NEBI is the browning of juice due to Maillard reactions, subsequently causing colour changes and loss of nutrients (Caminiti et al., 2011). There was a significant increase in NEBI of juice (Table 4) processed by UV-C and thermal, except U15. However, UV-C treated samples, U30 (0.09) and U60 (0.10) showed minimum increase from the control (0.06), when com- pared to thermal pasteurized samples (0.13). Correspondingly, Caminiti et al. (2011) observed non-significant increase of NEBI on UV-C treated apple and cranberry juice blend. There is an increasing trend in browning degree corresponding to UV-C exposure time, as previously reported by Zhang et al. (2011). This could be due to photodegradation reactions that pro- mote Maillard reaction between amino acids and reducing sugars causing enhancement of browning degree (Ibarz et al., 2005). For thermal pasteurized samples, there is enhanced formation of browning compounds, subsequently darkening the juice and reaching the highest NEBI value. Similarly, sig- nificant browning was observed in heat treated Valencia and Navel orange juice (Bull et al., 2004). The results of NEBI agrees with colour analysis, whereby the shift of colour from yellow towards light brown can be attributed to the decrease in (+b*) and increase in L* values.