Determination of sulphonated quinophthalones in Quinoline Yellow and its lakes using high-performance liquid chromatography
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Quinoline Yellow (QY, Colour Index No. 47005) is internationally used as a colour additive in foods, drugs, and cosmetics. The manufacture of QY requires sulphonating quinophthalone, and depending on the degree of sulphonation, various forms of QY result, cont... ...
