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Three varieties of sweetpotato flour (Orange Sunset (OS), Purple Dawn (PD), and Red) were treated by high hydrostatic pressure (HHP). Thermal analysis showed that complete starch gelatinization occurred in PD and Red subjected to 600 MPa. Starch of OS was partially gelatinized at 600 MPa. The pressure of 600 MPa caused significant decreases in peak viscosity, breakdown and setback, and an increase in pasting temperature. Compared with native samples, HHP-treated samples showed higher in vitro starch digestibility in uncooked conditions but lower digestibility in cooked conditions. HHP significantly improved the extractability of bioactive compounds from sweetpotato flour. The changes in β-carotene content, total phenolic content, in vitro antioxidant activities, individual phenolic acids, and anthocyanins profiles were investigated. This study suggests the potential of HHP as a non-thermal processing tool to modify the functional properties of sweetpotato flour.
This article was published in the following journal.
Name: Food chemistry
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