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High pressure processing and thermal pasteurization of strawberry purée: quality parameters and shelf life evaluation during cold storage

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Abstract

This study was aimed at monitoring changes in the quality of strawberry purée preserved by high pressure processing (HPP) and thermal pasteurization (TP) during cold storage (6 °C) and determining its optimal storage period. The storage period of strawberry purée treated at 500 MPa, 50 °C, 15 min based on microbiological changes was 12 weeks. During this period, purée lost 32% of polyphenols, 73% of anthocyanins and entire vitamin C. Color changes described as dE increased up to 5.05 whereas the overall sensory quality decreased by 3 points on a 9-point scale. Under similar storage conditions, TP-preserved purée lost only 28% of polyphenols and 54% of anthocyanins, and entire vitamin C. Color changes were more visible (dE = 7.21) compared to the HPP sample whereas the overall sensory quality decreased only by 2 points. Recommended cold shelf-life for the HPP product was estimated at 6 weeks, during which period HPP-preserved purée had higher content of polyphenols and colour parameters compared to TP purée.

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Acknowledgements

The Project was financed from funds of National Research Center (Grant No. NN 312 252540), and co-financed from European Union funds under the European Social Fund (Contract No. 78/ES/ZS-II/W-2151.1/11). Authors would like to thank Prof. Monika Fonberg-Broczek (UNIPRESS, Poland) for the possibility of using a pressure cabinet.

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Correspondence to Krystian Marszałek.

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Marszałek, K., Woźniak, Ł., Skąpska, S. et al. High pressure processing and thermal pasteurization of strawberry purée: quality parameters and shelf life evaluation during cold storage. J Food Sci Technol 54, 832–841 (2017). https://doi.org/10.1007/s13197-017-2529-4

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  • DOI: https://doi.org/10.1007/s13197-017-2529-4

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