原文
2.2.1. Synthesis of thiol functionalized HA (HA-SH)
" class="Red_ext">Five grams of HA (MW 132K, 12.5 mmol) was dissolved in 250 ml of PBS solution (pH 7.0) and mixed well until no aggregation was observed. Three molar excess amounts of EDC (37.5 mmol) and HOBt (37.5 mmol) were added and stirred for 2 h, and then cystamine dihydrochloride (37.5 mmol) was added dropwise and mixed overnight. The reaction mixture was
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