Interactions between aroma compounds and latex films: partition coefficients and influence on latex film formation

Abstract

The potential of various latex grades to take up, retain and release different types of aroma compound has been explored. The latex grades used included two styrene-acrylate latices and two styrene-butadiene latices, of which one contained talc. The aroma compounds used were ethyl butyrate, 1-hexanol, heptanal, 3-octanone, a-pinene and limonene dissolved in propylene glycol. It was shown that talc improves both the uptake of aroma compounds in the dispersion phase and the retention during the film formation process. However, the styrene-acrylate latex had a greater ability than the styrene-butadiene latex to hold the aroma compounds once the films were formed. These results have been compared to calculated solubility parameters. The uptake of 1-hexanol and propylene glycol in the latex dispersions were higher than expected from the theoretical calculations, probably because of the amphiphilic nature of these molecules. In addition, the influence of aroma compounds on the film formation was evaluated.

Multivariate analysis of retention and distribution of aroma compounds in barrier dispersion coatings

“…This is in agreement with the findings of a previous study 20 and is probably an effect of talc. PC1 also shows that all aroma compounds were found in higher amounts in SA-2 than in SA-1.…”

“…20 SB latex without talc tends to take up and retain the nonpolar aroma compounds more than SA latex, whereas the uptake and retention of the polar aroma compounds seem to be higher in the SA latex. These results are in agreement with calculated solubility parameters.…”

“…Most of the added aroma compounds were lost during the film formation process. 20 Proportionally, the samples with the lowest amount of added aroma compounds (A) retained the highest amounts of aroma compounds. This is likely due to the fact that the number of potential absorption sites on the latex particles is limited.…”

“…However, large amounts of propylene glycol are hardly realistic in a real application, and latex matrices with and without this relatively large amount of propylene glycol do not behave in exactly the same way. 20 However, since the chosen experimental design relies on keeping the propylene glycol concentration constant, it is possible to study effects of the added aroma compounds on the latex-propylene glycol system without difficulties due to different solvent concentrations. At the same time, the aroma compound concentrations in the most concentrated latex systems, (D) and possibly also (C), are so high that these compounds themselves can be expected to alter the characteristics of the matrices considerably compared to those of the latex systems with lower aroma concentrations.…”

A new approach to studying sponge cake aroma after storage in treated paper and plastic packaging by direct gas chromatography–olfactometry (D‐GC–O)

“…Indeed, the four aroma compounds studied were hydrophobic (Table 2) and could interact with the hydrophobic latex-based coating. 29 The barrier properties of treated-papers would be lower than those of BOPP because first, BOPP is a dense material, like most plastic films, whereas treated papers would still contain some residual porosity, although they were both impregnated and then coated by substances filling up their pores and were both submitted to a calendering treatment which compressed the cellulose fibres and reduced porosity. [30][31][32] Second, the coating made up of latex polymer contains no crystalline region to act as a barrier for diffusion, such as in polyolefins.…”