Structural barriers governing starch digestibility in intact highland barley cells: A closer insight from cell wall and protein matrix
文献类型： 外文期刊
作者： Chen, Xiaoyu 1 ; Zhu, Ling 1 ; Zhang, Hui 1 ; Zhang, Yayuan 2 ; Cheng, Lilin 3 ; Wu, Gangcheng 1 ;
作者机构： 1.Jiangnan Univ, Natl Engn Res Ctr Funct Food, Collaborat Innovat Ctr Food Safety & Qual Control, Sch Food Sci & Technol, Wuxi 214122, Peoples R China
2.Guangxi Acad Agr Sci, Agrofood Sci & Technol Res Inst, Nanning, Peoples R China
3.Henan Agr Univ, Coll Food Sci & Technol, Zhengzhou 450002, Henan, Peoples R China
关键词： Intact endosperm cells; Structural barriers; Cell wall; Protein matrix; Starch digestibility
期刊名称：CARBOHYDRATE POLYMERS （ 影响因子：12.5； 五年影响因子：11.9 ）
ISSN： 0144-8617
年卷期： 2025 年 348 卷
页码：
收录情况： SCI
摘要： The endosperm cell structure plays an important role in starch digestion. This study aimed to evaluate the effects of the structural properties of the cell wall and protein matrix on starch digestibility in intact cells isolated from the endosperm of highland barley. Damaged cells with different degree of cell wall degradation were obtained by controlling the time of (3-glucanase hydrolysis of isolated cells. Intact cells exhibited the lowest starch digestibility (61.80 %) and gelatinization enthalpy change (3.55 J/g). As the degree of (3-glucanase hydrolysis increased, the starch digestibility of damaged cells markedly increased and was close to that of mechanically crushed flour. Penetration of amylase-sized fluorescent probes showed that the probes barely penetrated the raw and cooked cell walls, indicating that the cell wall strongly blocked the contact between amylase and starch. Additionally, the compound network formed by the protein matrix and expanded starch hindered probe diffusion. However, the starches in the cells with the greatest cell wall loss were fully digested after 6 h of digestion. Therefore, the cell wall, an effective structural barrier to amylase, mainly limits starch digestibility, whereas the protein matrix/network acts as a secondary barrier. This study provides new insights into the processing of slowdigested cereals.
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