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In the presence of oxygen, ascorbic acid (AA) is readily degraded to dehydroascorbic acid (DHA), which is prone to further degradation, hereby losing its vitamin C activity. In this study, the influence of different initial headspace O 2 concentrations on the oxidation of AA and the subsequent formation and breakdown of DHA was investigated in a model fruit juice. Kinetic rate constants for...
The absorption of d-limonene into polyethyleneterephthalate (PET) at different initial limonene concentrations and storage temperatures and the effect of this addition on the physical properties of PET were investigated. Strips of PET were immersed in model solutions (160 and 320ppm limonene) for 45 days at 5, 22 and 37 o C. The level of sorbed d-limonene and PET physical properties (tensile...
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