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Related Concept Videos

Amines to Sulfonamides: The Hinsberg Test01:23

Amines to Sulfonamides: The Hinsberg Test

The Hinsberg test is a method to identify primary, secondary and tertiary amines, named after its pioneer, Oscar Hinsberg. Here, amines are treated with benzenesulfonyl chloride, also known as the Hinsberg reagent, in the presence of an excess of aqueous base, followed by acidification. Based on the nature of the amines, different changes are observed.
Generally, a primary amine reacts with the Hinsberg reagent to produce an N-substituted benzenesulfonamide. The electron-withdrawing sulfonyl...

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Optimization of Ninhydrin Test for Amino Acids by Multiple Reaction Monitoring Analysis.

Takashi Kurohara1, Chiye Tatebe1, Yumiko Fujiwara1

  • 1National Institute of Health Sciences.

Shokuhin Eiseigaku Zasshi. Journal of the Food Hygienic Society of Japan
|February 25, 2026
PubMed
Summary

The ninhydrin test for amino acids can lead to misjudgments due to variable reaction conditions. This study optimized the test using high-purity reagents and advanced analysis, improving accuracy for food additive identification.

Keywords:
Ruhemann’s purpleUHPLC/MS/MSamino acidfood additiveninhydrin test

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Area of Science:

  • Analytical Chemistry
  • Biochemistry

Background:

  • The ninhydrin test is a standard method for amino acid identification globally.
  • Ruhemann's purple (RP) formation and color are sensitive to reaction conditions and reagent quality.
  • Variations in reagent quality can impact the ninhydrin test's efficiency and accuracy.

Purpose of the Study:

  • To investigate the impact of reaction conditions on the ninhydrin test for amino acids.
  • To optimize ninhydrin test conditions for improved accuracy in identifying food additives according to JSFA.
  • To establish reliable identification methods for L-asparagine, L-cystine, and L-lysine salts.

Main Methods:

  • Performed ninhydrin tests using high-purity reagents as per JSFA specifications.
  • Utilized UHPLC/MS/MS for monitoring Ruhemann's purple (RP) formation under various conditions.
  • Employed HPLC-PDA to analyze reaction by-products, focusing on L-cystine.

Main Results:

  • Identified specific amino acids (L-asparagine, L-cystine, L-lysine salts) where reaction colors were suboptimal for identification.
  • Determined that sufficient RP production over brown by-products is crucial for accurate purple coloration, especially for L-cystine.
  • Established optimized ninhydrin test conditions based on RP monitoring and by-product analysis.

Conclusions:

  • Optimized ninhydrin test conditions enhance accuracy for JSFA-specified amino acid identification.
  • The study provides a scientific basis for improving official identification tests.
  • Findings contribute to more reliable quality control in food additive analysis.