采用偏光显微镜、扫描电子显微镜、激光粒度分布分析仪和X射线衍射仪研究高直链玉米淀粉的颗粒形貌与结构.结果表明,高直链玉米淀粉具有十字偏光现象;颗粒形态圆滑、形状多样,大多为近似椭圆形、少数呈细长条等特殊形和无规则形,大多数颗粒表面有多个乳状突起,少数颗粒表面有孔洞或裂口,极少数颗粒表面的局部有裂纹,颗粒为"实心";颗粒粒径为3.5μm～30.0μm,平均粒径为10.2μm;颗粒晶型结构为B型,结晶度为21%.高直链玉米淀粉的颗粒形貌、晶型结构不同于普通玉米淀粉.
High-amylose maize starch with amylose content 53% was investigated at the starch granule morphology and structure.The results show that the granules have Maltese cross.The granules are polymorphic, but tend to have a relatively round and smooth appearance.Most granules shapes are undefined oval, a few of granules shapes are specific such as elongated rod-like, while some granules exhibit their shapes irregularly.There exit several papillary protrusions on the most granules surface, some holes on a few of granules and some fractures too.Each individual granule is solid.The granules are with a narrow size ranging from 3.5 μm to 30 μm in diameter, average size 10.2 μm.High-amylose starch displays B-type pattern, its crystallinity is 21%.The granule morphology and structure of high-amylose maize starch are different from those of normal maize starch.
参考文献
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