Colon-targeted pro-drug based on nanometer cellulose carrier and preparation method of colon-targeted pro-drug
A nano-cellulose and colon-targeting technology, which can be used in pharmaceutical formulations, medical preparations with non-active ingredients, anti-tumor drugs, etc., can solve the problems of difficult chemical bonds breaking, no practical application value, and limited targeting activity. The effect of good encapsulation and good drug controlled release performance
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Embodiment 1
[0020] Weigh 1 g dry sample of nanocellulose, 0.08 g 4-dimethylaminopyridine (DMAP), 1.5 g alanine, 1.25 g 1-ethyl-(3-dimethylaminopropyl) carbodiimide salt Hydrochloride (EDC·HCl), 0.75 g of fluorenylmethoxycarbonyl chloride (Fmoc-Cl), 50 mL of dimethyl sulfoxide was added, the reactants were mixed evenly, and the reaction was performed under magnetic stirring at room temperature for 20 h. After the reaction was completed, the liquid was removed by centrifugation at 9000 rpm, and then the remaining solid sample was washed with deionized water multiple times, and then washed twice with ethanol solution to obtain an Fmoc-protected amino nanocellulose sample. To remove Fmoc protection, disperse it in 20 mL of 10% (v / v) piperidine / DMF solution, stir for 20 min to remove Fmoc, and obtain amino acid esterified nanocellulose, which is vacuum-frozen at -53°C Dry the sample.
[0021] Weigh 0.1 g dry sample of amino acid esterified nanocellulose, 0.3 g N-hydroxysuccinimide (NHS), 0.3 ...
Embodiment 2
[0023]Weigh 1 g dry sample of nanocellulose, 0.08 g 4-dimethylaminopyridine (DMAP), 1.5 g leucine, 1.25 g 1-ethyl-(3-dimethylaminopropyl) carbodiimide salt Hydrochloride (EDC·HCl), 0.75 g of fluorenylmethoxycarbonyl chloride (Fmoc-Cl), 50 mL of dimethyl sulfoxide was added, the reactants were mixed evenly, and the reaction was performed under magnetic stirring at room temperature for 20 h. After the reaction was completed, the liquid was removed by centrifugation at 9000 rpm, and then the remaining solid sample was washed with deionized water multiple times, and then washed twice with ethanol solution to obtain an Fmoc-protected amino nanocellulose sample. To remove Fmoc protection, disperse it in 20 mL of 10% (v / v) piperidine / DMF solution, stir for 20 min to remove Fmoc, and obtain amino acid esterified nanocellulose, which is vacuum-frozen at -53°C Dry the sample.
[0024] Weigh 0.1 g dry sample of amino acid esterified nanocellulose, 0.5 g N-hydroxysuccinimide (NHS), 0.5 g...
Embodiment 3
[0026] The filter paper was disintegrated in a fiber standard disintegrator at 3000 r / min for 20 minutes to obtain a uniformly dispersed filter pulp, which was freeze-dried for later use. Take 3.0 g of dried filter pulp, stir and disperse in 100 mL of acetic acid solution, and let it stand overnight (15 h) to preactivate the cellulose. Then 1.5 mL of concentrated sulfuric acid was added dropwise as a catalyst, and the suspension was placed in an oil bath at 80 °C and stirred at 300 r / min for 6 h. After reacting for a certain period of time, the reaction system was ultrasonically treated at an ultrasonic frequency of 40 kHz, a power of 250 W, an ultrasonic temperature of 75 °C, and an ultrasonic time of 5 h. After the reaction was completed, the suspension was centrifuged repeatedly with deionized water at 9000 r / min, and then unreacted reagents and by-products were eluted with acetone / ethanol mixture (1 / 1 volume ratio). Finally, the collected maleic anhydride esterified nanoc...
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