THE SINGLET OXYGEN AND CAROTENOID INTERACTION
THE SINGLET OXYGEN AND CAROTENOID INTERACTION
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DOI：
10.1016/1011-1344(91)80266-k
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发表时间：
1991-10-01
影响因子：
5.4
通讯作者：
TRUSCOTT, TG
中科院分区：
文献类型：
--
作者：
CONN, PF;SCHALCH, W;TRUSCOTT, TG
用时间分辨发光技术测定了室温下苯和甲苯中类胡萝卜素对O2（1- δ -g）的猝灭二阶速率常数K(Q)。在所研究的C40色素中，番茄红素被发现是最有效的猝灭剂，但与全反式β -胡萝卜素相比，其提高的效率比以前报道的要低。将O2（1-DELTA-g）的猝灭效率扩展到许多不同粘度的溶剂。发现K(Q)与溶剂粘度成反比，尽管这种关系不是简单的线性关系。结果表明热力学因素的参与。O2（1-DELTA-g）的失活效率随着共轭碳碳双键K(Q)(C60) > K(Q)(C50) > K(Q)（C40）的增加而增加。许多叶黄素被纳入本研究；似乎是环氧基而不是羰基或羟基取代基增加了类胡萝卜素相对于O2（1- δ -g）的反应性。
Second-order rate constants K(Q) for the quenching of O2(1-DELTA-g) by carotenoids were determined at room temperature in benzene and toluene using the technique of time-resolved luminescence. Of the C40 pigments studied, lycopene was found to be the most efficient quencher, but the increased efficiency compared with all-trans beta-carotene was less than previously reported. The efficiency of quenching of O2(1-DELTA-g) was extended to a number of solvents with varying viscosities. K(Q) was found to be inversely proportional to solvent viscosity, although the relationship is not simply linear. The results suggest the involvement of thermodynamic factors. The efficiency of deactivation of O2(1-DELTA-g) was found to increase with the number of conjugated carbon-carbon double bonds, i.e. K(Q)(C60) > K(Q)(C50) > K(Q)(C40). A number of xanthophylls were included in this study; it would appear that an epoxide group rather than carbonyl or hydroxyl substituents increase the reactivity of the carotenoid with respect to O2(1-DELTA-g).