Selamectin injection and preparation method thereof
A selamectin and injection technology, which is applied in the field of veterinary medicine, can solve the problems of poor water solubility of selamectin, and achieve the effects of reducing clinical dosage, reducing economic burden and good fluidity
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[0032] The preparation method of selamectin injection of the present invention is as follows:
[0033] (1) ethyl oleate, OP, n-butanol, water for injection and selamectin of formula quantity are taken for subsequent use;
[0034] (2) At room temperature, stir and mix the ethyl oleate, OP, n-butanol, and selamectin weighed in step (1) at a constant temperature until the drug is completely dissolved in the system, and no traces are visible to the naked eye. up to solids;
[0035] (3) Slowly add water for injection to the mixture, and stir while adding; at the beginning, the viscosity of the system is small, and as the amount of water increases, the system gradually becomes viscous, and when the liquid crystal phase changes in the system, it is W / O type injection Continue to add water for injection dropwise and stir constantly. When the amount of water reaches a certain amount, the system becomes clear and thin, and the fluidity becomes better, that is, O / W type injection; then ...
Embodiment 1
[0041] The formula of selamectin injection of the present invention is as follows:
[0042] Ethyl oleate 8mL, OP 12mL, n-butanol 10mL, selamectin 10g, ultrapure water 70mL.
[0043] The preparation method of selamectin injection of the present invention is as follows:
[0044] 1) Weigh 8 mL of ethyl oleate, 12 mL of OP, 10 mL of n-butanol, 10 g of selamectin, and 70 mL of ultrapure water;
[0045] 2) At room temperature, place the above-mentioned weight of ethyl oleate, OP, n-butanol, and selamectin on a constant temperature magnetic stirrer at 200-400rpm and stir until the selamectin is completely dissolved in the system , until no solid matter is visible to the naked eye;
[0046] 3) Slowly add ultrapure water to the mixture, and stir while adding; at the beginning, the viscosity of the system is small, and as the amount of water increases to 16mL, the system gradually becomes viscous, and at this time the system may appear liquid crystal phase or W / O (Water-in-oil type) ...
Embodiment 2
[0049] Continue to add water for injection dropwise to the system of Example 1 under the stirring condition of 200~400rpm. When the amount of water for injection reaches 170mL, a clear and transparent O / W type Selamectin content of 5% (W / V) is prepared. Laramectin injection, at this time, the content of other medical excipients is reduced to 15%, which are all within the dosage range of medical excipients; it is suitable for clinical use of animals with larger body weight such as cattle, horses, camels, and elephants, and the higher drug content can be reduced Dosage for injection.
[0050] 5% (W / V) selamectin injection is detected by transmission electron microscope, and the appearance of the injection prepared according to the formula is clear and translucent, light yellow liquid; the particle size distribution of emulsion droplets is between 10-100nm, and the average particle size 65nm.
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