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首页> 外文期刊>Carbohydrate Polymers: Scientific and Technological Aspects of Industrially Important Polysaccharides >Morphological and structural study of seed pericarp of Opuntia ficus-indica prickly pear fruits
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Morphological and structural study of seed pericarp of Opuntia ficus-indica prickly pear fruits

机译：仙人掌-印度仙人掌果种子果皮的形态结构研究

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The morphological study of pericarp of Opuntia ficus-indica (OFI) seeds showed that the cells were mainly made up of spindle-shaped sclerenchyma fibers. The chemical composition of the pericarp revealed a significant amount of polysaccharides, with cellulose (35%) and xylan (27%). The structure of xylan and cellulose, both in isolated form and as a component of seed pericarp of OFI were studied by X-ray and CP/MAS ~(13)C NMR spectroscopy. The supramolecular structure of xylan is very sensitive to the surrounding environment, in particular to the presence of water and of cellulose fibers. The cellulose fibers presented X-ray diagrams typical of secondary wall cellulose but they were sensitive toward NaOH since they started to be converted into cellulose II at a NaOH concentration as low as 8%.In seed pericarp, cellulose fibers interact with xylan polymers, causing these to adopt a conformation different to the one observed for xylan both in dry or hydrated form, suggesting that xylans were probably present as composites with cellulose fibers.
机译：仙人掌（Omuntia ficus-indica）种子果皮的形态学研究表明，这些细胞主要由纺锤形的巩膜纤维组成。果皮的化学成分显示出大量的多糖，其中纤维素（35％）和木聚糖（27％）。通过X射线和CP / MAS〜（13）C NMR光谱研究了分离的形式和作为OFI的种子果皮成分的木聚糖和纤维素的结构。木聚糖的超分子结构对周围环境非常敏感，特别是对水和纤维素纤维的存在。纤维素纤维具有典型的次级壁纤维素的X射线图，但由于对NaOH敏感，因为它们开始以低至8％的NaOH浓度转化为纤维素II。在种子果皮中，纤维素纤维与木聚糖聚合物相互作用，导致这些具有与以木聚糖形式观察到的干燥或水合形式不同的构象，表明木聚糖可能以与纤维素纤维的复合物形式存在。

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