. 2018 Mar 1;51(4):e6069. doi: 10.1590/1414-431X20176069

Table 2. Quantification of total phenolic compounds, total flavonoids and tannins and antioxidant properties (total antioxidant capacity, TAC), reducing power, DPPH radical-scavenging effect and ORAC assay of melon peel and seed extracts.

Bioactive compounds and antioxidant activities	Melon peel extracts (dry extract)			Melon seed extracts (dry extract)
	Aqueous	Hydromethanolic (70:30 v/v)	Hydroethanolic (70:30 v/v)	Aqueous	Hydromethanolic (70:30 v/v)	Hydroethanolic (70:30 v/v)
Total phenols compounds (mg GAE/100 g)	110.7±15.03^c	703.1±12.65^a	203.1±7.17^b	75.2±7.39^b	111.7±12.36^a	69.77±12.78^b
Total flavonoids content (µg CE/100 g)	262±0.20^b	125±0.10^a	104±0.15^c	109±0.40^a	93±0.20^a	99±0.30^a
Tannins (µg CE/100 g)	nd	309±0.20^a	nd	nd	146±0.30^b	nd
TAC (mg AAE/g)	40.3±2.04^b	74.5±2.76^a	88.7±2.99^a	34.5±1.98^b	82.9±2.54^a	49.8±1.76^b
Reducing Power (%)	96.1±2.10^a	17.5±1.35^b	17.1±1.89^b	25.3±1.79^b	91.2±2.66^a	91.6±2.78^a
DPPH activity scavenging (%)	28.6±0.31^a	30.1±0.23^a	30.1±0.16^a	1.09±0.54^c	4.8±1.17^b	6.2±0.43^a
Total ORAC value (mmol TE/100 g)	12.2±0.67	17.4±1.02	19.49±0.97	2.75±0.18	20.2±0.66	21.9±1.87

Data are reported as means±SD with experiments performed in triplicate. GAE: gallic acid equivalent; CE: catechin equivalent; TE: trolox; nd: not determined. DPPH: 1,1-diphenyl-2-picrylhydrazyl assay for antiradical activity; ORAC: oxygen reactive antioxidant capacity. Antioxidant properties results were evaluated at 1.0 mg/mL concentration. TAC results are reported as ascorbic acid equivalent (AAE). Different letters indicate significant differences between different extracts of each residue at the same concentration (P<0.05, ANOVA).