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Pilot-scale production of cloudy juice from low-quality pear fruit under low-oxygen conditions
Domien De Paepe1, Katleen Coudijzer2, Bart Noten3
1Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Science Unit (T&V), Food Pilot, Brusselsesteenweg 370, 9090 Melle, Belgium; Flemish Institute for Technological Research (VITO), Business Unit for Separation and Conversion Technology (SCT), Boeretang 200, 2400 Mol, Belgium; Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Sciences Unit, Product Quality and Innovation Research Area, Burgemeester Van Gansberghelaan 115/1, 9820 Merelbeke, Belgium.
Abstract:
In this study, a process for the production of premium quality yellowish, cloudy pear juice from low-quality fruit under low-oxygen conditions was developed. The production process consisted of (1) shredding, (2) pressing with spiral-filter technology including a vacuumised extraction cell, (3) holding in an inert gas buffer tank, (4) pasteurisation, (5) and refrigerated storage. First, the system parameters of a spiral-filter press were optimised with the aim of producing a yellowish, cloudy pear juice with the highest possible juice yield. A maximum juice yield of 78% could be obtained. Enzymatic browning during juice extraction could be suppressed as a result of the fast processing and the low air (oxygen) levels in the extraction chamber of the spiral-filter press. Furthermore, we observed that instantaneous pasteurisation at 107 °C for 6s, subsequent aluminium laminate packaging and cold storage had only a minimum effect on the phenolic composition.
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