The UV-C lamp has a peak emission at 254 nm. The distance between the juice surface and the UV-C lamp was 35 cm. The UV-C lamp was allowed to stabilize for 30 min prior to use. The duration of exposure was 15, 30, and 60 min, at 25 ± 1 ◦ C. The mean of UV radiation dose received by each juice sample is 3.525 J/m2 (digital radiometer) (Keyser et al., 2008). Juice samples not exposed to UV-C were treated as control.