Ultrasonic coupling agent for medical ultrasonic diagnosis and therapy and preparation method thereof
An ultrasonic coupling agent and ultrasonic technology, applied in the direction of echo/ultrasonic imaging agent, local antibacterial agent, etc., can solve the problems of large sound attenuation coefficient and low sound attenuation coefficient, and achieve small attenuation coefficient, easy cleaning and wide application range Effect
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preparation example 1
[0019] The preparation method of the chitin morpholine quaternary ammonium salt is as follows: under nitrogen protection, 100g chitin, 135.6g methylglycidyl morpholine quaternary ammonium salt, and 51.4g sodium hydroxide are added to DMSO at 35°C for reaction After 12 hours, cool to room temperature, adjust the pH to 6-7 with hydrochloric acid, concentrate the reaction solution, and recrystallize from methanol to obtain chitin morpholine quaternary ammonium salt. 1 HNMR (DMSO, d6) 1.95(s, 3H), 3.18(s, 3H), 3.31(s, 3H), 3.45(m, 4H), 3.51~3.60(m, 11H), 4.37~4.53(m, 5H) ), 4.75 (s, br, 1H), 5.22 (s, br, 1H), 7.92 (s, 1H).
preparation example 2
[0021] The preparation method of the chitin morpholine quaternary ammonium salt is as follows: under the protection of nitrogen, 100g chitin, 101.7g methylglycidyl morpholine quaternary ammonium salt, and 34.3g sodium hydroxide are added to DMSO at 45°C for reaction After 12 hours, cool to room temperature, adjust the pH to 6-7 with hydrochloric acid, concentrate the reaction solution, and recrystallize from methanol to obtain chitin morpholine quaternary ammonium salt. 1 HNMR (DMSO, d6) 1.95(s, 3H), 3.19(s, 3H), 3.31(s, 3H), 3.45(m, 4H), 3.53~3.60(m, 11H), 4.37~4.53(m, 5H) ), 4.78 (s, br, 1H), 5.23 (s, br, 1H), 7.92 (s, 1H).
preparation example 3
[0023] The preparation method of the chitin morpholine quaternary ammonium salt is as follows: under nitrogen protection, 100g chitin, 99.6g trimethylglycidyl quaternary ammonium salt, 68.6g sodium hydroxide are added to DMSO at 35°C for 12 hours, cooled to room temperature, adjusted the pH to 6-7 with hydrochloric acid, concentrated the reaction solution, and recrystallized from methanol to obtain chitin morpholine quaternary ammonium salt. 1 HNMR (DMSO, d6) 1.95(s, 3H), 3.20(s, 7H), 3.31(s, 3H), 3.51~3.60(m, 6H), 4.37~4.53(m, 4H), 4.75(s, br , 1H), 5.22 (s, br, 1H), 7.92 (s, 1H).
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