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| Section2 = | Section3 = }} Bixin is an apocarotenoid found in annatto, a natural food coloring obtained from the seeds of the achiote tree (''Bixa orellana''). Annatto seeds contain about 5% pigments, which consist of 70-80% bixin.〔(Executive Summary Bixin ), National Toxicology Program〕 Bixin is chemically unstable when isolated and converts via isomerization into ''trans''-bixin (β-bixin), the double-bond isomer.〔 Bixin is soluble in fats but insoluble in water. Upon exposure to alkali, the methyl ester is hydrolyzed to produce the dicarboxylic acid norbixin, a water-soluble derivative. : : : ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bixin」の詳細全文を読む スポンサード リンク
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