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Particle degradation and nutrient bioavailability of soybean milk during in vitro digestion
Food Biophysics ( IF 3 ) Pub Date : 2020-08-13 , DOI: 10.1007/s11483-020-09649-5
Qingqing Xu , Christos Ritzoulis , Jianzhong Han , Feifei Han , Weiping Jin , Weilin Liu

This work studies the structural breakdown and nutrient release during in vitro digestion of soybean milk reconstituted from soybean flour with different particle sizes (> 100 mesh, 50–100 mesh, 28–50 mesh, 14–28 mesh and < 14 mesh). A clear effect of the particle size is noticed on the functional characteristics of the colloidal food during the gastric and intestinal digestion stages. In vitro gastric digestion significantly improves the release of polyphenols (21.4 ± 1.1–35.6 ± 3.2%, compared with the undigested one). In that stage, the antioxidant capacity increases between 20.8–38.5%, and is related to the particle size, hence free surface area, of soybean flour. Confocal microscopy shows that the proteins released from the soybean flour particles aggregate during gastric digestion, while the lipid droplets decompose down into smaller colloidal entities. Examination of the effect of particle size on the release of phenolic compounds, small molecule proteins/peptides, and fatty acids, showed that the highest amounts of the above substances existed when the particle size of soybean flour lies in the region of 50–100 mesh. This particle size also shows the highest bioaccessibility of the contained bioactive substances (polyphenols, 124.5 ± 0.5%; flavonoids, 49.1 ± 1.5%). These findings add insight on the role of the colloidal properties of the soybean flour with different particle sizes on the functionality of soybean milk.



中文翻译:

豆浆体外消化过程中的颗粒降解和营养生物利用度

这项工作研究了用不同粒径(> 100目,50–100目,28–50目,14–28目和<14目)的豆粉重构的豆浆的体外消化过程的结构分解和养分释放。在胃和肠消化阶段,注意到粒度对胶体食品的功能特性有明显影响。体外胃消化可显着改善多酚的释放(与未消化的相比,多酚的释放率为21.4±1.1–35.6±3.2%)。在那个阶段,抗氧化能力增加了20.8-38.5%,并且与大豆粉的粒径有关,因此与自由表面积有关。共聚焦显微镜显示,从大豆粉颗粒释放的蛋白质在胃消化过程中会聚集,而脂滴则分解成较小的胶体。检查粒径对酚类化合物,小分子蛋白质/肽和脂肪酸释放的影响,结果表明,当大豆粉的粒径在50-100目范围内时,上述物质的含量最高。该粒径还显示了所含生物活性物质(多酚124)的最高生物可及性。5±0.5%;黄酮(49.1±1.5%)。这些发现增加了对具有不同粒径的大豆粉的胶体性质对豆浆功能的作用的认识。

更新日期:2020-08-14
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