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. 2020 Feb 5;7(2):191648. doi: 10.1098/rsos.191648

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Spectra of product formed on the study of histidine and ninhydrin in pure water and surfactants at 343 K and pH = 5.0 after heating 2 h: (A) aqueous, (B) 16-6-16, (C) 16-5-16 and (D) 16-4-16. Reaction conditions: [His] = 1 × 10⁻⁴ mol dm⁻³, [ninhydrin] = 6.0 × 10⁻³ mol dm⁻³ and [16-s-16] = 30 × 10⁻⁵ mol dm⁻³.