Add time:08/20/2019         Source:sciencedirect.com

The air/biopolymer partition coefficient (K) and percentage of retention (R%) of Ethyl butyrate (cas 105-54-4) (400 ppm) added to gellan gels were determined, using static headspace gas chromatography. Potassium chloride (40–120 mM) was used to induce gellan gelation. When 5 g of sample were left to equilibrate at 37 °C for 2 and 24 h, the coefficient values initially decreased with salt concentration to a certain value after which they raised again. The lower coefficient values, for the 24 h period, were observed at higher salt concentration than for the 2 h. Moreover, for both time periods, the lower coefficient values were found for the gellan gels with the greater strength and rigidity and were accompanied by positive percentages of retention. When 15 g of sample were used, after equilibration at 37 °C for 24 h, no significant changes in aroma release were observed. Moreover, negative percentages of retention values were calculated for all salt concentrations.

► Retention of ethyl butyrate by gellan gels differing in mechanical properties. ► Gels with greater strength and rigidity resulted in lower aroma release. ► Experimental conditions (sample mass, time of equilibration prior to analysis) are critical.

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