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The aim of the present study was to investigate the effectiveness of UV-C treatment using a modified UVC reactor based on Dean vortex flow. Parameters taken into account were total aerobic bacteria count and yeast and mould counts, antioxidant capacity, total phenolic content, 5-HMF content, furan formation and sensory attributes. A UV-C treatment with 68.75 mJ/cm2 led to 2.21-log CFU/ml and 1.13-log CFU/ml reduction of TMAB and YM count, respectively. DPPH radical scavenging activity and total phenolic content of UV-C treated orange juice significantly decreased. However, UV-C induced reduction of HMF was observed. UV-C treatment would be a beneficial method to eliminate or decrease the HMF content if HMF were present in the juice as a consequences of obtained results. pH and °Brix remained constant after UV-C treatment. No furan formation was detected and no significant change observed in the quality attributes in regards to appearance and colour.

EFFECT OF UV-C TREATMENT ON MICROBIAL POPULATION AND BIOACTIVE COMPOUNDS OF ORANGE JUICE USING MODIFIED REACTOR BASED ON DEAN VORTEX FLOW