Food Bioscience ( IF 4.8 ) Pub Date : 2020-08-12 , DOI: 10.1016/j.fbio.2020.100724 Pheakdey Yun , Sakamon Devahastin , Naphaporn Chiewchan
A spray-drying (SD) based method was proposed to prepare amylose-lipid powder complexes from high-amylose Thai rice flour and rice bran oil. Selected properties (moisture content, water activity, hygroscopicity, bulk density, X-ray diffraction pattern, thermal property and Fourier transform infrared spectrum), microstructure and in vitro digestion behavior of the powder prepared using different conditions (temperatures of 150 to 200°C and rice bran oil contents of 0, 10, 30 and 50% w/w) were compared with those of powder prepared using the conventional hot air drying (CV at 40°C) method. SD powders showed higher hygroscopicity values due to their smaller sizes. Added oil resulted in a porous structure for CV powder but hollow, dent and fused structures for SD powder; the latter structures led to lower bulk densities than CV powder. CV and SD powders showed similar melting temperatures and X-ray diffraction patterns. A higher drying temperature with SD, however, promoted formation of resistant starches and hence the lower digestion rate of the powder. SD powder prepared with no added oil at 150°C showed the lowest digestion rate as well as a moderate glycemic index value of 63 ± 5.
中文翻译:
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使用常规和喷雾干燥方法制备的直链淀粉-脂质粉末复合物的物理性质,微观结构和消化行为
提出了一种基于喷雾干燥( SD )的方法,该方法由高直链泰国米粉和米糠油制备直链淀粉-脂质粉末复合物。在不同条件下(温度为150至200°C)制备的粉末的选定特性(水分含量,水分活度,吸湿性,堆积密度,X射线衍射图,热特性和傅里叶变换红外光谱),微观结构和体外消化行为并将米糠油含量分别为0、10、30和50%w / w )与使用常规热风干燥( CV在40°C )制备的粉末进行比较方法。SD粉由于其较小的尺寸而显示出较高的吸湿值。添加油会导致CV粉末具有多孔结构,而SD粉末会形成中空,凹痕和熔融结构。与CV粉末相比,后者的结构导致较低的堆积密度。CV和SD粉末显示出相似的熔融温度和X射线衍射图。然而,使用SD的较高的干燥温度促进了抗性淀粉的形成,因此促进了粉末的较低的消化速率。在150°C时未添加油的SD粉末显示出最低的消化率以及63±5的中等血糖指数值。