Abstract
Physical properties, microbiological quality and volatile compounds of sous-vide-processed carrots and Brussels sprouts were analysed after 1, 5 and 10 days of refrigerated storage. Similar analyses were performed on raw and steamed carrots and Brussels sprout for comparison. Sous-vide carrots were firmer than steamed and firmness increased during storage. Similar values of colour indices were obtained for both steamed and sous-vide carrots, which also showed an increase of redness and colour saturation during storage. Aerobic and anaerobic counts of raw carrots were significantly reduced both by steaming and sous-vide procedures at values lower than 1 log cfu/g; these values were maintained until the end of storage. Among volatiles, terpenes were better preserved in sous-vide than steamed carrots, but all volatile fractions were significantly affected during storage. Steamed Brussels sprouts were softer and greener than sous-vide-processed ones, but softening and loss of green of the latter increased under vacuum storage. Microbiological counts of raw products were more efficiently reduced by sous-vide procedures than steaming. Higher amounts of nitriles and terpenes were shown in sous-vide vegetables in comparison to steamed, whereas thiocyanates and isothiocyanates occurred in lower quantities. Volatiles were not affected during 5 days of storage.
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Acknowledgements
The authors are indebted to Mr. Fabio Rossi, chef of “Vite” Restaurant at San Patrignano Community (Coriano di Rimini, Italy) for the preparation of SV samples. The authors gratefully acknowledged Marlene Shiva Vezzaro for performing part of the experiments and Dr. Chiara Manzi from ASSIC, Associazione per la Sicurezza Nutrizionale in Cucina (Rome, Italy) for her assistance.
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Rinaldi, M., Dall’Asta, C., Meli, F. et al. Physicochemical and Microbiological Quality of Sous-Vide-Processed Carrots and Brussels Sprouts. Food Bioprocess Technol 6, 3076–3087 (2013). https://doi.org/10.1007/s11947-012-0973-8
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DOI: https://doi.org/10.1007/s11947-012-0973-8