Abstract
AbstractA qualitative and quantitative study of the constituents of quinoline yellow (C.I. 47005) in several samples is presented here. The isolation through preparative ion pairs HPLC of these constituents, followed by a spectroscopic examination (UV‐visible, IR, 1H ‐ NMR) and by a study which compares them to synthesized derivatives, shows that quinoline yellow commercial samples contain chiefly disodic salts of 2‐(2′‐quinolyl) 1, 3‐indandione sulfonic acids sulfonated respectively on 5,6′ and 5,8′ positions. Some samples contain also important quantities of the last mentioned compound methylated on 6′ position.
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