College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
Food Chem. 2025 Feb 1;464(Pt 1):141597. doi: 10.1016/j.foodchem.2024.141597. Epub 2024 Oct 9.
The health effects of dietary fiber have been widely concerned, which are closely related to physicochemical properties. This study focused on soluble dietary fiber of Flammulina velutipes (FDF), evaluated the effects of modifications on structural characterization, the physicochemical properties and the heavy metal adsorption characteristics, and further clarified underlying mechanisms on Pb adsorption behavior of FDFs. The results showed the modifications of extrusion and cellulase improved the yield of FDFs, increased the release of active groups and enhanced the adsorption ability in vitro. Besides, Pb adsorption altered porous structure and led to the presence of carboxylate. It was a spontaneous endothermic reaction and can be fitted by the pseudo-second-order kinetic equation. The Freundlich equation was suitable to describe the adsorption isotherm. These results highlighted potential applications of the dietary fiber modification and laid the theoretical foundation for the modification processing of F. velutipes and protection from food-derived heavy metal toxicity.
膳食纤维的健康影响受到广泛关注，这与其物理化学性质密切相关。本研究聚焦于金针菇（FDF）的可溶性膳食纤维，评估了修饰对结构特征、物理化学性质和重金属吸附特性的影响，并进一步阐明了 FDFs 对 Pb 吸附行为的潜在机制。结果表明，挤压和纤维素酶修饰提高了 FDF 的产率，增加了活性基团的释放，增强了体外吸附能力。此外，Pb 的吸附改变了多孔结构并导致了羧酸盐的存在。这是一个自发的吸热反应，可以用伪二级动力学方程来拟合。Freundlich 方程适合描述吸附等温线。这些结果突出了膳食纤维修饰的潜在应用，为金针菇的修饰加工和防止食物来源的重金属毒性奠定了理论基础。
