Grundy Myriam M-L, Quint Janina, Rieder Anne, Ballance Simon, Dreiss Cécile A, Butterworth Peter J, Ellis Peter R
Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, UK; Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK.
Department of Nutritional Sciences, University of Vienna, Althanstraße 14 (UZA II), 1090 Vienna, Austria.
Carbohydr Polym. 2017 Jun 15;166:387-397. doi: 10.1016/j.carbpol.2017.02.077. Epub 2017 Feb 22.
Oat mixed-linkage β-glucan has been shown to lower fasting blood cholesterol concentrations due notably to an increase in digesta viscosity in the proximal gut. To exert its action, the polysaccharide has to be released from the food matrix and hydrated. The dissolution kinetics of β-glucan from three oat materials, varying in their structure, composition and degree of processing, was investigated by incubating the oats at 37°C over multiple time points (up to 72h). The samples were analysed for β-glucan content, weight-average molecular weight and rheological behaviour. Regardless of the materials studied and the processing applied, the solubilisation of β-glucan was not complete. Mechanical and hydrothermal processing led to differences in the viscosity flow curves of the recovered solutions, with the presence of particulates having a marked effect. This study revealed that the structure and processing methods applied to oat materials resulted in varied and complex rheological properties, especially when particulates are present.
燕麦混合连接β-葡聚糖已被证明可降低空腹血液胆固醇浓度，这主要归因于近端肠道中食糜粘度的增加。为发挥其作用，多糖必须从食物基质中释放并水化。通过在37°C下将燕麦在多个时间点（长达72小时）孵育，研究了三种结构、组成和加工程度不同的燕麦材料中β-葡聚糖的溶解动力学。对样品进行了β-葡聚糖含量、重均分子量和流变行为分析。无论所研究的材料和应用的加工方式如何，β-葡聚糖的溶解都不完全。机械和水热处理导致回收溶液的粘度流动曲线存在差异，颗粒的存在具有显著影响。这项研究表明，应用于燕麦材料的结构和加工方法导致了多样且复杂的流变特性，尤其是当存在颗粒时。
