of deacetylation and 190 000–310 000 kg/mol molecular
weight) was obtained from Sigma-Aldrich. Also, METMS, METAC, ceric
ammonium nitrate (CAN), methanol, sodium hydroxide pellets, poly diallyldi
methylammonium, acetic acid (90 vol %), HCl (37%), sulfuric acid (98
wt %), and direct yellow 50 (Y50) dye were purchased from Sigma-Aldrich
company. Potassium polyvinyl sulfate (PVSK) (with molecular weight
of 200–300 kg/mol, 98.4% esterified) was provided by Wako Pure
Chemical Industries Ltd., Japan. Cellulose acetate dialysis membrane
(molecular weight cut-off of 1000 g/mol) was purchased from Wako Chemicals,
Japan. In this research work, no unexpected or unusually high safety
hazards were encountered.