Preparation method of dialdehyde bacterial cellulose
A technology of bacterial cellulose and Acetobacter xylinum is applied in the field of oxidative modification of bacterial cellulose, which can solve the problems of inapplicability to small-diameter blood vessels, compliance mismatch, intimal hyperplasia, etc., and achieve high wet film porosity and shape. good controllability and biocompatibility
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example 1
[0022] Example 1: Rinse the bacterial cellulose gel in running water to remove the residual medium containing Acetobacter xylinum; then put the bacterial cellulose gel into 0.1% sodium hydroxide solution, heat to 80°C, every two hours Change the sodium hydroxide solution once, boil for 3 times, then rinse with running water, and then rinse with distilled water until the pH is 7. Then add the bacterial cellulose gel into the sodium periodate solution with a concentration of 0.1 mol / L, react at 37°C for 3 hours, then wash with 0.1 mol / L ethylene glycol solution, and then wash with double distilled water until the starch The color of potassium iodide test paper is not blue. The content of aldehyde groups was determined to account for 9.80% of the total.
example 2
[0023] Example 2: Rinse the bacterial cellulose gel in running water to remove the residual medium containing Acetobacter xylinum; then put the bacterial cellulose into 0.1% sodium hydroxide solution, heat to 80°C, and change it every two hours Sodium hydroxide solution, boiled 3 times, rinsed with running water, and rinsed with distilled water until the pH was 7. Then add the bacterial cellulose gel to the sodium periodate solution with a concentration of 0.1 mol / L, react at 37°C for 6 hours, then wash with 0.1 mol / L ethylene glycol solution, and then wash with double distilled water until the starch The color of potassium iodide test paper is not blue. The content of aldehyde groups was determined to account for 11.02% of the total.
example 3
[0024] Example 3: Rinse the bacterial cellulose gel in running water to remove the residual medium containing Acetobacter xylinum; then put the bacterial cellulose into 0.1% sodium hydroxide solution, heat to 80°C, and change it every two hours Sodium hydroxide solution, boiled 3 times, rinsed with running water, and rinsed with distilled water until the pH was 7. Then add bacterial cellulose gel into sodium periodate solution with a concentration of 0.1 mol / L, react at 37°C for 9 hours, then wash with 0.1 mol / L ethylene glycol solution, and then wash with double distilled water until the starch The color of potassium iodide test paper is not blue. The content of aldehyde groups was determined to account for 22.27% of the total.
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