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KMID : 0903519960390040304
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1996 Volume.39 No. 4 p.304 ~ p.308
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Chemical Structure of the Major Color Component from a Korean Pigmented Rice Variety
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Abstract
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The major color component of a Korean pigmented rice (Oryza sativa var. Suwon 415) was purified with Amberlite XAD-7 column and preparative paper chromatography. The purified pigment was determined as anthocyanin by paper chromatography, UV/Vis and NMR spectroscopy. The λ_(max) of the purified anthocyanin on UV/Vis spectrum were 529 ㎚ and 281 ㎚. The A_(440)/A_(525) value of the purified anthocyanin was 23% suggesting the presence of 3-glycosidic structure. The aglycone from acid hydrolysis showed bathochromic shift (18 ㎚) in the presence of AlCl₃ indicating that the anthocyanidin contained free adjacent hydroxyl groups such as cyanidin, delphinidin, petunidin or luteolinidin. The sugar moiety obtained from acid hydrolysis was determined as glucose by paper chromatography. The NMR spectra showed that the aglycone was cyanidin and the sugar was β-D-glucopyranose. Thus, the chemical structure of the purified anthocyanin was identified as cyanidin 3-O-β-D-glucopyranoside.
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