Table 1.

CIELAB parameters of frozen and dried A. altissima leaves.

Sample	Material Processing	L*	a*	b*	ΔE	Whiteness Index	Yellowness Index
A. altissima leaf acetone extract	2° field of view
	Freezing	27.68 ± 0.82	−43.90 ± 0.05	44.01 ± 0.07	-	−14.81	96.01
	Drying (r.t.)	0.65 ± 0.11	0.46 ± 0.04	0.83 ± 0.16	67.54	−0.14	74.19
	Drying (30 °C)	1.26 ± 0.05	−0.58 ± 0.07	1.80 ± 0.04	66.00	−0.32	83.86
	Drying (50 °C)	0.38 ± 0.05	0.09 ± 0.04	0.41 ± 0.05	67.68	−0.06	63.04
	10° field of view
	Freezing	26.63 ± 2.66	−35.05 ± 1.46	43.32 ± 2.83	-	−14.81	96.01
	Drying (r.t.)	0.60 ± 0.10	0.42 ± 0.06	0.73 ± 0.13	61.23	−0.14	74.19
	Drying (30 °C)	1.16 ± 0.28	−0.40 ± 0.05	1.63 ± 0.42	59.90	−0.32	83.86
	Drying (50 °C)	0.36 ± 0.17	0.15 ± 0.06	0.36 ± 0.07	61.44	−0.06	63.04