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Ô­ÎÄÈçÏ£º 100 mg of HA were dissolved in 20 ml of double distilled water, then PAHy (64 mg) was added to this solution. The reaction mixture was maintained in a thermostatic bath at 37 C and the pH was adjusted to
4.75 by adding HCl 0.1 N solution.
    Then activating agent EDC was added to the mixture.
    After EDC addition, gelation occurred in few sec. The obtained gels were stirred at 37 C for 4 h and during this time the value of pH wascontinuously controlled and maintained at 4.75 by using HCl 0.1 N solution. After 4 h, each gel was purified by several washes with double distilled water, centrifuging, from time to time, at 12000 rpm at 4 C for 15 min, then recovered after lyophilization.

[ Last edited by cyh2010 on 2009-4-30 at 08:32 ]
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