title: Anti-oxidative analysis, and identification and quantification of anthocyanin pigments in different coloured rice.
abstract: Anthocyanin pigments in coloured rice cultivars were isolated and identified using high-performance liquid chromatography techniques. Two black rice cultivars (Asamurasaki, Okunomurasaki) contained three major anthocyanins: cyanidin-3-glucoside, peonidin-3-glucoside and malvidin. Chinakuromai (black) rice additionally contained a fourth anthocyanin, petunidin-3-glucoside. Four red rice cultivars contained only malvidin. The total anthocyanin content varied greatly among black rice cultivars (79.5-473.7 mg/100g), but was lower in red rice (7.9-34.4 mg/100g). Total phenolic content was similar between red (460.32-725.69 mg/100g) and black (417.11-687.24 mg/100g) rice. The oxygen radical absorbing capacity was ranked as follows: red (69.91-130.32 μmol Trolox/g)>black (55.49-64.85 μmol Trolox/g)>green (35.32 μmol Trolox/g)>white (21.81 μmol Trolox/g) rice. The antioxidant capacity resulted mainly from the seed capsule, not the endosperm. The anthocyanin pigments contributed little to the total antioxidant capacity of red (0.03-0.1%) and black (0.5-2.5%) rice cultivars. Hence, the antioxidant capacity is derived mainly from other phenolic compounds.
authors.affiliation: Prefectural University of Hiroshima, 562 Nanatsuka, 727-0023 Shobara, Japan.
authors.forename: Xiao Qiong
authors.initials: XQ
authors.lastname: Chen
authors.forename: Norio
authors.initials: N
authors.lastname: Nagao
authors.forename: Tomio
authors.initials: T
authors.lastname: Itani
authors.forename: Kohei
authors.initials: K
authors.lastname: Irifune
mesh_terms: D000872:Anthocyanins / Q000737:chemistry*; D000975:Antioxidants / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D012275:Oryza / Q000737:chemistry* / Q000145:classification; D010858:Pigmentation; D012639:Seeds / Q000737:chemistry
chemical_list: D000872:Anthocyanins; D000975:Antioxidants