Effect of polar solvents on beta-carotene radical precursor
文献类型：期刊论文
| 作者 | Tian, Yu-Xi1,2; Han, Rui-Min1,2; Zhang, Jian-Ping1,2; Skibsted, Leif H.3 |
| 刊名 | FREE RADICAL RESEARCH
 |
| 出版日期 | 2008-03-01 |
| 卷号 | 42期号:3页码:281-286 |
| 关键词 | Beta-carotene Radical Solvent Effect Antioxidant |
| ISSN号 | 1071-5762 |
| DOI | 10.1080/10715760801918693 |
| 英文摘要 | beta-Carotene forms radicals in chloroform upon photo-excitation (i) in the femtosecond time-scale by direct electron ejection into chloroform and (ii) in the microsecond time-scale by secondary reactions with chloroform radicals formed in the faster reactions. The precursor for beta-carotene radical cation decays in a second-order reaction in the mixed solvents, with a rate decreasing for increasing dielectric constant of cosolvent (acetic acid < ethanol < acetonitrile similar to methanol). The precursor is assigned as an ion pair from which the beta-carotene radical cation is formed in neat chloroform, but in more polar solvents it reacts at least partly through disproportionation in a bimolecular reaction promoted by the presence of ions. The stabilization of the radical precursor by increased solvent polarity, allowing for deactivation of the precursor by an alternative reaction channel, is discussed in relation to the balance of pro- and antioxidative properties of beta-carotene at lipid/water interfaces. |
| 语种 | 英语 |
| WOS记录号 | WOS:000255002200011 |
| 出版者 | TAYLOR & FRANCIS LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/63801]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Han, Rui-Min |
| 作者单位 | 1.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China 2.Chinese Acad Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, BNLMS, Beijing 100080, Peoples R China 3.Univ Copenhagen, Fac Life Sci, Dept Food Sci, DK-1058 Frederiksberg, Denmark |
| 推荐引用方式 GB/T 7714 | Tian, Yu-Xi,Han, Rui-Min,Zhang, Jian-Ping,et al. Effect of polar solvents on beta-carotene radical precursor[J]. FREE RADICAL RESEARCH,2008,42(3):281-286. |
| APA | Tian, Yu-Xi,Han, Rui-Min,Zhang, Jian-Ping,&Skibsted, Leif H..(2008).Effect of polar solvents on beta-carotene radical precursor.FREE RADICAL RESEARCH,42(3),281-286. |
| MLA | Tian, Yu-Xi,et al."Effect of polar solvents on beta-carotene radical precursor".FREE RADICAL RESEARCH 42.3(2008):281-286. |
入库方式： OAI收割
来源：化学研究所
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