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Implication of varying pH on kψ for [Cu(II)-Trp]+ and ninhydrin reaction in 16-s-16 surfactants: (rectangle) 16-6-16, (circle) 16-5-16 and (triangle) 16-4-16. Reaction conditions: [Cu(II)-Trp]+ = 0.2 mmol kg−1, [ninhydrin] = 6 mmol kg−1, [16-s-16] = 30 × 10−2 mmol kg−1 and temperature = 353 K.
