Generally nanoemulsion is prepared by first calculating solubility of drug in oil phase then further titrating it using water and the system stabilized by a surfactant. I want to know the preparation procedure if i am using a drug that is in oily state (for example clove oil). Will i have to perform any solubility study when my drug itself acts as an oil phase?
Is final product for topical (not parenteral) use? You can (i) solubilize an oily drug in ethanol and (ii) pour the solution into aq. solution of a solubiliser, such as Tween 80 or Cremophor 40/60, with proper concentration. The result is clear and stable micellar solution. We use the same procedure to prepare, e.g. aqueous propolis solution.
For a drug (for exam liquid hydrophobic drugs) which is stable (not volatile) in nature then you may directly prepare nanoemulsion from there without incorporating any lipid.
If drug is unstable then its advisable you to choose a lipid which have lower m.p (better solid at room temperature) to dissolve lipid and prepare nanoemulsion from lipid mixtures; it would retain incorporated lipid at core site
For a drug (for exam liquid hydrophobic drugs) which is stable (not volatile) in nature then you may directly prepare nanoemulsion from there without incorporating any lipid.
If drug is unstable then its advisable you to choose a lipid which have lower m.p (better solid at room temperature) to dissolve lipid and prepare nanoemulsion from lipid mixtures; it would retain incorporated lipid at core site
Solubility studies are not required in such case. Solubility studies are usually carried out to screen the best components especially oil phase for nanoemulsion preparation.
Nevertheless, if you are using a vegetable oil as an active component like olive oil, you can use other oil along with vegetable oil because vegetable oils have lot of impurities which is the main hurdle for getting clear nanoemulsion. In this case use any of semi-synthetic oil such as Sefsol, Labrafil, Capryol, Lauroglycol etc. Entrap your active oil with this oil and follow the routine procedure of nanoemulsion preparation. I have forwarded you one article which would help and answer your query.
Related to the method of preparation, take into account that depending on the components you may need to add some energy to the system (i.e. using an ultraturrax) to get a nanoemulsion, otherwise you will obtain a coarse emulsion. However, if the choice of excipients is correct, you will obtain a thermodynamically stable microemulsion.
In case of some oils, maybe also for clove oil nanoemulsions will suffer from Ostwald ripening. If you add a second oil of lower aqueous solubility Ostwald ripening can be suppressed.
Dear Usama Ahmad
You can find my newly published article with exactly match subject with the matter you asked about it; through below Researchgate link.
“Shahavi M. H., Hosseini M., Jahanshahi M., Meyer R. L. and Najafpour G. D. (2015) Clove oil nanoemulsion as an effective antibacterial agent: Taguchi optimization. Desalination and water treatment, Taylor & Francis, Impact Factor: 1.173, ISSN: 1944-3994, DOI: 10.1080/19443994.2015.1092893”
Article Clove oil nanoemulsion as an effective antibacterial agent: ...
Also, you can see my other newly published article in this area, from below link.
“Shahavi M. H., Hosseini M., Jahanshahi M., Meyer R. L. and Najafpour G. D. (2015) Evaluation of critical parameters for preparation of stable clove oil nanoemulsion. Arabian Journal of Chemistry, Elsevier, Impact Factor: 3.725, ISSN: 1878-5352, DOI: 10.1016/j.arabjc.2015.08.024”
Article Evaluation of critical parameters for preparation of stable ...
- Badges
- Science topic
- Similar topics
- Correction