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JEE Main201910 Jan 2019Evening ShiftChemistryBiomoleculesActual

Which of the following tests cannot be used for identifying amino acids?

Options

  1. ABiuret test
  2. BXanthoproteic test
  3. CBarfoed test
  4. DNinhydrin test

Correct answer

C. Barfoed test

Step-by-step solution

Barfoed’s test is used for distinguishing monosaccharides from reducing disaccharides. Monosaccharides usually react in about 1 - 2 minute while the reducing disaccharides take much longer time between 7 - 12 minutes to react with the reagent. Brick red color is obtained in this test which is due to formation of cuprous oxide Barfoed's test is basically used for detecting the presence of monosaccharides.

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