. 2021 Jan 1;7(1):e05882. doi: 10.1016/j.heliyon.2020.e05882

Table 4.

Color Parameters and White Index (WI), Browning Index Differences (ΔBI) and Total Color Differences (ΔE) of fresh, untreated and pre-treated dried pineapple slices.

Sample Condition		L∗	a∗	b∗	Chroma	Hue Angle	WI	BI	ΔBI	ΔE
Fresh		75.39 $\pm$ 1.35^a	2.03 $\pm$ 0.46^b	26.81 $\pm$ 3.96^bc	26.89 $\pm$ 3.98^c	85.72 $\pm$ 0.36^a	63.42 $\pm$ 2.05^a	44.89 $\pm$ 7.33^c	-	-
Drying at 50 °C	UTR	63.63 $\pm$ 3.33^bc	12.76 $\pm$ 0.51^a	38.68 $\pm$ 4.26^a	38.41 $\pm$ 6.04^ab	72.61 $\pm$ 1.95^b	45.23 $\pm$ 1.41^b	103.36 $\pm$ 8.05^ab	58.46 $\pm$ 14.74^ab	79.18 $\pm$ 3.58^a
	1TR	55.86 $\pm$ 6.27^bcd	10.60 $\pm$ 1.85^a	28.13 $\pm$ 0.62^bc	30.10 $\pm$ 1.18^bc	69.48 $\pm$ 2.97^b	46.47 $\pm$ 4.72^b	82.75 $\pm$ 9.12^b	37.85 $\pm$ 6.17^b	77.84 $\pm$ 5.52^a
	2TR	64.42 $\pm$ 1.19^b	11.19 $\pm$ 1.64^a	39.19 $\pm$ 7.69^a	40.77 $\pm$ 7.83^a	73.91 $\pm$ 1.10^b	45.68 $\pm$ 5.22^b	102.54 $\pm$ 25.09^ab	57.64 $\pm$ 17.79^ab	80.99 $\pm$ 3.17^a
	3TR	55.44 $\pm$ 4.06^bcd	11.76 $\pm$ 0.40^a	33.07 $\pm$ 3.36^abc	35.12 $\pm$ 3.18^abc	70.25 $\pm$ 1.93^b	43.13 $\pm$ 1.59^bc	101.84 $\pm$ 4.37^a	56.95 $\pm$ 10.88^ab	75.92 $\pm$ 3.24^a
	4TR	58.10 $\pm$ 3.01^bcd	10.79 $\pm$ 0.55^a	32.59 $\pm$ 2.48^abc	34.34 $\pm$ 2.46^abc	71.64 $\pm$ 1.07^b	45.75 $\pm$ 1.54^b	92.68 $\pm$ 6.35^ab	47.78 $\pm$ 8.88^ab	79.73 $\pm$ 2.31^a
Drying at 55 °C	UTR	57.53 $\pm$ 0.46^bcd	11.12 $\pm$ 0.73^a	35.39 $\pm$ 1.65^ab	37.12 $\pm$ 1.37^ab	72.50 $\pm$ 1.82^b	43.59 $\pm$ 0.82^bc	104.56 $\pm$ 4.91^ab	59.66 $\pm$ 12.01^ab	77.69 $\pm$ 0.64^a
	1TR	49.48 $\pm$ 1.99^de	12.16 $\pm$ 0.28^a	28.82 $\pm$ 1.23^bc	30.88 $\pm$ 1.21^bc	68.92 $\pm$ 0.71^bc	40.56 $\pm$ 2.05^bc	101.78 $\pm$ 9.39^ab	56.88 $\pm$ 4.47^ab	71.87 $\pm$ 3.09^ab
	2TR	41.91 $\pm$ 5.04^e	12.12 $\pm$ 0.09^a	23.99 $\pm$ 2.09^c	26.72 $\pm$ 1.84^c	63.79 $\pm$ 2.21^c	35.92 $\pm$ 3.87^c	103.15 $\pm$ 7.08^ab	58.25 $\pm$ 14.16^ab	64.85 $\pm$ 3.68^b
	3TR	51.55 $\pm$ 0.71^d	12.34 $\pm$ 1.81^a	33.63 $\pm$ 3.82^ab	34.96 $\pm$ 1.91^abc	68.54 $\pm$ 0.76^bc	39.66 $\pm$ 1.95^bc	116.56 $\pm$ 17.28^ab	71.66 $\pm$ 10.42^aab	73.13 $\pm$ 1.147^ab
	4TR	51.11 $\pm$ 0.39^de	10.38 $\pm$ 0.40^a	27.01 $\pm$ 1.97^bc	28.94 $\pm$ 1.78^bc	68.88 $\pm$ 1.86^bc	43.18 $\pm$ 1.00^bc	87.68 $\pm$ 7.23^ab	42.78 $\pm$ 14.45^ab	73.89 $\pm$ 1.24^ab
Drying at 60 °C	UTR	58.47 $\pm$ 1.87^bcd	9.70 $\pm$ 0.58^a	32.52 $\pm$ 0.89^abc	33.95 $\pm$ 0.78^abc	73.33 $\pm$ 1.27^b	46.35 $\pm$ 1.26^b	90.21 $\pm$ 3.53^ab	45.31 $\pm$ 4.09^ab	80.22 $\pm$ 1.34^a
	1TR	54.41 $\pm$ 2.46^cd	11.07 $\pm$ 0.75^a	29.89 $\pm$ 3.48^abc	31.93 $\pm$ 3.01^abc	69.39 $\pm$ 3.45^b	44.26 $\pm$ 0.67^b	91.65 $\pm$ 6.77^ab	46.75 $\pm$ 4.68^ab	76.93 $\pm$ 1.58^a
	2TR	53.66 $\pm$ 1.11^d	11.59 $\pm$ 0.29^a	31.80 $\pm$ 0.39^abc	33.85 $\pm$ 0.28^abc	69.95 $\pm$ 0.68^b	42.61 $\pm$ 0.85^bc	101.43 $\pm$ 2.69^ab	56.53 $\pm$ 9.99^ab	75.52 $\pm$ 0.79^a
	3TR	55.29 $\pm$ 2.70^bcd	10.41 $\pm$ 1.04^a	30.81 $\pm$ 1.31^abc	32.52 $\pm$ 1.58^abc	71.37 $\pm$ 1.01^b	44.71 $\pm$ 3.11^b	92.71 $\pm$ 12.24^ab	47.81 $\pm$ 4.99^ab	77.68 $\pm$ 3.40^a
	4TR	54.74 $\pm$ 5.69^cd	11.16 $\pm$ 1.41^a	30.85 $\pm$ 0.38^abc	32.84 $\pm$ 0.37^abc	70.13 $\pm$ 2.47^b	44.03 $\pm$ 4.80^bc	95.85 $\pm$ 15.09^ab	50.95 $\pm$ 7.77^ab	76.60 $\pm$ 5.96^a

-All the values in the table are mean $\pm$ SD of three independent determinations. Samples in the same column with different superscript letters differ significantly p < 0.05.