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Carbohydrate polymers of chirata (Swertia chirata) leaves: Structural features, in vitro anti-oxidant activity and fluorescence quenching study

机译:Chirata(Swertia chirata)叶片的碳水化合物聚合物:结构特征,体外抗氧化活性和荧光猝灭研究

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Chirata (Swertia chirata) is widely used in Indian folk medicine for the prevention of various disorders. Herein, we analyzed the water-extracted carbohydrate polymer (WECP) of this herb using chemical, chromatographic, and spectroscopic methods. The anti-oxidant capacity of this fraction was studied by ferric reducing anti-oxidant power (FRAP) and DPPH radical assays. Effect of WECP on bovine serum albumin spectrum (BSA) was determined using excitation wavelength of 282 nm. Anion exchange chromatography of WECP yielded 5 fractions (F1–F5) with different chemical compositions. The major fraction (F5) was homogeneous, had an apparent molecular mass of 4.5 kDa, and contains both carbohydrates (57%) and phenolics (34%). The anti-oxidant capacities of WECP and F5 were comparable to standard anti-oxidants. Notably, activities of the carbohydrate polymers (F1–F5) correlate with their phenolics content. Fluorescence quenching measurement suggests that F5 can form complex with BSA and the value of the binding constant is K=6.28×105/M.
机译:Chirata(Swertia chirata)在印度民间医学中广泛用于预防各种疾病。在这里,我们使用化学,色谱和光谱方法分析了这种草药的水分提取碳水化合物聚合物(WECP)。通过三价铁还原抗氧化能力(FRAP)和DPPH自由基测定法研究了该级分的抗氧化能力。使用282 nm的激发波长确定WECP对牛血清白蛋白光谱(BSA)的影响。 WECP的阴离子交换色谱可得到5个具有不同化学组成的馏分(F1-F5)。主要部分(F5)是均质的,具有4.5 kDa的表观分子量,并且同时包含碳水化合物(57%)和酚类(34%)。 WECP和F5的抗氧化能力与标准抗氧化剂相当。值得注意的是,碳水化合物聚合物(F1-F5)的活性与其酚含量有关。荧光猝灭测定表明,F5可以与BSA形成复合物,结合常数为K = 6.28×105 / M。

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