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| Reaction of carotenoids with CCl_3OO~· by using pulse radiolysis | |
| 引用本文： | 赵文恩,姚思德,王强,钱素平,王文峰,韩雅珊. Reaction of carotenoids with CCl_3OO~· by using pulse radiolysis[J]. 中国科学B辑(英文版), 2003, 46(1) |
| 作者姓名： | 赵文恩 姚思德 王强 钱素平 王文峰 韩雅珊 |
| 作者单位： | Chemical Engineering College，Zhengzhou University，Zhengzhou 450002，China，Laboratory of Radiation Chemistry，Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China，Crop Germplasm Resources Institute，Chinese Academy of Agricultural Sciences，Beijing 100081，China，Laboratory of Radiation Chemistry，Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China，Laboratory of Radiation Chemistry，Shanghai Institute of Nuclear Research，Chinese Academy of Sciences，Shanghai 201800，China，College of Food Sciences，China Agricultural University，Beijing 100094，China |
| 摘 要： | CCl4 as a selective toxin to liver can be metabolized into the free radical 3CClg by cyto- chrome P450 through a reductive dehalogenation. In the presence of oxygen, 3CClg reacts rapidly with O2 to form CCl3OO·[1], which reacts with various biological molecules, including DNA bases, amino acids and lipids and leads to various types of tissue injury[2]. CCl3OO· is used as a model of alkyl peroxyl radicals because it can be generated in water/alcohol solution, in which sufficient solubi… |
| 关 键 词： | β-carotene |
Reaction of carotenoids with CCl3OO· by using pulse radiolysis |
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| Affiliation: | 1. Chemical Engineering College, Zhengzhou University, Zhengzhou 450002, China 2. Laboratory of Radiation Chemistry, Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, China 3. Crop Germplasm Resources Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China 4. College of Food Sciences, China Agricultural University, Beijing 100094, China |
| Abstract: | The interactions of carotenoids (bixin, β-carotene and lycopene) with CCl3OO@ in aqueous and i-propylalcohol solution saturated with air have been studied by pulse radiolysis. For bixin and β-carotene reaction products from forming process, absorbing in the region of 650 nm, is observed with concomitant carotenoid bleaching (bixin at 500 nm, β-carotene at 450 nm). Their rate constants from forming process are 1.78×108 and 7.8×107 mol-1@L@s-1 respectively. However, in the case of lycopene, no such a forming process of reaction as bixin and β-carotene can be observed although there is the bleaching reaction (rate constant 4×107 mol-1@L@s-1). The results suggest that the carotenoid radical cationand an additional radical are produced in the case of bixin and β-carotene, whereas lycopene undergoes electron transfer with CCl3OO@, forming cation radical. |
| Keywords: | bixin b-carotene lycopene trichloromethyl peroxyl radical pulse radiolysis transient absorption. |
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