欢迎访问云南西力生物技术股份有限公司!证券代码:871574
首页 成 果 源于西力产品的客户论文
π-π Conjugation Enhances Oligostilbene’s Antioxidant Capacity: Evidence from α-Viniferin and Caraphenol A. Molecules, 2018, 23: 694.
发布时间:2019-04-24 阅读数:1731 来源:Molecules
分享到:

Abstract:

α-Viniferin and caraphenol A, the two oligostilbenes, have the sole difference of the presence or absence of an exocyclic double bond at the π-π conjugative site. In this study, the antioxidant capacity and relevant mechanisms for α-viniferin and caraphenol A were comparatively explored using spectrophotometry, UV-visible spectral analysis, and electrospray ionization quadrupole time-of-flight tandem mass spectrometry (UPLC–ESI–Q–TOF–MS/MS) analysis. The spectrophotometric results suggested that caraphenol A always gave lower IC50 values than α-viniferin in cupric ion-reducing antioxidant capacity assay, ferric-reducing antioxidant power assay, 1,1-diphenyl-2-picryl-hydrazl radical (DPPH●)-scavenging, and 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide radical-scavenging assays. In UV-visible spectra analysis, caraphenol A was observed to show enhanced peaks at 250–350 nm when mixed with Fe(2+), but α-viniferin exhibited no similar effects. UPLC–ESI–Q–TOF–MS/MS analysis revealed that α-viniferin mixed with DPPH● produced radical adduct formation (RAF) peak (m/z = 1070–1072). We conclude that the antioxidant action of α-viniferin and caraphenol A may involve both redox-mediated mechanisms (especially electron transfer and (H+)-transfer) and non-redox-mediated mechanisms (including Fe(2+)-chelating or RAF). The π-π conjugation of the exocyclic double bond in caraphenol A can greatly enhance the redox-mediated antioxidant mechanisms and partially promote the Fe(2+)-chelating mechanism. This makes caraphenol A far superior to α-viniferin in total antioxidant levels.


ewm.jpg 微信公众号
11.jpg 移动官网
特别声明:禁止在未经同意情况下转载本网站信息,BioBioPha品牌产品均由西力生物独家生产与销售,仅用于科学研究或企业研发!
版权所有 2024-2025 云南西力生物技术股份有限公司 BioBioPha 滇ICP备09000810号-1滇公安备案号 53019002000069号
技术支持:奥远科技

联系客服