1. any of a class of blue dyes formed by the oxidation of phenols in the presence of amines, used in analytical chemistry and as indicators
Usage: chemistry; technical
2. a specific indophenol compound used in laboratory tests to detect and measure vitamin C (ascorbic acid) concentration
Usage: biochemistry; analytical chemistry

Examples

• The chemist used indophenol as a reagent to test for the presence of reducing sugars.
• Indophenol indicators turn from blue to colorless when reduced by vitamin C.
• The laboratory employed indophenol titration to quantify ascorbic acid in the fruit juice sample.
• Indophenol dyes are valuable in analytical procedures for detecting various organic compounds.
• The blue color of indophenol faded as the reducing agent was added to the solution.