Effects of shear emulsifying/ball milling/autoclave modification on structure, physicochemical properties, phenolic compounds, and antioxidant capacity of lotus (Nelumbo) leaves dietary fiber

Abstract

Lotus (Nelumbo) leaves are rich in polyphenols and dietary fiber, which have the potential as a high-quality fiber material in functional food. However, lotus leaves exhibit dense structure and poor taste, it is vital to develop appropriate modification methods to improve the properties of lotus leaves dietary fiber. In this study, the effects of three modification methods with shear emulsifying (SE), ball milling (BM), and autoclave treatment (AT) on structure, physicochemical properties, phenolic compounds, and antioxidant capacity of lotus leave dietary fiber (LDF) were evaluated. SEM indicated that there were significant differences in the microstructure of modified LDFs. FT-IR spectra and X-ray diffraction pattern of modified LDFs revealed similar shapes, while the peak intensity and crystalline region changed by modification. SE showed the greatest effect on crystallization index. SE-LDF had the highest water holding capacity, water swelling capacity, and bound phenolic content in LDFs, which increased by 15.69, 12.02, and 31.81%, respectively, compared with the unmodified LDF. BM exhibited the most dramatic effect on particle size. BM-LDF had the highest free phenolic and total phenolic contents in LDFs, which increased by 32.20 and 29.05% respectively, compared with the unmodified LDF. Phenolic compounds in LDFs were mainly free phenolic, and modifications altered the concents of flavonoids. The BM-LDF and SE-LDF exhibited higher antioxidant capacity than that of AT-LDF. Overall, SE-LDF showed better physical properties, and BM-LDF showed better bioactive components. SE and BM were considered to be appropriate modification methods to enhance the properties of LDF with their own advantages.

Effect of modified okara insoluble dietary fibre on the quality of yoghurt

“… Zhu et al (2022) reported similar results. However, the co-modified M−IDF OHC was still higher than that of the shear emulsification-treated Lotus leaf DF (3.73 ± 0.17 g/g) ( Zheng et al, 2023 ). Furthermore, The SC of M−IDF (16.98 ± 0.4 g/g) was significantly higher than that of F-IDF (8.11 ± 0.11 g/g), the increase in the SC of M−IDF could be attributed to its numerous complex porous structures, which facilitate the entry of water molecules into the cellulose interior and prevent their escape.…”

Effects of Four Extraction Methods on Structure and In Vitro Fermentation Characteristics of Soluble Dietary Fiber from Rape Bee Pollen

“…The method was based on our previous study [ 63 ]. The extract solution (100 μL) was mixed with 7.9 mL of distilled water and 500 μL of Folin–Ciocalteu reagent, then after 5 min, 1.5 mL of 20% ( w / v ) sodium carbonate solution was added.…”

Influence of Three Modification Methods on the Structure, Physicochemical, and Functional Properties of Insoluble Dietary Fiber from Rosa roxburghii Tratt Pomace

“…The combination force between FP and the plant cell wall matrix is relatively weak, allowing them to be readily released in the upper digestive tract, thereby exerting health-promoting effects. Conversely, BP forms a strong bond with the plant cell wall matrix, resisting digestion in the stomach and small intestine, and ultimately reaching the lower gastrointestinal tract of humans, where it is released from the plant cell wall matrix and further fermented into phenolic acid by intestinal microbiota, contributing to the formation of an antioxidant environment [33]. As shown in Table 3, after modification, the contents of FP, BP, and TP of RIDFs were significantly reduced, all of which decreased the FPC value most significantly.…”