Several reactions between components of packaging materials lead under certain circumstances to sensorially active compounds, which dimmish the quality of the package and often the quality of the packaged food The conjugated unsaturated car bonyl compounds constitute an important class with may examples of such reaction products with off-odor properties This paper will attempt to evaluate off-odors in special consideration of this class of organic compounds
The diffusion and partition coefficients (relative solubility constants) of n‐alkanes (from carbon nos. 12–32) have been determined by a permeation method (pouch method) for the polyolefines LDPE, HDPE, and PP–copolymer, and PP–homopolymer at room temperature. The activation energies for the diffusion are interpreted in the meaning of the rate transition theory. Correlations exist between the activation energy ΔE and the heat of vapourization ΔvHs as well as between the activation energy ΔE and the Arrhenius preexponential factors D0. These correlations are useful for the prediction of the diffusion coefficients of n‐alkanes with carbon numbers larger than 32.
SynopsisThe diffusion and partition coefficients (relative solubility constants) of n-alkanes (from carbon nos. 12-32) have been determined by a permeation method (pouch method) for the polyolefinea LDPE, HDPE, and PP-copolymer, and PP-homopolymer at room temperature. The activation energies for the diffusion are interpreted in the meaning of the rate transition theory. Correlations exist between the activation energy AE and the heat of vapourization A,H, as well as between the activation energy A E and the Arrhenius preexponential factors Do. These correlations are useful for the prediction of the diffusion coefficients of n-alkanes with carbon numbers larger than 32.
JOHANNES KOSZINOWSKI Fmunhofer-Imtitut fur LebemrnitteltechnoJogie und Verpackung, Schragenhofstrasse 35, 8000Munchen 50, Germany synopsis The diffusion and relative solubility coefficients of some alcohols, phenols, and antioxidants have been measured by a permeation method for LDPE at room temperature. The diffusion coefficients of the hydroxy compounds are compared with those of the alkanes. The diffusion coefficients of the alkanes mark out upper limiting values which are not exceeded by the hydroxy compounds of comparable molecular weight.tice. As polyolefine we have chosen LDPE.
Physical/chemical compatibility is discussed as the primary factor in minimizing the reaction and interaction of components of the food with components of the packaging material. The key variables which determine the interaction are diffusion, partition, sorption and desorption constants. Examples are given for the migration and permeation of volatile and non-volatile compounds. An example shows the importance of considering the possibility of harmless components of the packaging material reacting to form organoleptic-active substances.
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