In this study, advantages and disadvantages of the innovative, low-oxygen spiral-filter press system were studied in comparison with the belt press, commonly applied in small and medium size enterprises for the production of cloudy apple juice. On the basis of equivalent throughput, a higher juice yield could be achieved with spiral-filter press. Also a more turbid juice with a higher content of suspended solids could be produced. The avoidance of enzymatic browning during juice extraction led to an attractive yellowish juice with an elevated phenolic content. Moreover, it was found that juice produced with spiral-filter press demonstrates a higher retention of phenolic compounds during the downstream processing steps and storage. The results demonstrates the advantage of the use of a spiral-filter press in comparison with belt press in the production of a high quality cloudy apple juice rich in phenolic compounds, without the use of oxidation inhibiting additives.
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Non-enzymatic degradation of flavan-3-ols by ascorbic acid- and sugar-derived aldehydes during storage of apple juices and concentrates produced with the innovative spiral filter press.
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Department of Beverage Research, Chair Analysis and Technology of Plant-based Foods, Geisenheim University, Von-Lade-Strasse 1, 65366 Geisenheim, Germany. Electronic address:
Potentially health-promoting concentrations of flavan-3-ols were previously shown to be retained in apple juices produced with the emerging spiral filter press. Due to the novelty of this technology, the factors governing the stability of flavan-3-ol-rich apple juices have only scarcely been studied. Therefore, we produced flavan-3-ol-rich apple juices and concentrates (16, 40, 70 °Brix) supplemented with ascorbic acid (0.
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Department of Beverage Research, Chair Analysis and Technology of Plant-based Foods, Geisenheim University, Von-Lade-Strasse 1, 65366 Geisenheim, Germany.
The retention of flavan-3-ols and other phenolic compounds during apple juice production at pilot plant scale (200 kg, cv. Boskoop) was investigated. An oxygen-excluding spiral filter press and a conventional decanter were used with and without pectinase mash treatment.
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Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Sciences Unit (T&V), Product Quality and Innovation (PI), Burgemeester Van Gansberghelaan 115/1, 9820 Merelbeke, Belgium.
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