Table 4.

Effects of protein concentration and phenolic removal on α-glucosidase and DPPH radical scavenging activities

F. deltoidea samples	Total phenolic content (mg gallic acid equivalent/g sample)	Protein (μg protein/mg sample)	IC50, (μg/ml)
			Crude α-glucosidase inhibitory activity	DPPH radical scavenging activity
SF (var. angustifolia)
SFC	5.89 ± 0.12a,***	49.53 ± 3.06e	348.38 ± 20.06**	547.83 ± 18.11***
SFW	3.98 ± 0.07b,***	59.53 ± 1.16e	396.99 ± 16.01*	975.20 ± 20.79***
BF (var. kunstleri)
BFC	8.29 ± 0.10c,***	70.87 ± 1.15f,*	350.72 ± 16.80**	449.64 ± 17.3**
BFW	6.56 ± 0.12d,***	86.86 ± 3.10g,**	199.64 ± 10.77***	531.17 ± 21.59***

Each value is expressed as a mean ± SD (n = 3). Values with different superscript letters between the same variety, within the same column are significantly different at p < 0.01. *p < 0.05, **p < 0.01 and ***p < 0.001 are significant differences from samples which were not treated with PVP, (NH₄)₂SO₄ and cold acetone. PVP: Polyvinylpyrrolidone; (NH₄)₂SO₄: ammonium sulphate. SFC and SFW indicate crude aqueous extract and water fraction of SF (var. angustifolia). BFC and BFW indicate crude aqueous extract and water fraction of BF (var. kuntsleri).