Extraction of Phenolics and Flavonoids from Four Hosta Species Using Reflux and Ultrasound-Assisted Methods with Antioxidant and α-Glucosidase Inhibitory Activities

Table 2

Pearson correlation coefficients between different assays^a under influence of extraction conditions ()^b.

	RE extracts					UAE extracts
	TPC	TFC	DPPH	ABTS	α-Glu	TPC	TFC	DPPH	ABTS	α-Glu
Yield	-0.690	-0.890	0.795^ns	0.615	-0.133^ns	-0.632	-0.854	0.769^ns	0.617^ns	-0.069^ns
TPC		0.913^ns	-0.898	-0.828	-0.513^ns		0.907^ns	-0.795	-0.776	-0.570^ns
TFC			-0.876	-0.792^ns	-0.311^ns			-0.777	0.727	-0.362^ns
DPPH				0.909^ns	0.28^ns				0.895^ns	0.308
ABTS					0.561					0.605

^aTPC: total phenolic contents; TFC: total flavonoid contents; DPPH: DPPH free radical scavenging activity; ABTS: ABTS free radical scavenging activity; α-glu: α-glucosidase inhibitory activity; ^bRE extracts: reflux extracts; UAE extracts: ultrasound assisted extracts. ^nsNot significant, significant at , significant at .