Ultrasonic contrast agent and preparation method and application thereof
An ultrasonic contrast agent and stabilizer technology, applied in the field of ultrasonic contrast agent and its preparation, can solve the problems such as the inability to load active ingredients, the shell of the contrast agent is hard, and the contrast effect is not good, and achieves structural stability, improved mechanical index, and flexibility. Good results
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[0039] On the other hand, on the basis of the ultrasound contrast agent described above, the embodiment of the present invention also provides a preparation method of the ultrasound contrast agent. The preparation method of the ultrasound contrast agent is as follows figure 1 As shown, it includes the following steps:
[0040] S01: Dissolve the biodegradable polymer and lipid in an organic solvent to prepare an oil phase;
[0041] S02: Perform the first emulsification treatment on the oil-forming phase prepared in step S01 with water or an aqueous solution containing substances that are easily decomposed to generate gas to obtain a water-in-oil primary emulsion;
[0042] S03: Perform a second emulsification treatment on the primary emulsion and the water phase prepared in step S02 to obtain an oil-in-water-in-water double emulsion;
[0043] S04: Remove the organic solvent contained in the double emulsion prepared in step S03, collect the precipitate, and perform a freeze-drying treatm...
Example Embodiment
[0059] Example 1
[0060] The embodiment of the present invention provides a DPPC-PLA ultrasound contrast agent and a preparation method thereof. The DPPC-PLA ultrasound contrast agent is a hollow microbubble structure, wherein the shell of the hollow microbubble structure comprises a DPPC-PLA mixture, and the hollow cavity of the hollow microbubble structure is coated with ammonium bicarbonate.
[0061] The preparation method of the DPPC-PLA ultrasound contrast agent:
[0062] S11: Dissolve 0.1g PLA (with a number average molecular weight of 10,000) and 2.0mg DPPC in 1mL of dichloromethane to prepare the oil phase;
[0063] S12: Add 0.2ml of 6wt% ammonium bicarbonate aqueous solution to the oil phase, mix thoroughly, sonicate for 240 seconds at a power of 190W to prepare a water-in-oil primary emulsion;
[0064] S13: Drop the primary emulsion obtained above into a 4wt% polyvinyl alcohol (number average molecular weight of 30,000) aqueous solution at a stirring speed of 30,000 rpm, an...
Example Embodiment
[0066] Example 2
[0067] The embodiment of the present invention provides a DSPE-PLC ultrasound contrast agent and a preparation method thereof. The DSPE-PLC ultrasound contrast agent is a hollow microbubble structure, wherein the shell of the hollow microbubble structure includes a DSPE-PLC mixture, and the hollow cavity of the hollow microbubble structure is coated with ammonium bicarbonate.
[0068] The preparation method of the DSPE-PLC ultrasound contrast agent:
[0069] S21: Dissolve 0.15g PLC (with a number average molecular weight of 5,000) and 1.5mg DSPE in 2mL of dichloromethane to prepare an oil phase;
[0070] S22: Add 0.2ml of 6wt% ammonium bicarbonate aqueous solution to the oil phase, mix thoroughly, sonicate for 300 seconds at a power of 150W to prepare a water-in-oil primary emulsion;
[0071] S23: At a stirring speed of 40,000 rpm, drop the primary emulsion obtained above into a 5 wt% polyvinyl alcohol (number average molecular weight of 70,000) aqueous solution, an...
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