Bulk and Surface Chemical Composition of Wheat Flour Particles of Different Sizes

Table 5

The corresponding relationship between XPS decomposition peaks and the amino acids with side-chains containing corresponding functional groups.

XPS decomposition peaks	Corresponding functional groups	Corresponding amino acid
C1s Peak 2	C- O, C-N, O-C-O, O=C-O, O=C-N	Tyr, Try, Ser, Thr
C1s Peak 3+O1s Peak 1+O1s Peak 3	O=C-OH, O=C-OR, O=C-OH,O=C-N,O=C-O, O=C-OH	Asp, Glu
C1s Peak 2+O1s Peak 1+N1s peak 1	C- O, C-N, O-C-O, O=C-O, O=C-N, O=C-OH,O=C-N,O=C-O, O=C-NH, O=C-NH2	Asn, Gln
N1s peak 1	O=C-NH, O=C-NH2	His, Arg
N1s peak 2	C-NH3^+	Lys
S2p	-SH, -S-	Met, Cys
C1s Peak 2+C1s Peak 3+O1s Peak 1+O1s Peak 3+N1s peak 1	C- O, C-N, O-C-O, O=C-O, O=C-N, O=C-OH, O=C-OR, O=C-OH,O=C-N,O=C-O, O=C-OH, O=C-NH, O=C-NH2	Tyr, Try, Ser, Thr, Asp, GluAsn, Gln, His, Arg