Table 4
Total polyphenol and flavonoid contents of acorn and acorn tea (mg/g)

Samples¹⁾	Polyphenol	Flavonoid
NA	34.59±0.28^b2)	1.38±0.08^d
OSAT	36.75±0.77^ab	2.26±0.19^b
TSAT	41.15±5.64^a	2.78±0.02^a
RAT	37.55±0.48^ab	1.64±0.03^c

NA, natural acron dried by room temperature; OSAT, acorn tea produced by one steaming (100℃, 15min) and drying; TSAT, acorn tea produced by three steaming (100℃, 15min) and drying; RAT, acorn tea produced by roasting (220℃, 10min).
All value are expressed as mean±SD of triplicate determinations. Different superscripts within the column are significantly different at p<0.05 by Duncan`s multiple range test.