不同分子量辛烯基琥珀酸蜡质玉米淀粉酯的制备及其性能

Preparation and Properties of Octenyl Succinic Anhydride Esterified Waxy Corn Starches with Different Molecular Weights

以蜡质玉米淀粉为原料,辛烯基琥珀酸酐(OSA)为酯化剂,β-淀粉酶为酶解剂,制备了不同分子量辛烯基琥珀酸蜡质玉米淀粉酯(OSAS),并测定了其理化特性。结果表明:不同分子量(1.0×104~2.0×105 Da)OSAS的黏度在0.0035~0.0010 Pa·s范围内随分子量下降显著(P<0.05)降低,糊透明度自28.6%降低至23.1%,凝沉性和膨胀度也均随分子量降低而下降;辛烯基琥珀酸酐对蜡质玉米淀粉的酯化作用主要发生在蜡质玉米淀粉颗粒表面,酶解处理不会引入新基团。本研究初步揭示了OSAS分子量与其理化性质间的相互关系。

Octenyl succinic anhydride esterified waxy corn starches(OSAS)with different molecular weights were prepared by using waxy corn starch as a raw material,octenyl succinic anhydride(OSA)as an esterifying agent,β-amylase as an enzymolysis reagent.And its physicochemical properties were also determined.The results showed that OSAS with different molecular weights(1.0×104~2.0×105 Da)viscosity within the range of 0.0035~0.0010 Pa·s decreased significantly(P<0.05)as the molecular weights decreasing,the paste transparency decreased from 28.6%to 23.1%.The retrogradation and swelling degree of OSAS were also decreased with the reduction in molecular weights.It revealed that the esterification of waxy corn starch with succinic anhydride occurred mainly on surface of the starch granules,and new groups would not be introduced by the enzymatic treatment.This study initially revealed the relationship between the molecular weight of OSAS and its physicochemical properties.