Long-lasting fragrances
Fragrance precursors usually consist of an olfactorily inert moiety which is covalently bound to the fragrance part of the molecule.
Bond cleavage and thus release of the fragrance can be triggered e. g. via humidity/pH, light, temperature, enzymes or oxidation. Generally, mild cleavage conditions are required which fit to usual conditions in the field of laundry and home care.
For cost reasons, a high content of fragrance with respect to the total mass of the fragrance precursor is preferred.
Fragrance precursors must be sufficiently stable in laundry and home care product formulations and should consider ecotox and toxicological requirements as fragrance chemicals in general. Long lasting effects are measured by analytical means or via olfactory assessment after respective application.
For benchmarking we compare the odor intensity of the precursor after certain evaluation times (up to one week) against the unbound fragrance chemical or state-of-the-art fragrance precursor technologies, respectively.