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Chromogenic reactions of several amino acids performed by SINICS. (A) chromogenic processes; and (B) wavelength scans of chromogenic products. The rightmost part of diagram A shows the reacted mixtures of the selected amino acids (from top to bottom: L-alanine, L-glutamic acid, L-serine, and L-lysine). SINICS: sensitivity intensified ninhydrin-based chromogenic system; and A570: absorbance at 570 nm.
