Table 4.

Pearson’s correlation coefficients between in vitro biological activity methods and polyphenols content in caper flowers.

Accession	ABTS	FRAP	ORAC	AChE	BuChE	α-amylase	α-glucosidase
∑ Flavonols	0.666	0.598	0.805	0.393	0.547	0.497	0.357
∑ Quercetin derivatives	0.474	0.419	0.684	0.285	0.408	−0.301	−0.220
∑ Kaempferol derivatives	0.855	0.791	0.737	0.550	0.641	0.025	−0.438
∑ Isorhamnetin derivatives	0.556	0.466	0.786	0.226	0.423	−0.422	−0.181
∑ Myricetin derivatives	0.652	0.585	0.790	0.348	0.571	−0.217	−0.403
∑ Aglycone of flavonols	0.460	0.425	0.635	−0.170	0.278	−0.140	−0.257
∑ Mono-O-glycosides of flavonols	0.546	0.513	0.677	0.490	0.601	0.638	0.464
∑ Di-O-glycosides of flavonols	0.480	0.425	0.689	0.291	0.412	0.434	0.258
∑ Tri-O-glycosides of flavonols	0.546	0.468	0.806	0.183	0.379	0.224	0.105
∑ Tetra-O-glycosides of flavonols	0.479	0.420	0.784	0.027	0.251	0.092	−0.023
∑ Phenolic acid	0.571	0.582	0.287	0.866	0.765	0.925	0.871
∑ p-CA derivatives	0.737	0.730	0.694	0.605	0.732	0.085	−0.607
∑ CA derivatives	0.506	0.487	0.772	0.120	0.309	−0.458	−0.398
∑ p-QCA derivatives	0.747	0.699	0.906	0.102	0.445	−0.286	−0.371
∑ FQA derivatives	0.676	0.628	0.753	0.498	0.496	−0.268	−0.233
SA	0.496	0.460	0.428	0.204	0.434	0.270	−0.516
∑ flavan-3-ols	−0.239	−0.307	−0.009	−0.403	0.005	−0.268	0.153

pCA—derivatives of p-coumaric acids; CA—derivatives of caffeoylquinic acids; p-QCA—derivatives of p-coumaroylquinic acids; FQA—derivatives of feruloylquinic acids; SA—sinapic acid; correlation is significant at the 0.05 level.