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Studies on the Blue Pigments Produced from Genipin and Methylamine. I. Structures of the Brownish-Red Pigments, Intermediates Leading to the Blue Pigments.
Chemical and Pharmaceutical Bulletin · 1994 · Vol. 42(3) · pp. 668–673
Ryousuke TOUYAMA✉Yoshio TakedaKenichi InoueIkuo KawamuraMasahiko YATSUZUKAT. IkumotoTetsuro ShinguToshio YokoiHiroyuki Inouye
Abstract
During the course of studies on the blue pigment formation by the reaction of genipin with methylamine, nine red to brownish-red intermediary pigments were obtained under conditions excluding oxygen. They were identified as monomer, dimer, trimer and tetramer of 2-methyl-4-carbomethoxy-2-pyrindine derivatives on the basis of spectroscopic evidence.
Dye analysis and toxicitySaffron Plant Research StudiesChemistryPigmentTrimerTetramerMethylamineDimerMonomerGenipinBlue lightPhotochemistry
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