Tensiometry as a Simple Analytical Method for Quantification of Solubility and Release of Aroma Molecules in Aqueous Media.

Ruth Kudla,Larisa A Tsarkova,Jochen S Gutmann

doi:10.3390/molecules26247655

Abstract

Dynamic tensiometry is shown to be a high-potential analytical tool in assessing physico-chemical characteristics of fragrance molecules, such as solubility limit, volatility as well as much rarely assessed interfacial activity of these amphiphilic molecules. Surface tension of aqueous solutions of selected essential oils has been measured as a function of time and fragrance concentration using maximum bubble pressure method. The effect of the temperature and saline solution on the rate of dissolution in water was assessed. Dynamic surface tension turned to be sensitive to the composition of fragrances, as demonstrated on examples of natural and synthetic mixtures. Furthermore, presented work reveals the possibility of maximum bubble pressure tensiometry method to quantify the amount of fragrance compositions in flavored salts, including the artificially aged carrier samples. Suggested here analytical approach can be used for the detection of the purity of essential oils, for the optimization of compositions and of the manufacturing processes of fragrances-containing products, as well as for the assessment of the release/evaporation of fragrances from carrier systems.

Highlights

Perfumes, besides being noble products themselves, are often added as components to the products in cosmetic, textile, wellness or home-care branches in order to add a superior quality and to influence the consumer behavior
That rich and complex compositional variability of these poorly water soluble volatile amphiphiles defines their specific surface-active properties which can be assessed with tensiometry methods [6,7]
The rapid reduction of the surface tension of water is an indication of the fast diffusion and adsorption of a solute at water-air interface. We note that this fast adsorbing behavior is a remarkable feature of poorly soluble aroma molecules as compared to conventional technical surfactants, as well as to the solutions of highly soluble short-chain alcohols [6]

Summary

Introduction

Besides being noble products themselves, are often added as components to the products in cosmetic, textile, wellness or home-care branches in order to add a superior quality and to influence the consumer behavior. In this work dynamic tensiometry, i.e., the assessment of the time evolution of the surface tension, is shown to be a useful analytical tool in evaluating quantitative physicochemical characteristics of fragrance molecules, such as solubility limit, volatility, and interfacial activity.

Results

Conclusion