CAS OpenIR  > 中科院上海原子核所2003年前
Antioxidative properties of Martynoside: Pulse radiolysis and laser photolysis study
Miao, JL; Wang, WF(王文峰); Yao, S(姚思德); Navaratnam, S; Parsons, BJ
2003
Source PublicationFREE RADICAL RESEARCH
ISSN1071-5762
Volume37Issue:8Pages:829
AbstractFree radical reactions of Martynoside (MAR), a phenylpropanoid glycoside, with a variety of oxidants were studied in the aqueous solution by laser photolysis and pulse radiolysis techniques. The pK(a) value of MAR in aqueous solution was measured from the pH dependent changes of the UV absorption at 384 run with value of pK(a) = 9.2. The phenoxyl radical of MAR which exhibits maximum absorption at 360 nm was generated by one-electron transfer to N-3(.) or Br-2(.-). Other important properties of phenoxyl radical such as extinction coefficient, formation and decay rate constants were also determined. The reaction rate constant of O-2(.-) with MAR, k = 8.5 x 10(4) dm(3) . mol(-1) . s(-1), was measured by the method of competition kinetics. By measuring time-resolved luminescence emission at 1270 nm, the quenching rate constant of singlet oxygen by MAR was obtained to be 3.3 x 10(6) dm(3) . mol(-1) . s(-1). Reduction potential of the MAR couple (MAR(.) /MAR), determined using rutin as reference compound, gave a value E=0.66V vs. NHE. The antioxidative properties of MAR were compared with those of some well-known antioxidants.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000184427500005
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/9868
Collection中科院上海原子核所2003年前
Recommended Citation
GB/T 7714
Miao, JL,Wang, WF,Yao, S,et al. Antioxidative properties of Martynoside: Pulse radiolysis and laser photolysis study[J]. FREE RADICAL RESEARCH,2003,37(8):829.
APA Miao, JL,Wang, WF,Yao, S,Navaratnam, S,&Parsons, BJ.(2003).Antioxidative properties of Martynoside: Pulse radiolysis and laser photolysis study.FREE RADICAL RESEARCH,37(8),829.
MLA Miao, JL,et al."Antioxidative properties of Martynoside: Pulse radiolysis and laser photolysis study".FREE RADICAL RESEARCH 37.8(2003):829.
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