. 2019 Dec 16;57(3):1100–1109. doi: 10.1007/s13197-019-04145-2

Table 2.

Percentages of the different secondary structures of SK1 and SK2 based on Gaussian curve fitting

Structural properties	Present study^a		Gao et al. (2005)^a	Espinosa-Ramírez et al. (2017)^a		Xiao et al. (2014)^b	Georget et al. (2012)^a
Structural properties	SK1	SK2	Gao et al. (2005)^a	I	II	Xiao et al. (2014)^b	Georget et al. (2012)^a
Intermolecular β-sheet (%)	23.92 ± 1.65	21.32 ± 1.81	–	36	42	24	40
α-helix (%)	22.10 ± 3.28	25.49 ± 2.93	–	–	–	–	–
Random coil (%)	17.25 ± 8.84	26.45 ± 4.67
Random coil and α-helix (%)	39.35 ± 5.55	51.94 ± 7.60	–	35	33	49	39
β-turns (%)	31.21 ± 1.66	22.26 ± 5.37	–	28	25	27	22
α-helix/intermolecular β-sheet ratio	1.00 ± 0.04	1.25 ± 0.23	0.96	0.96–1.07	0.87	–	–
amide I/amide II ratio	1.16 ± 0.08	1.21 ± 0.01	–	–	–	–	–

I: kafirin extract from decorticated sorghum flour (dry milling) and II: kafirin extract from decorticated sorghum gluten meal (wet milling)

^aEthanol extraction

^bUltrasound-assisted tert-butanol extraction