was purchased from Acros Organics. Primary Secondary Amine sorbent (PSA) was purchased from Agilent Technologies (CA, USA). Acrylamide (98%) was purchased from
Fluka. [2,3,3-d 3 ]-acrylamide (98%) was purchased from Sigma Aldrich (UK). D-fructose, Dglucose, sucrose (Total Glucose) and L-asparagine/L-aspartic acid (system reagents) were purchased from Thermo-Scientific.