Novel submicron poly(urea‐formaldehyde) and essence of jasmine microcapsules with enhanced sustained release

A novel type of sub‐microcapsules was prepared using linoleic acid as the emulsifier for a nano‐sized (55.5 nm) essence of jasmine emulsion. The final sub‐microcapsules had well‐defined spherical structures with a mean diameter of 860 nm, and were generated by in situ polymerization. They were consisted of an essence of jasmine emulsion as the core and poly(urea‐formaldehyde) (PUF) as the shell. In comparison to microcapsules prepared by analogous methods and materials, these sub‐microcapsules had a smaller particle diameter, resistance to boiling water and corrosion at pHs 3–11, a higher encapsulation efficiency of 92% and an increased length of release of approximately 22 days for the essence in water. The products reported in this study have potential applications in the flavor industry. Copyright © 2015 John Wiley & Sons, Ltd.