The triplet properties of beta-carotene in acetonitrile solution: A laser flash photolysis study
文献类型：期刊论文
| 作者 | Zhang, ZX(张兆霞） ; Zhao, HW（赵红卫） ; Zhu, HP ; Hao, SM ; Wang, WF（王文锋） ; Li, WX（李文新） ; Navaratnam, S |
| 刊名 | SPECTROSCOPY AND SPECTRAL ANALYSIS
 |
| 出版日期 | 2008 |
| 卷号 | 28期号:3页码:481 |
| ISSN号 | 1000-0593 |
| 通讯作者 | Wang, WF (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China |
| 英文摘要 | The representative of carotenoids, beta-carotene, can scavenge reactive oxygen radicals like singlet molecular oxygen, nitrogen dioxide radical and peroxyl radical due to the effective antioxidative properties. In medicine, beta-carotene is used to alleviate the disease erythropoietic protoporphyria (EPP), by intercepting the triplet state of protoporphyrin (a porphyrin lacking a central metalion, a precursor to haem) therefore preventing the formation of singlet oxygen. Epidemiological evidence has suggested that dietary beta-carotene may inhibit certain types of cancer. Much of work has been carried out in benzene, toluene, or chloroform as most caroienoids are sufficiently soluble in these nonpolarity solvents. In the present paper, the generation and properties of triplet beta-carotene in acetonitrile solution were investigated with 355 nm laser flash photolysis. 2-acetonaphthone was used as an excitation energy donor to sensitize the production of the triplet state of beta-carotene. Excitation of the solution containing 2-acetonaphthone and beta-carotene upon 355 nm laser flash produced the triplet of 2-acetonaphthone (420 nm) firstly. Subsequently, the excitation energy of triplet 2-acetonaphthone was transferred to beta-carotene generating triplet beta-carotene. Characteristic absorption spectra of triplet beta-carotene (510 nm) were recorded. By means of transfer of excitation energy, the molar absorption coefficients of triplet beta-carotene were determined to be 23 000 dm(3) mol(-1).cm(-1) at 510 nm. The triplet lifetime for beta-carotene in acetonitrile solution was observed to be 15.6 mu s. The rate constant for the reaction of triplet energy transfer from triplet 2-acetonaphthone to beta-carotene was calculated to be 1.5 X 10(10) dm(3).mol(-1).s(-1). Obviously, the triplet beta-carotene has very low excitation energy. Taking the advantage of the photochemical properties of triplet beta-carotene, beta-carotene has been widely used as energy acceptor to determine the excited state characteristic of other substance. This work extends the understanding of photochemical properties of beta-carotene. |
| 学科主题 | Biochemistry & Molecular Biology |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000256273800001 |
| 公开日期 | 2012-04-18 |
| 源URL | [http://ir.sinap.ac.cn/handle/331007/7861]  |
| 专题 | 上海应用物理研究所_中科院上海应用物理研究所2004-2010年 |
| 推荐引用方式 GB/T 7714 | Zhang, ZX,Zhao, HW,Zhu, HP,et al. The triplet properties of beta-carotene in acetonitrile solution: A laser flash photolysis study[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2008,28(3):481. |
| APA | Zhang, ZX.,Zhao, HW.,Zhu, HP.,Hao, SM.,Wang, WF.,...&Navaratnam, S.(2008).The triplet properties of beta-carotene in acetonitrile solution: A laser flash photolysis study.SPECTROSCOPY AND SPECTRAL ANALYSIS,28(3),481. |
| MLA | Zhang, ZX,et al."The triplet properties of beta-carotene in acetonitrile solution: A laser flash photolysis study".SPECTROSCOPY AND SPECTRAL ANALYSIS 28.3(2008):481. |
入库方式： OAI收割
来源：上海应用物理研究所
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