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. 2023 Aug 7:19:100829.
doi: 10.1016/j.fochx.2023.100829. eCollection 2023 Oct 30.

Improving the quality of soluble dietary fiber from Poria cocos peel residue following steam explosion

Tianlin Wang  1 , Zhongshan Xiao  2 , Tiange Li  1 , Ge Guo  1 , Suyun Chen  3 , Xianqing Huang  1
Affiliations

Improving the quality of soluble dietary fiber from Poria cocos peel residue following steam explosion

Tianlin Wang et al. Food Chem X. .

Abstract

Poria cocos peel residue (PCPR) still contains much soluble dietary fiber (SDF), steam explosion (SE) treatment was applied to PCPR to create a superior SDF. Steam pressure of 1.2 MPa, residence period of 120 s, and moisture content of 13% were the optimized parameters for SE treatment of PCPR. Under optimized circumstances, SE treatment of PCPR enhanced its SDF yield from 5.24% to 23.86%. Compared to the original SDF, the SE-treated SDF displayed improved enzyme inhibition, including the inhibition of α-amylase and pancreatic lipase, also enhanced water holding, oil holding, water swelling, nutrient adsorption including cholesterol, nitrite ions, and glucose and antioxidant abilities. Additionally, it had a decreased molecular weight, improved thermal stability, and a rough surface with many pores of different sizes. Given that SDF had been improved physiochemical and functional characteristics thanks to SE treatment, it might be the excellent functional ingredient for the food business.

Keywords: Poria cocos peel residue; Soluble dietary fiber; Steam explosion.

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Conflict of interest statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Figures

Fig. 1
Fig. 1
SE parameter effects on SDF yield. (A) PCPR treated by SE at different steam pressures for 120 s and 11% moisture, (B) PCPR treated by SE at 1.2 MPa and 11% moisture at different residence times, (C) PCPR treated by SE at 1.2 MPa and 120 s at different moisture contents. Different letters indicate significant differences (p < 0.05).
Fig. 2
Fig. 2
SE parameters effect on WSC, OHC and WHC in SE-SDF and O-SDF. Different letters indicate significant differences (p < 0.05).
Fig. 3
Fig. 3
SE parameters effect on CAC and GAC (A), NIAC (B), SA-HR (C), SA-DPPHR (D) in SE-SDF and O-SDF. Different letters indicate significant differences (p < 0.05).
Fig. 4
Fig. 4
The SEM of O-SDF (A) and SE-SDF (B) from PCPR.
Fig. 5
Fig. 5
The thermal analysis of O-SDF (2) and SE-SDF (1) from PCPR.
Fig. 6
Fig. 6
The molecular weight distributions of O-SDF and SE-SDF from PCPR. Different letters indicate significant differences (p < 0.05). Mw: Weight-average molecular weight; Mn: Number-average molecular weight.
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