2-Phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-Oxide (PTIO<sup>•</sup>) Radical Scavenging: A New and Simple Antioxidant Assay <i>In Vitro</i>
作者:Xican Li
DOI:10.1021/acs.jafc.7b02247
日期:2017.8.2
Current in vitro antioxidant assays have several limitations, which frequently cause inconsistent results. The study develops a new antioxidant assay using the 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide radical (PTIO•). After the investigation of various factors, the experimental protocol was briefly recommended as follows: PTIO• and the sample solution were added to phosphate buffer (pH
当前的体外抗氧化剂测定法有几个局限性,经常导致不一致的结果。该研究使用2-苯基-4,4,5,5-四甲基咪唑啉-1-氧基3-氧化物自由基(PTIO •)开发了一种新的抗氧化剂测定法。在研究了各种因素之后,简要推荐了以下实验方案:将PTIO •和样品溶液加入磷酸盐缓冲液(pH 7.4,50 mM)中,在37°C下孵育2 h,然后在557处进行分光光度法测量纳米 基于20种纯化合物和30种冻干水提取物的验证测试表明PTIO •清除具有良好的线性关系,稳定性和可重复性。在结合电喷雾电离四极杆飞行时间串联质谱分析的超高效液相色谱中,当遇到l-抗坏血酸时,观察到PTIO •给出m / z 234 。作为抗氧化剂测定,PTIO •清除具有四个优点,即以氧为中心的自由基,生理水溶液,简单直接的测量以及对被测样品的干扰较小。它也可以令人满意地分析抗氧化剂的结构-活性关系。PTIO •清除没有立体特异性,至少涉及H