Ce(Ⅵ)与6种天然黄酮化合物的氧化还原体系及其应用
龚双梅;李晓波;张荣荣;赵良容;杨昌英
【期刊名称】《应用化学》 【年(卷),期】2011(028)011
【摘要】Six different natural flavonoids with similar structures, quercetin, kaempferol, luteolin, naringenin, baicalein, and apigenin were selected to examine the redox system between flavonoids and Ce ( IV ) using ultraviolet spectrophotometry and microtitration methods. According to their responding difference to Ce( IV) , the mechanism of the reaction and the contribution of phenolic hydroxyls on different sites of the chromone to the antioxidation activity were investigated. The result indicates that the 3-OH of the pyrone ring is a sensitive site to react with Ce( IV) involving the proton dissociation, and the obtained product has a strong absorbance at 294 nm. The 3'-OH and 4'-OH on the B ring of the 2-phenyl-chromone are also the sensitive sites to oxidants since 4'-0H dissociates and forms intramolecular hydrogen bonding. The hydroxyl on ring C is more sensitive to Ce( IV) than that on ring A. The antioxidant capacity order of the six compounds is: Quercetin > Kaempferol > Luteoin > Apigenin > Baicalein > Naringenin, which is consistent with the sensitivity of spectral response of the six compounds to Ce(Ⅳ).%选取结构相近的6种天然黄酮化合物:槲皮素( Quercetin)、山奈酚(Kaempferol)、木犀草素(Luteolin)、柚皮素(Naringenin)、黄芩素(Baicalein)
Ce(Ⅵ)与6种天然黄酮化合物的氧化还原体系及其应用
