Norfloxacin D crystal form, and preparation method, preparation and application thereof
A technology of norfloxacin and crystal form, applied in the field of norfloxacin D crystal form and preparation thereof, and can solve problems such as unfavorable preparations
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Embodiment 1
[0024] Embodiment 1: the preparation of norfloxacin D crystal form
[0025] Add 2 kg of ethanol, 5 kg of water, 150 g of glacial acetic acid, 1 g of disodium edetate, and 1 kg of norfloxacin into a 10 L three-neck flask. Heat to 70°C and stir for 0.5 hours. Filtrate while hot, adjust the filtrate to neutrality with ammonia water at 70°C, and continue stirring for 0.5h. The temperature was lowered to 10°C, a large amount of solids were precipitated, filtered, the filter cake was washed with water and dried at 105°C to obtain 0.91Kg of light yellow solid (yield: 91%), which was norfloxacin D crystal form. The X-ray powder diffraction pattern of norfloxacin D crystal form is as follows figure 1 As shown, the specific characterization is as follows:
[0026]
[0027] The chemical purity of obtained norfloxacin D crystal form detected by high performance liquid chromatography is measured to be 99.88% (see image 3 ), particle size distribution see Figure 4 . See Table 1 f...
Embodiment 2
[0034] Embodiment 2: Norfloxacin D crystal form prepares solid oral preparation
[0035] Take by weighing 200g of norfloxacin D crystal form, 52g microcrystalline cellulose, 2g hydroxypropyl cellulose, 12g croscarmellose sodium, 2g silicon dioxide, put in a multi-directional motion mixer and mix for 5min, then Add 2g of magnesium stearate and mix for 2 minutes; test the granule properties, start to compress the tablet after moisture determination, according to the theoretical tablet weight of 270mg, the hardness is 5-10kg, the difference of tablet weight is within ±5%, the total weight is 270g / 1000 tablets, the dissolution curve (compared with norfloxacin A crystal tablet prepared by the same method) see Figure 6 .
[0036] The crystal form D of norfloxacin provided by the invention has good stability and dissolution, and can be applied to the preparation of antibacterial drugs.
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