In the colourimetrically determin. of the degree of oxidn. of a fat or fat-contg. food the redox indicator is bromothymol blue (3,3'-dibromothylmol-sulphone-phthalein), bromocresol green (3,3',5,5'-tetrabromo-m-cresol-sulphonephthalein), cresol-indophenol (benzoquinone-(1,4)-mono 4-oxy-2-methylanil ) and/or thymol-indophenol (benzoquinone-(1,4)-mono- 4-oxy-2-methyl-5-isopropyl-anil ). Determn. is completed in 2 min. Process is simple and comprises adding indicator to sample tested and determining the colour change. In an example 1.5 ml molten fat were dissolved in 3.5 ml for a 2% KOH soln. in a 1:1 benzyl alcohol : n-propanol mixt. and mixed with 0.11 ml 0.1% bromothymol blut soln. in n-propanol.
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机译：用比色法测定。氧化程度。脂肪或含脂肪的食物。食物的氧化还原指示剂是溴百里酚蓝（3,3'-dibromothylmol-sulphone-phthalein），溴甲酚绿（3,3'，5,5'-tetrabromo-m-cresol-ulphthalein），甲酚-吲哚酚（苯醌-（1 ，4）-单4-氧-2-甲基茴香醚）和/或百里酚-吲哚酚（苯醌-（1,4）-单-4-氧-2-甲基-5-异丙基茴香醚）。确定。 2分钟内完成。过程很简单，包括将指示剂添加到测试样品中并确定颜色变化。在一个实施例中，将1.5ml的熔融脂肪溶解在3.5ml的2％KOH溶液中。在1：1的苄醇：正丙醇混合物中混合。并与0.11 ml 0.1％溴百里酚blut溶液混合。在正丙醇中。
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