Supercritical carbon dioxide-treated blood orange juice as a new product in the fresh fruit juice market |
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| Authors: | Simona Fabroni Margherita Amenta Nicolina Timpanaro Paolo Rapisarda |
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| Affiliation: | 1. Department of Food Technology, Universitat Politècnica de València, Camí de Vera s/n, E46022 Valencia, Spain;2. Department of Chemical and Materials Engineering, University of Auckland, Auckland 1142, New Zealand;1. Universidade Federal do Ceará, Departamento de Tecnologia de Alimentos, Campus do Pici, Bloco 858, 60440-900 Fortaleza, CE, Brazil;2. Teagasc Food Research Centre, Ashtown, Dublin 15, Ireland;3. Embrapa Agroindústria Tropical, 60511-110 Fortaleza, CE, Brazil;4. Universidade Federal do Ceará, Departamento de Engenharia Química, Campus do Pici, Bloco 709, 60440-900 Fortaleza, CE, Brazil;1. Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie (L3BS), Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, 06000 Bejaia, Algeria;2. CIRAD, UMR95 QualiSud, 73 av. J.F. Breton, TA B-95/16, F-34398 Montpellier Cedex 5, France;3. Montpellier SupAgro, UMR95 QualiSud, 1101 av. Agropolis, B.P. 5098, F-34093 Montpellier Cedex 5, France;1. CNRS, Chimie et Biologie des Membranes et des Nano-objets (UMR 5248 CBMN), Allée Geoffroy Saint Hilaire, 33600 Pessac, France;2. Université de Bordeaux, Chimie et Biologie des Membranes et des Nano-objets (UMR 5248 CBMN), Allée Geoffroy Saint Hilaire, 33600 Pessac, France;3. Bordeaux INP, Chimie et Biologie des Membranes et des Nano-objets (UMR 5248 CBMN), Allée Geoffroy Saint Hilaire, 33600 Pessac, France |
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| Abstract: | The work described here deals with the effectiveness of using high-pressure carbon dioxide treatment (HPCD) to stabilise freshly squeezed blood orange juice. Technical planning of a continuous high-pressure supercritical carbon dioxide pilot system, suitable for development on an industrial scale, was carried out in our lab. To determine the optimal operating conditions (temperature, pressure, and CO2/juice ratio), three different experimental trials were carried out. The first trial was conducted at 230 bar, 36 ± 1 °C, 5.08 L/h juice flow rate, and 3.91 L/h CO2 flow rate, corresponding to a gCO2/gjuice ratio of 0.770. The second trial utilised the same conditions except that the operative pressure was reduced (130 bar). The third trial was carried out at 130 bar, 36 ± 1 °C, 5.08 L/h juice flow rate, 1.96 L/h CO2 flow rate, corresponding to a 0.385 gCO2/gjuice ratio. The effects of processing were evaluated by determining physicochemical, antioxidant, and microbiological parameters of the treated juices. In addition, once the best operative parameters had been determined, physicochemical, antioxidant, microbiological and sensory evaluation of fresh blood orange juice stabilised by HPCD treatment was carried out during refrigerated storage of juices at 4 ± 1 °C for thirty days. The results showed that HPCD treatment cannot be considered as an alternative to traditional thermal methods but as a new mild technology for producing a stabilised blood orange juice with a shelf-life of 20 days.Industrial relevanceBlood oranges are the main cultivated varieties of Citrus sinensis (L.) Osbeck in Italy. Freshly squeezed blood orange juice exert a high antiradical and antioxidant activity, due to its rich phenolic profile, but its preservation is usually assured by thermal treatment which affects its nutritional and sensory value. In this study we proposed a “milder” continuous HPCD process suitable for implementation on an industrial scale. The HPCD stabilised juice retains its physicochemical, antioxidant, and sensory properties and could be placed within a new retail framework, namely, that of fresh juices with a shelf-life of 20 days. |
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