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Comparative effects of high hydrostatic pressure versus thermal processing on quality attributes and volatile
Xuehua Wang1,2, Cuifang Liu1, Ye Zheng1
1School of Modern Industry for Selenium Science and Engineering, National R&D Center for Se-Rich Agricultural Products Processing, Hubei Engineering Research Center for Deep Processing of Green Se-Rich Agricultural Products, Wuhan Polytechnic University, Wuhan 430023, PR China.
Abstract:
High hydrostatic pressure (HHP) is a commercial non-thermal technology for fruit juice, but the interactive effects of prior evaporation concentration and subsequent HHP pasteurization on juice quality have not been systematically evaluated. In this study, the effects of HHP and thermal processing on quality attributes and volatile compounds of both non-concentrated and concentrated tomato juice were comprehensively investigated using HPLC, LC-MS, and GC-MS. The results demonstrated that thermal processing caused significantly greater degradation of color, all-trans-lutein, all-trans-β-carotene, and ascorbic acid than HHP in both juice types. By contrast, total lycopene, total phenols, and caffeic acid remained stable across all processing conditions. Furthermore, the concentration step significantly altered the volatile profile of tomato juice and exerted a cumulative effect on the changes induced by subsequent HHP or HTST treatment. Collectively, these findings confirm that HHP offers distinct advantages for lightly concentrated tomato juice, thereby providing a theoretical basis for its production.
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