Carboxybutyryl chitosan sulfuric ester and preparation method and use thereof
A technology of carboxybutyryl chitosan sulfate and chitosan sulfate, applied in the field of carboxybutyryl chitosan sulfate, can solve the problems of difficult sulfonation reaction, dissociation of carboxyl groups, etc. Control, less side reactions, mild reaction conditions
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Embodiment 1
[0023] 4.20g sulfur content is that the chitosan sulfate ester of 16.87% (weight ratio) is dissolved in the NaOH / glycine buffer solution (I=1mol / L) of 9.0 in 20ml pH, stirs at room temperature, divides and adds 0.6g butanediol in two times Acid anhydride (molar ratio of chitosan sulfate sugar unit to succinic anhydride 0.6) was stirred for 24 hours, and the pH was adjusted to 9.0-10.0; the reaction solution was put into a dialysis bag and dialyzed for 3 days, and concentrated to obtain 0.5 g of brown powder, which was N- Carboxybutyryl chitosan sulfate. The substitution degree of elemental analysis is 0.77mol / unit, gel chromatography proves that the difference between molecular weight and chitosan sulfate is very small, there is no degradation phenomenon in the reaction process, and the corresponding group characteristic absorption appears in infrared analysis, carboxyl (1560cm -1 and 1414cm -1 ) and amidocarbonyl (1640cm -1 ) without ester carbonyl absorption (1720cm -1 ),...
Embodiment 2
[0025] As in Example 1, the amount of succinic anhydride is 0.2g (the molar ratio of chitosan sulfate ester sugar unit to succinic anhydride is 0.2), and the elemental analysis degree of substitution is 0.18mol / unit. The activated partial thromboplastin time and thrombin time reached 1.1 times and 2 times of the corresponding chitosan sulfate respectively.
Embodiment 3
[0027] As in Example 1, the amount of succinic anhydride is 0.8g (the molar ratio of chitosan sulfate sugar unit to succinic anhydride is 0.8), and the elemental analysis degree of substitution is 0.77mol / unit. The activated partial thromboplastin time and thrombin time reached 0.5 times and 0.9 times of the corresponding chitosan sulfate respectively.
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