Application of an Optimized HPLC Method for the Detection of Various Phenolic Compounds in Apples from Lithuanian Cultivars

Table 2

Precision of the HPLC method for the quantitative evaluation of phenolic compounds.

Compound	Relative standard deviation (%) for the peak area
	Intraday^a	Interday^b	Extraction after extraction
Procyanidin B1	1.32	2.39	3.77
(+)-Catechin	1.49	2.26	3.56
Chlorogenic acid	1.22	1.45	3.47
(−)-Epicatechin	1.52	2.35	3.92
Procyanidin B2	1.40	2.51	2.42
Hyperoside	1.38	2.61	2.77
Isoquercitrin	1.26	2.07	2.36
Rutin	1.37	2.44	2.71
Quercitrin	1.46	2.54	3.27
Avicularin	1.42	2.60	2.52
Phloridzin	1.48	2.76	3.61

aRepeatability.
bIntermediate precision.