DERIVATION OF THERMODYNAMIC SORPTION EQUATION OF FLAVORS WITH PACKAGING FILMS .2.

A further approach to derive the thermodynamic sorption equation for a queous phase was performed by estimating the molar heat of sorption (D elta H-s) accurately. On the basis of the findings that the sorption o f a volatile compound depends on both its molar heat of mixing into fi lm and its enthalpy change toward film, the following equation could b e successfully derived: S = S-0 exp gamma [V-v[(delta(w) - delta(v))(2 ) - delta(c)(2)]/RT]. The plots of ln S into LDPE film vs the term of the equation gave more adequate improvement in the correlation (r = 0. 968). Taking into account the volatility (alpha) of a volatile compoun d from solution, further improvement of the equation was made: S = alp ha S-0 exp gamma [V-v[(delta(w) - delta(v))(2) - delta(c)(2)]/RT]. The plots of ln S/alpha vs the term of the equation for both sugar-ester and SDS solutions gave a sufficient correlation (r = 0.959). Furthermo re, the equation could be sufficiently applied to various polymers (PP , r = 0.931; EVA, r = 0.963; EVOH, r = 0.932).