Petrolatum-based delivery systems and for active ingredients
The present disclosure is broadly concerned with petrolatum-based compositions as a suspension matrix for the active ingredients. The disclosure is also concerned with processes for forming stable emulsions of active ingredients in petrolatum.
1. A process for preparing a stable petrolatum-based composition comprising petrolatum and an active ingredient soluble in a polar solvent, the process comprising:
a) dissolving the active ingredient in a polar solvent to give an active ingredient solution;
b) heating the petrolatum to a temperature sufficient to cause the petrolatum to melt to give a melted petrolatum and heating the active ingredient solution to a temperature higher than the temperature of the melted petrolatum to give a heated active ingredient solution;
c) mixing the melted petrolatum and the heated active ingredient solution to give a melted mixture; and
d) cooling the melted mixture to give the petrolatum-based composition, wherein the petrolatum-based composition comprises greater than 80% by weight petrolatum and contains no emulsifier.
2. The process according to claim 1 , wherein the heated active ingredient solution has a temperature that is about 1° C. to about 5° C. higher than the temperature of the melted petrolatum.
3. The process according to claim 1 , wherein the active ingredient is a water-soluble active ingredient.
4. The process according to claim 3 , wherein the polar solvent comprises water.
5. The process according to claim 1 , wherein the active ingredient comprises less than 1% by weight of the petrolatum-based composition.
6. The process according to claim 1 , wherein the composition is greater than 90% by weight petrolatum.
7. The process according to claim 1 , wherein the polar solvent and active ingredient are dispersed in the petrolatum in the form of nanodroplets.
8. The process according to claim 7 , wherein the nanodroplets range in size from about 10 nm to about 10,000 nm.
9. The process according to claim 1 , wherein the composition further comprises one or more compounds selected from the group consisting of TGF-alpha, TGF-beta, platelet-derived growth factor (PDGF), epidermal growth factor (EGF), fibroblast growth factor also referred to as keratinocyte growth factor (FGF), vascular endothelial growth factor (VEGF), insulin-like growth factor (IGF), connective tissue growth factor (CTGF), activin, interleukin 1, TNFα, and GM-CSF.