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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Effect of extraction procedures on structural, thermal and antioxidant properties of ulvan from Ulva lactuca collected in Monastir coast
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Effect of extraction procedures on structural, thermal and antioxidant properties of ulvan from Ulva lactuca collected in Monastir coast

机译：提取程序对蒙斯特河海岸Ulva Lactuca的Ulvan结构，热和抗氧化特性的影响

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摘要

The present work aims to evaluate the effect of an acid extraction as well as a combined enzymatic chemical extraction on structural, thermal and antioxidant properties of the sulphated polysaccharide 'ulvan' from the green seaweed Ulva lactuca. Structural characterization by FTIR and NMR spectroscopies showed the typical peaks of ulvan, namely, uronic acids, rhamnose and sulphate. FTIR analysis revealed that the extraction procedures were able to maintain ulvan structure. Despite differences in the extraction procedures,C-13 NMR spectra were globally similar, proving a comparable chemical structure of ulvans. A major difference has been observed in signal intensity which reflected the resonance of glucose or xylose. Thermal characterization proved that ulvans were thermally stable until approximately 180 degrees C. Antioxidant properties of ulvans were evaluated in vitro through different antioxidant assays. Ulvan, which is extracted at pH 1.5 and 90 degrees C, exhibited the greatest scavenging activity (IC50=13.56 mu g/ml) towards DPPH radical. Result indicated that Mw has influenced inhibitory effect on DPPH radical of ulvan. The current study revealed also a high correlation between sulphate contents of ulvans and their reducing power (R-2=-0.89) and their metal scavenging activity (R-2=0.97). Overall, ulvans have peculiar structural, thermal and antioxidant properties which promote their use in food or pharmaceutical products as natural ingredient. (C) 2017 Elsevier B.V. All rights reserved.
机译：目前的作品旨在评估酸提取的效果以及组合酶化学提取对绿色海藻ULVA乳酸的硫酸盐多糖'ULVAN'的结构，热和抗氧化特性的影响。 FTIR和NMR光谱的结构表征显示ULVAN，即尿酸，鼻窦和硫酸盐的典型峰。 FTIR分析表明，提取程序能够保持ULVAN结构。尽管提取程序存在差异，但C-13 NMR光谱是全球相似的，证明了ULVANS的可比化学结构。在信号强度中观察到主要差异，其反映了葡萄糖或木糖的共振。热表征证明，ULVANS热稳定，直至大约180℃。通过不同的抗氧化试验在体外评估ULVANS的抗氧化性能。在pH 1.5和90℃下提取的Ulvan表现出最大的清除活性（IC50 =13.56μg/ ml）朝向DPPH激进。结果表明，MW对ULVAN的DPPH激进的影响影响了抑制作用。目前的研究揭示了硫酸铀含量与其还原功率（R-2 = -0.89）的高相关（R-2 = -0.89）（R-2 = 0.97）。总体而言，ULVANS具有特殊的结构，热和抗氧化性能，可促进其在食品或药品中的用途作为天然成分。 （c）2017年Elsevier B.V.保留所有权利。

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