A preparation method and product of a medical catheter with ultrasonic imaging capability based on hydrophobically modified porous starch
A porous starch and ultrasonic imaging technology, applied in catheters and other directions, can solve problems such as difficult to achieve precise positioning, difficult to degrade catheters, and pollute the environment, and achieve the effects of low toxicity, low price, and easy degradation
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Embodiment 1
[0026] 1, figure 1 For the preparation scheme diagram of composite modified porous starch, the specific steps are as follows:
[0027] (1) Weigh a certain amount of common cornstarch and disperse it in CH with a pH of 4.8 3 COONa-CH 3 In COOH buffer solution, make 22% (mass fraction) starch emulsion, add a certain amount of compound enzyme (mixing glucoamylase and α-amylase at a mass ratio of 4:1) and enzymolyze it at 40°C. After the reaction is completed, Add 0.1 mol / L NaOH solution to react for about 15 minutes to inactivate the enzyme, wash with deionized water and ethanol three times respectively, and dry in a blast drying oven at 50°C for 48 hours to obtain porous starch;
[0028] (2) Weigh a certain amount of porous starch obtained in (1), disperse it in deionized water, and make a starch emulsion of 25% (mass fraction), place it in an oil bath at 40°C, stir constantly, and adjust the starch emulsion pH within the range of 8.0 to 8.5, add quantitative octenyl succinic...
Embodiment 2
[0035] 1, figure 1 For the preparation scheme diagram of composite modified porous starch, the specific steps are as follows:
[0036] (5) Weigh a certain amount of common cornstarch and disperse it in CH with a pH of 4.7. 3 COONa-CH 3 In COOH buffer solution, make 20% (mass fraction) starch emulsion, add a certain amount of compound enzyme (mixture of glucoamylase and α-amylase at a mass ratio of 4:1) and enzymolyze it at 40°C. After the reaction is completed, Add 0.1 mol / L NaOH solution to react for about 15 minutes to inactivate the enzyme, wash with deionized water and ethanol three times respectively, and dry in a blast drying oven at 55°C for 48 hours to obtain porous starch;
[0037] (6) Weigh a certain amount of porous starch obtained in (1), disperse it in deionized water, and make it into a starch emulsion of 28% (mass fraction), place it in an oil bath at 40°C, and keep stirring to adjust the starch emulsion pH in the range of 8.0 to 8.5, add quantitative OSA dro...
Embodiment 3
[0044] 1, figure 1 For the preparation scheme diagram of composite modified porous starch, the specific steps are as follows:
[0045] (1) Weigh a certain amount of common cornstarch and disperse it in CH with a pH of 4.9 3 COONa-CH 3 In COOH buffer solution, make 25% (mass fraction) starch emulsion, add a certain amount of compound enzyme (mixing glucoamylase and α-amylase at a mass ratio of 4:1) and enzymolyze it at 40°C. After the reaction is completed, Add 0.1 mol / L NaOH solution to react for about 15 minutes to inactivate the enzyme, wash with deionized water and ethanol three times respectively, and dry in a blast drying oven at 60°C for 48 hours to obtain porous starch;
[0046] (2) Weigh a certain amount of porous starch obtained in (1), disperse it in deionized water, and make it into a starch emulsion of 30% (mass fraction), place it in an oil bath at 40°C, stir constantly, and adjust the starch emulsion pH in the range of 8.0 to 8.5, add quantitative OSA dropwise...
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