Table 1.

Hue angle values and change in the antioxidant capacity of fruit juices after the different treatments

Treatment conditions			Hue angle value			Variation of the AOC (%)
Temperature (°C)	Carvacrol (μl/L)	Time (min)	Pineapple juice	Orange juice	Watermelon juice	Pineapple juice	Orange juice	Watermelon juice
90	0	0a	97.33 ± 0.04	81.16 ± 0.02	38.15 ± 0.06	−13.95 ± 4.50	−7.11 ± 5.56	−31.04 ± 1.17
90	0	20	96.16 ± 0.03	81.30 ± 0.03	43.52 ± 0.14	−13.75 ± 3.03	−3.91 ± 3.66	−41.18 ± 7.26
90	30	20	95.65 ± 0.04	81.46 ± 0.03	43.73 ± 0.08	−13.75 ± 3.67	−10.01 ± 7.27	−34.86 ± 4.85
90	0	40	95.51 ± 0.06	80.50 ± 0.05	44.99 ± 0.01	−14.40 ± 3.10	−13.97 ± 7.03	−39.95 ± 6.17
90	60	40	95.54 ± 0.03	80.11 ± 0.03	46.45 ± 0.06	−12.22 ± 5.49	−7.16 ± 3.74	−30.03 ± 7.68
80	15	10	96.16 ± 0.04	81.86 ± 0.04	41.08 ± 0.02	−8.37 ± 3.05	−3.25 ± 5.46	−33.88 ± 7.97
80	45	10	96.20 ± 0.01	81.53 ± 0.04	40.99 ± 0.03	−12.75 ± 3.55	−2.59 ± 5.57	−30.58 ± 6.56
80	15	30	95.51 ± 0.03	82.11 ± 0.02	42.46 ± 0.06	−11.16 ± 3.10	−1.42 ± 7.87	−27.69 ± 10.32
80	45	30	95.80 ± 0.03	81.66 ± 0.03	42.65 ± 0.03	−8.80 ± 3.85	−5.49 ± 1.90	−21.90 ± 7.54
70	0	0a	97.01 ± 0.04	82.10 ± 0.02	36.32 ± 0.10	−4.30 ± 4.35	−7.20 ± 4.98	+3.31 ± 11.59
70	30	0a	97.21 ± 0.01	82.11 ± 0.02	36.74 ± 0.09	−1.94 ± 3.70	+1.78 ± 7.12	+18.07 ± 9.23
70	0	20	96.43 ± 0.02	82.39 ± 0.02	38.59 ± 0.04	−7.50 ± 2.27	−3.64 ± 6.66	+14.25 ± 6.49
70	30	20	96.35 ± 0.03	82.18 ± 0.04	39.56 ± 0.13	−6.42 ± 3.03	+5.60 ± 5.79	+23.16 ± 15
70	30	20	96.12 ± 0.04	82.35 ± 0.04	38.62 ± 0.12	−11.28 ± 4.61	+4.98 ± 15.88	+21.37 ± 9.00
70	30	20	96.06 ± 0.02	82.11 ± 0.01	39.35 ± 0.03	−3.99 ± 2.73	−0.36 ± 6.16	+28.75 ± 8.44
70	60	20	96.55 ± 0.03	82.25 ± 0.01	40.05 ± 0.03	−7.39 ± 2.51	+9.87 ± 6.13	+30.53 ± 5.96
70	0	40	95.52 ± 0.01	82.51 ± 0.06	40.54 ± 0.06	−4.23 ± 3.64	0.00 ± 4.36	+26.72 ± 8.80
70	30	40	95.55 ± 0.01	82.12 ± 0.04	42.17 ± 0.04	−4.17 ± 3.85	+6.67 ± 5.47	+22.90 ± 7.00
60	15	10	96.57 ± 0.01	82.08 ± 0.04	37.13 ± 0.34	−5.66 ± 4.36	−9.60 ± 3.66	+25.21 ± 10.15
60	45	10	96.54 ± 0.03	81.85 ± 0.01	37.57 ± 0.23	−8.67 ± 4.98	−0.83 ± 3.76	+34.71 ± 9.39
60	15	30	96.50 ± 0.05	82.73 ± 0.03	38.62 ± 0.04	−6.50 ± 3.55	−4.58 ± 5.34	+29.75 ± 11.52
60	45	30	96.27 ± 0.03	82.14 ± 0.02	38.45 ± 0.19	−5.47 ± 3.21	−4.04 ± 4.28	+39.67 ± 12.04
50	0	0a	95.89 ± 0.02	81.87 ± 0.05	34.51 ± 0.22	−5.55 ± 4.54	−1.17 ± 4.18	+19.01 ± 10.59
50	0	20	96.88 ± 0.02	81.95 ± 0.03	36.47 ± 0.31	−4.68 ± 6.07	−4.29 ± 3.93	+49.17 ± 13.02
50	30	20	96.77 ± 0.01	81.92 ± 0.02	37.29 ± 0.21	−4.74 ± 6.34	+2.14 ± 7.76	+68.60 ± 8.68
50	0	40	96.71 ± 0.04	82.05 ± 0.01	36.18 ± 0.17	−2.92 ± 2.44	−0.49 ± 5.07	+66.94 ± 17.72
50	60	40	97.07 ± 0.02	81.99 ± 0.02	37.29 ± 0.29	+1.46 ± 0.82	+5.95 ± 7.56	+81.40 ± 7.05
Nontreated juice			Hue angle value			AOC (mmol/L TEAC)
			95.33 ± 0.02	81.97 ± 0.04	35.21 ± 0.12	4.38 ± 0.77	2.29 ± 0.68	0.42 ± 0.14

TEAC, Trolox Equivalent Antioxidant Capacity; AOC, antioxidant capacity.

^aSamples were removed from the water bath as soon as they reached the desired temperature.