In the art of perfumery, the persistence or the ability to retain fragrance is closely related to the effect of fixing fragrance (preserving fragrance). The so-called aroma persistence refers to the limit of the fragrance retention time in a certain medium or matrix under certain environmental conditions, such as temperature, humidity, pressure, air circulation, volatilization area, etc. The longer the time limit, the stronger the persistence (longer fragrance retention time); the shorter the longer the longer duration (shorter fragrance retention time). Except for special reasons or requirements, it is always desirable to have as long as possible the longer the better, and to maintain its original aroma or aroma characteristics for as long as possible.
The persistence of the aroma of a spice can be judged by smell or by weighing. Examining the persistence of flavors, especially in flavored products, is much more complicated than flavors. At present, it is still a relatively simple, fast and effective way to use human sense of smell to evaluate the persistence of essences (including in flavored products). Of course, it can also be supplemented by instrumental analysis, such as the results of headspace analysis for comprehensive evaluation.
The persistence of fragrance aroma is generally related to their relative molecular weight, vapor pressure, boiling point (or melting point), chemical structure characteristics or functional group properties, chemical activity and so on. It is generally believed that fragrances with strong persistence are used as body fragrance and base fragrance components in essences, and those with strong fragrance persistence and certain diffusing power are suitable for use as top fragrance components.
Persistence of fragrance aroma is not only related to the fragrance persistence and amount of each fragrance in it, but also to the aroma harmony between the fragrances and the performance of the fixative used. On the premise of not hindering the aroma type or aroma characteristics, spices or fixatives with lower vapor pressure, slightly larger relative molecular mass and higher viscosity are often used to achieve better persistence and fixative effect. However, at the same time, it is necessary to take into account the transparency of the fragrance (including the fragranced products) and the harmony between the fragrances, that is, to make the top fragrance, body fragrance and base fragrance of the fragrance in close harmony with each other, so as to make The entire aroma emerges slowly and evenly from the fragranced product.
