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Spectra obtained in aqueous system as well as gemini micellar system on [Cu(II)-Trp]+ and ninhydrin reaction at 353 K after heating 2 h: (rectangle) aqueous, (circle) 16-6-16, (triangle) 16-5-16 and (inverted triangle) 16-4-16. Experimental conditions: [ninhydrin] = 6 mmol kg−1, [Cu(II)-Trp]+ = 0.2 mmol kg−1, [16-s-16] = 30 × 10−2 mmol kg−1 and pH = 5.0.
