and nyaluronan (Croma Pharma, Leobendorf, Austria) were used as standards. Unsaturated disaccharide preparations of 2-acetamido-2-deoxy-3-O-(2-O-sulfo-4-deoxy-แอลฟ่า-L-threo-hex-4-enopyranosyluronic acid)-6-O-sulfo-D-galactose (เดลต้า), All other chemicals used were of analytical reagent grade.
A total of 11 different CS formulations (tablets, hard capsules, and liquid formulations) wereused for quality control. The products were randomly gathered from the European marketplace.