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首页> 美国卫生研究院文献>Molecules >Antioxidant and Fluorescence Properties of Hydrogenolyzised Polymeric Proanthocyanidins Prepared Using SO42−/ZrO2 Solid Superacids Catalyst
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Antioxidant and Fluorescence Properties of Hydrogenolyzised Polymeric Proanthocyanidins Prepared Using SO42−/ZrO2 Solid Superacids Catalyst

机译：SO42- / ZrO2固体超强酸催化剂制备的氢解聚合物原花青素的抗氧化和荧光性质

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摘要

Larix bark oligomeric proanthocyanidins (LOPC) were prepared from larix bark polymeric proanthocyanidins (LPPC) by catalytic hydrogenolysis using SO42−/ZrO2 solid superacid as the catalyst. The catalyst to polymeric proanthocyanidins ratio was 0.2:1 (m/m). The LOPC, obtained after hydrogenolysis at 100 °C for 4 h under 3 MPa hydrogen pressure, retained the structural characteristics of proanthocyanidins. The average degree of polymerization was reduced from 9.50% to 4.76% and the depolymerization yield was 53.85%. LOPC has good antioxidant properties and, at the same concentration, the reducing ability of LOPC was much higher than that of LPPC. The IC50 values of LOPC for scavenging DPPH• and ABTS•+ radicals were 0.046 mg/mL and 0.051 mg/mL, respectively. LOPC is biocompatible and has fluorescent properties that are affected by external factors, such as solvent polarity, pH and the presence of different metal ions. These features indicate that LOPC could be developed as a new biological fluorescent marker. The depolymerization of low-value polymeric proanthocyanidins to provide high-value oligomeric proanthocyanidins and the development of new applications for proanthocyanidins represent significant advances.
机译：落叶松树皮低聚原花青素（LOPC）是由落叶松树皮多聚原花色素（LPPC）经SO 2 2- / srO2固体超强酸为催化剂催化氢解而制得的。催化剂与聚合物原花色素的比例为0.2：1（m / m）。 LOPC在3 MPa氢气压力下于100°C氢解4 h后获得，保留了原花色素的结构特征。平均聚合度从9.50％降低到4.76％，解聚产率为53.85％。 LOPC具有良好的抗氧化性能，在相同浓度下，LOPC的还原能力远高于LPPC。清除DPPH •和ABTS •+ 自由基的LOPC的IC50值分别为0.046 mg / mL和0.051 mg / mL。 LOPC具有生物相容性，并具有受外部因素（例如溶剂极性，pH和不同金属离子的存在）影响的荧光性质。这些特征表明，LOPC可以被开发为一种新的生物荧光标记。低值聚合原花青素的解聚以提供高价值的低聚原花青素，并且原花青素的新应用的开发代表了重要的进展。

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