added to dissolve the precipitate and the pH was adjusted to 5
with 1 M HCl. The solution was dialyzed for 3 days, changing water
twice per day, and lyophilized samples were analyzed.
2.2.4.2. CMTMC obtained with new carboxymethylation protocol –
CMTMC 2. An amount of 0.1 g of dried TMC was suspended in 10 mL
of NMP or isopropanol as solvent and left to stir overnight at 45 ◦C.
During 20 min, under continuous stirring, 0.5 mL of 50% NaOH was
slowly added to the reaction mixture that was stirred for another
45 min. Subsequently, 0.12 g of mono-chloroacetate (molar ratio
1:3 to TMC) was added during 25 min and reaction was leftfor 3 h at
60 ◦C under a nitrogen atmosphere in order to avoid TMC degradation.
Afterwards, pH was adjusted to neutral with 1 M HCl followed