Efficacy of UV radiation as an alternative technology to inactivate microorganisms in grape juices and wines.
Efficacy of UV radiation as an alternative technology to inactivate microorganisms in grape juices and wines.
Nov 10, 2011 6
(InfoWine) - Since sulphur dioxide (SO2) is associated with health risks, the wine industry endeavours to reduce SO2 levels in wines with new innovative techniques. The aim of this study was, therefore, to investigate the efficacy of ultraviolet radiation (UV)-C (254 nm) as an alternative technology to inactivate microorganisms in grape juices and wines.
A pilot-scale UV-C technology (SurePure, South Africa) consisting of an UV-C germicidal lamp (100 W output; 30 W UV-C output) was used to apply UV-C dosages ranging from 0 to 3672 J l−1, at a constant flow rate of 4000 l h−1 (Re > 7500). Yeasts, lactic and acetic acid bacteria were singly and co-inoculated into 20 l batches of Chenin blanc juice, Shiraz juice, Chardonnay wine and Pinotage wine, respectively.
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