Advances in preparation and controlled release of profragrances under ambient conditions

Abstract

Profragrances referred to the controlled release system, in which the fragrance molecules and the specific substrates are linked by the characteristic responsive bonding. Profragrances can release fragrances under mild reaction conditions. The controlled release property of profragrances can prolong the scented perception caused by the high volatility of the fragrance molecules, thereby satisfying the demands of many flavored products, especially in requiring long-lasting odor. Due to most flavored products are used in daily life, the controlled release of fragrances based on environmental conditions is given great attention. This review focuses on the preparation and controlled release of profragrances under mild environmental conditions, especially the profragrances with different pH-response or photo-response, as well as briefly introduce the unusual oxygen-response profragrances. Furthermore, it gives a new insight into the future direction of the design and research of profragrances.