By T. R. Crompton
Plastics at the moment are getting used on a wide scale for the packaging of fatty and aqueous foodstuffs and drinks, either alcoholic and non-alcoholic. hence it truly is most probably that a few move of polymer ingredients will ensue - adventitious impurities similar to monomers, oligomers, catalyst remnants and residual polymerisation solvents and coffee molecular weight polymer fractions - from the plastic into the packaged fabric with the resultant chance of a poisonous danger to the patron. This e-book covers all elements of the migration of additions into nutrition and provides unique details at the analytical decision of the ingredients in a number of plastics. This booklet can be of curiosity to these engaged within the implementation of packaging laws, together with administration, analytical chemists and the brands of meals, drinks, prescribed drugs and cosmetics and likewise clinical and toxicologists within the packaging undefined. --------------------------------------------------------------------------------
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Additional resources for Additive Migration from Plastics into Food; A Guide for Analytical Chemists
Sample text
Pipette a 25 ml aliquot into a 100 ml separatory funnel, followed by 25 ml of cyclohexane. Shake the separatory funnel vigorously every ten minutes for half an hour. Allow the layers in the funnel to separate. Place an aliquot of the (upper) cyclohexane layer in the sample cell of the spectrophotometer and record a spectrum of the extractant and of a sample of cyclohexane using a 1 cm cell containing cyclohexane in the reference beam. Then obtain the optical density of the Santonox R absorption at 250 nm.
The low gas permeability of the film has been utilised in sachets for vacuum packed foods, such as cheese slices and bacon. Moulded articles in polyamide are widely used in food manufacturing processes. The fact that polyamides are self lubricating and consequently do not require the addition of a lubricant additive is a particularly important factor in the food industry where contamination by lubricants cannot be tolerated. 1 Polymethylmethacrylate This is a very clear plastic with good light exposure properties.
C) Extractants - 50% w/v ethyl alcohol in water Evaporate 80 ml of solution, in small portions to dryness, portion-wise, in a 100 ml beaker on a steam bath. Transfer the residue with small portions of ether to a 2 ml graduated flask and finally dilute to volume with ether. (d) Extractant - Medicinal paraffin BP Levis Weigh 40 g of sample into a 100 ml separating funnel and dilute with 60-80 °C petroleum spirit to approximately 100 ml. 5 cm) of chromatographic grade silica gel which has been activated by heating at 140 °C for 1 hour.