Abstract
The insoluble dietary fibers from Pholiota nameko (PN-IDFs) was extracted using the enzyme method with crude fiber content of 87.02 ± 1.68 g/100 g. PN-IDFs had moisture content of 4.96 ± 0.33 g/100 g, ash content of 2.65 ± 0.15 g/100 g, protein content of 3.22 ± 0.51 g/100 g and had strong absorption capacity, including swelling capacity (24.09 ± 1.13 g/g), water-holding capacity (28.22 ± 1.26 g/g) and oil-holding capacity (4.65 ± 0.68 g/g). Scanning electron microscope, Fourier transform infrared spectroscopy and atomic force micrograph suggested that PN-IDFs had the typical structures of multi-ball-aggregate-like shape and polysaccharide functional groups. PN-IDFs exhibited notable cholesterol adsorption both at pH 2.0 and pH 7.0, as well as sodium cholate adsorption. In addition, PN-IDFs displayed strong radical scavenging activities for superoxide anion, hydroxyl radical and DPPH, as well as significant inhibition of α-glucosidase. The results suggested that PN-IDFs could be used as a potentially functional dietary fiber ingredient in food processing.
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Abbreviations
- D10:
-
Smallest particle diameter
- D50:
-
Mean particle diameter
- D90:
-
Largest particle diameter
- DCs:
-
Dendritic cells
- CL:
-
Chemiluminescence
- DF:
-
Dietary fiber
- FTIR:
-
Fourier-transform infrared
- HPLC:
-
High performance liquid chromatography
- IDF:
-
Insoluble dietary fiber
- NMR:
-
Nuclear magnetic resonance
- OPA:
-
ο-Phthaladehyde
- PnPG:
-
P-nitrophenyl-α-D-glucopyranoside
- PNPS:
-
Pholiota nameko Polysaccharides
- SC:
-
Swelling capacity
- SD:
-
Standard deviation
- SDF:
-
Soluble dietary fiber
- SEM:
-
Scanning electron microscopy
- TLR:
-
Toll-like receptor
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Acknowledgements
This research was supported by the national natural science foundation of China. Also, this work was supported by the grant of National College Students' Science and Technology Innovation Project of China (Grant No. 201710069002, 201810069007, 201910069002), and by the grant of Tianjin Postgraduate Students' Science and Technology Innovation Project of China, and by the natural science foundation of Tianjin.
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Li, H., Zhao, P., Zhuo, S. et al. Structural characterization, free radical scavenging activity and α-glucosidase inhibitory activity of insoluble dietary fiber from Pholiota nameko. Food Measure 16, 3062–3076 (2022). https://doi.org/10.1007/s11694-022-01409-y
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DOI: https://doi.org/10.1007/s11694-022-01409-y