Preparation and properties of octenyl succinic anhydride modified early indica rice starch
Preparation and properties of octenyl succinic anhydride modified early indica rice starch
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DOI：
10.1002/star.200500444
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发表时间：
2006-02-01
期刊：
影响因子：
2.3
通讯作者：
Chen, QH
中科院分区：
文献类型：
--
作者：
Song, XY;He, GQ;Chen, QH
以早籼米淀粉为原料，采用油浆法制备了辛烯基琥珀酸酐（OSA）改性早籼米淀粉，并对影响OSA改性早籼米淀粉酯化反应的主要因素进行了系统研究。采用傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）、X射线衍射（XRD）和快速粘度分析仪（RVA）对产物的理化性质进行了表征。结果表明，以早籼米淀粉为原料，采用水浆法制备OSA淀粉的最佳工艺条件为：淀粉浆浓度35%（质量比），反应时间4 h，反应体系pH值8.5，反应温度35 ℃，OSA用量3%（质量比）。取代度（DS）为0.018，反应效率（RE）为78%。FT-IR光谱显示OSA淀粉中酯羰基在1724 cm（-1）处的特征吸收。扫描电镜和X-射线衍射分析表明，OSA基团首先攻击淀粉表面，形成了一些微孔，但OSA改性对取代度为0.046的大米淀粉的晶型没有影响。RVA结果表明，随着OSA改性的增加，淀粉衍生物在较短的时间内糊化以获得较高的粘度。
Octenyl succinic anhydride (OSA) modified early indica rice starch was prepared in aqueous slurry systems and the major factors affecting the esterification were investigated systematically. The physicochemical properties of the products were determined by means of Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction and Rapid Visco Analyser (RVA). The results indicated that the suitable parameters for the preparation of OSA starch from early indica rice starch in aqueous slurry systems were as follows: concentration of starch slurry 35% (in proportion to water, w/w), reaction period 4 h, pH of reaction system 8.5, reaction temperature 35 degrees C, amount of OSA 3% (in proportion to starch, w/w). The degree of substitution (DS) was 0 018 and the reaction efficiency (RE) was 78%. FT-IR spectroscopy showed characteristic absorption of the ester carbonyl groups in the OSA starch at 1724 cm(-1). SEM and X-ray diffraction revealed that OSA groups acted by first attacking the surface and some pores formed, but OSA modification caused no change in the crystalline pattern of rice starch up to DS 0.046. RVA results indicated that the starch derivatives gelatinized at shorter time to achieve higher viscosities with increased OSA modification.