A Simple Method for Determination of Total Extractable Protein in Meat

Determination of total extractable protein (TEP) in meat by accepted methods may yield erroneously high results due to turbidity in the extracts subjected to protein determination. A method is proposed involving the use of a microfilter which clarifies the extract and thereby circumvents the problem. The new method also takes advantage of the observations that extraction may be carried out at room temperature after simple grinding through a 3 mm hole plate.     

ON THE POSSIBILITY OF PREDICTING PHASE EQUILIBRIA FROM MOLECULAR STRUCTURE

The abvent of the ASOG and UNIFAC group-contribution methods for the prediction of activity coefficients approximately 15 years ago was a significant boost to the ability of chemical engineers to model chemical processes. This paper reviews the status and recent progress in the group-contribution approach to predicting liquid-phase activity coefficients.Several different types of liquid mixtures arc considered: non electrolyte mixtures with normal-boiling components; mixtures with dissolved gases; mixtures with polymers; and mixtures including strong electrolytes. It is concluded that in recent years much progress has been made in the development of group-contribution models for the prediction of activity coefficients. It is in addition shown that combining activity coefficient models with equations of state renders the group-contribution approach applicable also to the highpressure region.Due to space limitation, this review emphasizes UNIFAC and related models.     

RECENT PROGRESS IN THE COMPUTATION OF EQUILIBRIUM RATIOS

The computation of equilibrium ratios plays an important role in any distillation design calculation. Three different types of models are used for generating equilibrium ratios in non-ideal mixtures:(1)Equations of state (2)Activity coefficient models (3)Group contribution methods Significant developments have taken place for all three types of models in recent years. New models have appeared, many model parameters have become available, and efficient and safe algorithms for implementing the models in distillation calculations have been proposed. The purpose of this contribution is to review these developments.