Table 2. Protein contents and yield of oat proteins under the alkaline extraction and acid precipitation pH conditions

Alkaline extraction pH	Isoelectric precipitation pH	Extracted protein contents (mg/mL)	Precipitation protein contents (mg/mL)	Crude protein contents (%)	Extraction yield of protein (%)
11	3.0	12.77±0.03^1)a2)	1.55±0.08^e	5.45±0.31^e	33.09±3.36^b
	4.0	12.77±0.03^a	2.23±0.04^d	8.33±0.27^d	29.38±0.67^b
	5.0	12.77±0.03^a	2.76±0.01^c	16.99±0.33^c	54.12±4.25^a
	6.0	12.77±0.03^a	5.90±0.05^b	17.72±0.24^b	54.36±0.39^a
	7.0	12.77±0.03^a	7.55±0.05^a	22.02±0.26^a	10.03±1.20^c
12	3.0	11.76±0.05^b	1.59±0.04^e	5.17±0.09^e	42.16±7.66^b
	4.0	11.76±0.05^b	3.27±0.02^d	11.11±0.27^d	55.34±7.80^a
	5.0	11.76±0.05^b	5.22±0.05^c	17.35±0.15^c	54.90±3.89^a
	6.0	11.76±0.05^b	7.11±0.05^b	19.28±0.25^b	42.16±0.88^b
	7.0	11.76±0.05^b	9.09±0.04^a	21.06±0.38^a	13.42±0.89^c
13	3.0	11.12±0.05^c	1.63±0.08^e	2.69±0.28^e	23.55±3.99^c
	4.0	11.12±0.05^c	4.45±0.10^d	11.91±0.25^d	37.92±1.37^a
	5.0	11.12±0.05^c	5.35±0.03^c	17.36±0.27^c	33.69±2.46^ab
	6.0	11.12±0.05^c	8.27±0.04^b	28.76±0.30^b	35.56±1.26^ab
	7.0	11.12±0.05^c	9.62±0.05^a	45.38±0.18^a	31.17±3.80^b

All values are mean±SD (n=3).
Different superscript letters (^a-e) in the same column indicate significant differences (p<0.05) by Duncan’s multiple range test.