数量级。为了排除或至少显着减少这种干扰,评估了各种酰基
试卤灵的过
水解和
水解之间的竞争中的酰基和反应条件。在 25 °C 下,在
磷酸盐
缓冲液(pH 7.5,100 m
M)–CH3CN 中存在或不存在
H2O2 的情况下对反应进行荧光评估,结果表明在叔丁基
乙酰基、异丁酰基、
环己烷羰基和
新戊酰基试卤灵 (T
BAR ,IBR,CHR 和 PVR,分别)在这里检查的 10 种酰基
试卤灵中,竞争形势以比 AR 更有利的方式转向过
水解,尽管与 AR 相比,由于其 依赖性
脱酰化导致的荧光响应受到抑制。检查 pH 值、
缓冲液成分和浓度以及反应温度的影响,建立了反应条件,不仅使这四种化合物中的每一种化合物的过
水解更有效地压倒
水解,而且还改善了基于 的荧光响应。因此,T
BAR、IBR、CHR 和 PVR 在
磷酸盐
缓冲液(pH 8.0,20 m
M)–CH3CN 在 25 °C 下的过
水解可有效地作为 分析的荧光指示剂反应,提供超过三个数量级的浓度范围。考虑到灵敏度、重现性和空白溶液的响应,PVR 似乎是在这些条件下测定 的荧光
显色剂的最佳选择。对于较低 pH 下的 分析,IBR 在
磷酸盐
缓冲液(pH 7.5,20 m
M)–CH3CN 中的过
水解被证明可以有效地发挥指示反应的作用。还讨论了 PVR 和 IBR 荧光法测定血糖的适用性,并与
苯酚、
4-氨基安替比林和
过氧化物酶 (POD) 的 Trinder 法进行了比较。