Study of factors affecting the absorption of aroma compounds into low‐density polyethylene

Abstract

Abstract:A supercritical fluid extractionlgas chromatography method has been used to study the influence of different factors on the absorption of aroma compounds into low-density polyethylene. Factors studied included concentration of aroma substances, storage temperature, pH and interactive effects of different food components. There were no significant differences in the partition coefficients when the concentration of the flavours was varied between 0.1 and 10 mg kg-'.The storage temperature, however, affected the absorption significantly (P < 0.05), approximately twice as much was absorbed at 75°C compared with 5°C. Acidification to pH 3 with acetic acid did not significantly alter the amounts of the aromas being absorbed. Further, when occurring alone in the model solutions the aroma substances had much larger partition coefficients than when in mixtures with others, indicating an antagonistic effect of different aroma compounds on absorption. Olive oil and, thereby, the flavours dissolved in the oil, were absorbed in large amounts by the plastic. Extractions of plastic films stored in concentrated apple juice were successfully carried out. In addition to many unknown substances, nine of the 10 aromas used in the model solution were detected in the plastic stored in concentrated apple juice.

Influence of high pressure application on the nutritional, sensory and microbiological characteristics of sliced skin vacuum packed dry-cured ham. Effects along the storage period

“…In a similar way, after 50 days of refrigerated storage with different light conditions the odor intensity was also higher in HPP samples than in NT samples (Table 7). This increase in odor intensity with HPP could be related to the interaction of aroma compounds with the inner surface of packaging material in HPP samples (Nielsen, Jägerstad, & Öste, 1992). The odor intensity perception was not affected by light storage time (Table 3) nor did the different light conditions induce any difference ( Table 7).…”

Development of an Analytical Procedure to Determine Partition Coefficients of Selected Model Migrants between Lowdensity Polyethylene and Polyamide and Nanocomposite Polyamide

“…Indeed, the partition coefficient of a series of compounds with the same functional group (i.e. esters or aldehydes) increased with increasing carbon chain length [21,[25][26][27][28][29][30]. The alcohols in aqueous solutions increase its partition coefficients to increasing its molecular weight.…”

“…In effect, larger molecules are absorbed to a larger extent than the smaller ones and highly branched molecules are absorbed to a greater extent than linear molecule into non-polar polyolefins [29]. The differences between the polarity of migrant and polymer are key parameters in the absorption process [21].…”

“…Alcohols and short-chained esters (polar substances) have higher partition coefficients in the oil/polymer system than in the water/polymer system. Whereas, aldehydes (long carbon non-polar chains) have lower partition coefficients in the oil/polymer, than in the water/polymer [29]. In mixtures, some compounds exhibit a lower absorption rate that systems containing the individual compounds.…”

“…In mixtures, some compounds exhibit a lower absorption rate that systems containing the individual compounds. This effect could be explained due to the absorbed components changing the properties of polymer and/or the compounds competing for a limited number of active sorption sites [29,30]. When more than one type of solids are present, alcohols preferentially are adsorbed to the solid with higher affinity for alcohols, until all binding sites on the solid have been occupied.…”