Table 2.

The proposed oligomer species for the MALDI ToF spectra peaks in Figure 2a–c and Figure 3a,b for the reaction at 120 °C for 1 h of sodium periodate with the soy protein isolate.

377 Da = [alanine]4-aspartic acid monoaldehyde without Na+ 409 Da (calc. 409 Da) = alanine pentamer monoaldehyde with Na+

But it could also be (but less likely) 409 Da = tyrosine-triptophane + Na+ (dimer) 455 Da (calc. 457 Da) = alanine hexamer monoaldehyde without Na+

OR455 Da (calc. 457 Da) = [alanine]2-[serine]3 monoaldehyde + Na+

659–660 Da = phenylalanine-triptophan-leucine-histidine + Na+ (tetramer) 659–660 Da = phenylalanine-triptophan-histidine-aspartic acid + Na+ (tetramer) 659–660 Da = serine-[alanine]5-glutamic acid dialdehyde + Na+

959 Da = phenylalanine-triptophan-leucine-histidine-phenylalanine-arginine + Na+ (hexamer) 959 Da = phenylalanine-triptophan-histidine-aspartic acid-phenylalanine-arginine + Na+ (hexamer)