作物学报 ›› 2010, Vol. 36 ›› Issue (11): 1998-2003.doi: 10.3724/SP.J.1006.2010.01998
陆大雷,郭换粉,董策,陆卫平*
LU Da-Lei,GUO Huan-Fen,DONG Ce,LU Wei-Ping*
摘要: 以8个糯玉米品种为材料,利用激光衍射粒度分析仪和差示扫描量热仪分析了春播和秋播糯玉米淀粉粒分布和热力学特性。结果表明,糯玉米淀粉主要由直径<13 μm的颗粒组成,占总数目的71.7%~84.3%。颗粒体积和表面积呈双峰分布,>17 μm颗粒占比例最高,9~13 μm颗粒占比例较高,<9 μm颗粒占比例最低。和春播相比,秋播处理使糯玉米粉中<17 μm颗粒体积和表面积比例升高,>17 μm颗粒体积和表面积比例降低,<9 μm的颗粒数目增多,>9 μm颗粒数目减少。淀粉热力学特征参数中,秋播处理下转变温度(起始温度、峰值温度和终值温度)、峰值指数和回生值降低,糊化范围扩大,但热焓值总体上无显著变化。结合前期研究结果,9~13 μm和13~17 μm颗粒体积比例与淀粉的结晶度、峰值黏度和崩解值显著正相关,与峰值温度和回生值显著负相关。>17 μm颗粒体积比例与结晶度、峰值黏度和崩解值极显著负相关,与峰值温度和回生值显著正相关。糯玉米淀粉粒分布在不同季节下不同,导致淀粉糊化特性和热力学特性发生变化。
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