beta-Maltose → alpha-Maltotriose

Participants

Reaction Steps

D-Glucose (10 mg), D-maltose (10 mg) maltotriose (25 mg), D-glucosamine (10 mg) or N-acetyl-D-mannosamine (10 mg) were reacted with O-(3-thiolpropyl)hydroxylamine (6 mg) in 1 ml D2O adjusted to pH 5.5 with 30% solution of NaOD at 37° C. for 15 hours. Progress of reaction was monitored by 1H NMR. Maltotriose-SH (30 mg) was separated from linker by passing through BioBel P-2 column in 0.05 M pyridine acetate buffer as above and freeze-dried. Next 30 mg of maltotriose-SH was reacted with bromoacetamido-derivatized BSA (15 mg), prepared as above to form maltotriose-BSA conjugate by thioether linkages. Reaction was done in buffer A, pH 7.4, 3 hours and solution was purified on Sephadex G-100 column as above. Extent of conjugation was evaluated by MALDI-TOF. Molecular mass of bromoacetamido-BSA was 73545 Da, while maltotriose-BSA conjugate was 81673 Da, indicated incorporation of 16 maltotriose molecules per BSA.

Provenance & Evidence