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Rate constant (kψ) versus [Nin] on the study of histidine and ninhydrin in surfactants: (A) 16-6-16, (B) 16-5-16 and (C) 16-4-16. Reaction conditions: [His] = 1 × 10−4 mol dm−3, [16-s-16] = 30 × 10−5 mol dm−3, temperature = 343 K and pH = 5.0.
