Table 1
Comparison of yield and total polyphenol and flavonoid contents of Oenothera biennis obtained by different extraction methods

samples¹⁾	Yield(%)	Polyphenol (mgGAE²⁾/g)	Flavonoid (mgRHE³⁾/g)
SE	40.23±0.25^b4)	422.32±9.79^a	65.17±2.89^a
USE	44.75±0.33^c	447.58±0.79^bc	68.98±1.83^ab
RE	46.33±0.57^d	463.05±1.94^d	71.71±0.71^b
AE	45.56±0.45^d	455.65±1.94^cd	65.52±3.75^a
LE	34.06±0.29^a	440.63±3.50^b	63.98±3.32^a

SE, stirrer extraction; USE, ultrasonification extraction; RE, reflex extraction; AE,autoclave extraction; LE, low temperature high pressure extraction.
GAE, Gallic acid equivalents.
RHE, Rutin hydrate equivalents.
a-dDifferent superscripts within each column indicate significant differences (p<0.05).