The effects of high-pressure processing (HPP) at 550 MPa for 6 min and of high-temperature short-time (HTST)
processing at 110 °C for 8.6 s on carrot juice were evaluated. After HPP and HTST, the total plate count (TPC) was
found to significantly decrease by 4.30 and 4.88 log10 CFU/mL, respectively, and yeasts and molds (Y&M) were
completely inactive. HPP-treated juice showed higher carotenoids, polyphenols, antioxidant capacity, viscosity,
turbidity, and lower browning degrees (BDs) than HTST-treated juice, while HTST-treated juice contained
higher polyacetylenes. HPP provided a more fresh-like quality and exhibited better aroma, taste, and overall
acceptability. During 20 days of storage at 4 °C, both HPP- and HTST-treated juices were microbiologically safe
(i.e., TPC b 2.4 log10 CFU/mL, and Y&M were not detected), and their antioxidant capacities decreased linearly
due to a decrease in carotenoid and polyphenol contents. The two juices did not precipitate any solids when
their particle sizes decreased, and their viscosity increased; however, their organoleptic properties deteriorated
as storage time increased.
Industrial Relevance: This study was intended to develop fresher and more stable carrot juice, which is not
available on the market now. Acid blanching for a proper time was proved as an effective process in preventing
juice serum isolation phenomenon of HPP juice, which is more likely to be accepted by consumers. HPP-treated
juice had an advantage in nutritional and organoleptic properties than HTST-treated juice. This study provided a
comprehensive technical support for novel application of HPP in carrot juice processing
The effects of high-pressure processing (HPP) at 550 MPa for 6 min and of high-temperature short-time (HTST)processing at 110 °C for 8.6 s on carrot juice were evaluated. After HPP and HTST, the total plate count (TPC) wasfound to significantly decrease by 4.30 and 4.88 log10 CFU/mL, respectively, and yeasts and molds (Y&M) werecompletely inactive. HPP-treated juice showed higher carotenoids, polyphenols, antioxidant capacity, viscosity,turbidity, and lower browning degrees (BDs) than HTST-treated juice, while HTST-treated juice containedhigher polyacetylenes. HPP provided a more fresh-like quality and exhibited better aroma, taste, and overallacceptability. During 20 days of storage at 4 °C, both HPP- and HTST-treated juices were microbiologically safe(i.e., TPC b 2.4 log10 CFU/mL, and Y&M were not detected), and their antioxidant capacities decreased linearlydue to a decrease in carotenoid and polyphenol contents. The two juices did not precipitate any solids whentheir particle sizes decreased, and their viscosity increased; however, their organoleptic properties deterioratedas storage time increased.Industrial Relevance: This study was intended to develop fresher and more stable carrot juice, which is notavailable on the market now. Acid blanching for a proper time was proved as an effective process in preventingjuice serum isolation phenomenon of HPP juice, which is more likely to be accepted by consumers. HPP-treatedjuice had an advantage in nutritional and organoleptic properties than HTST-treated juice. This study provided acomprehensive technical support for novel application of HPP in carrot juice processing
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