Table 1.

Antioxidant activity as a measure of the bioactivity of the extracted leaf protein fractions.

Samples	ABTS Radical Scavenging Activity (mmol TE/g)	Metal-Ion Chelating Activity (mmol EE/g)	Hydroxyl Radical Scavenging Activity (mmol TE/g)	Protein Content (%)
Maceration	0.871 ± 0.058 ab	0.380 ± 0.022 c	1.380 ± 0.023 ac	52.07 ± 1.25 b
UAE-20%	0.893 ± 0.058 a	0.364 ± 0.026 c	1.540 ± 0.069 bc	54.52 ± 2.78 b
UAE-30%	0.794 ± 0.032 abc	0.545 ± 0.014 a	1.716 ± 0.025 b	62.47 ± 2.07 a
UAE-40%	0.657 ± 0.035 c	0.462 ± 0.014 b	2.126 ± 0.016 a	56.92 ± 0.34 b
UAE-50%	0.521 ± 0.032 d	0.248 ± 0.013 d	2.072 ± 0.032 a	63.95 ± 0.39 a
UAE-60%	0.443 ±0.029 e	0.229 ± 0.013 d	1.371 ± 0.015 c	63.06 ± 0.05 a
UAE-70%	0.436 ±0.025 e	0.225 ± 0.013 d	1.334 ± 0.015 a	62.51 ± 2.83 a

The data are presented as the mean ± SD (n = 3). Means with different letters for the same antioxidant activities of leaf protein (columns) are significantly different (p < 0.05). Legend: UAE-20%, UAE-30%, UAE-40%, UAE-50%, UAE-60%, and UAE-70% mean ultrasound-assisted extraction process at 20, 30, 40, 50, 60, and 70% amplitudes, respectively.