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. therefore it really is most likely that a few move of polymer ingredients will ensue - adventitious impurities akin to monomers, oligomers, catalyst remnants and residual polymerisation solvents and occasional molecular weight polymer fractions - from the plastic into the packaged fabric with the ensuing possibility of a poisonous risk to the shopper. This publication covers all points of the migration of additions into foodstuff and provides distinct details at the analytical selection of the ingredients in numerous plastics. This booklet should 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
Construct a calibration curve for Santonox R in 50% w/v ethanol in the concentration range 2 to 20 ppm. Suitable standard solutions may be prepared by quantitative dilution of a 100 ppm solution of Santonox R in neat ethanol adjusting the ethanol content of the standard solutions to 50% w/v. 27 times the concentration of Santonox R in the ethanolic solution prepared previously. • Using 5% w/v Citric Acid as Extractant Shake the vessel containing the test extractant vigorously to obtain a uniform haze of Santonox R in the citric acid solution.
The main interest to the food industry is again that of container closures and in the domestic field they are used as casings for domestic food mixers. 21 Melamine-formaldehyde Colourless white or pastel coloured mouldings can be produced from this resin using bleached wood pulp as a filler. Melamine-formaldehyde mouldings are more resistant to water than urea-formaldehyde resins and are not attacked by weak alkalies and they have a high heat resistance. Due to their superior water resistance, mouldings made in this resin have good staining resistance and have consequently been widely used in tableware.
Then obtain the optical density due to the Santonox R absorption at 250 nm. Construct a calibration curve for Santonox R in 50% v/v liquid paraffin in cyclohexane for concentrations ranging from 0 to 20 ppm. Compare the optical density obtained with the test extractant with the calibration curve and hence obtain the concentration of Santonox R in the test extractant. This concentration is one-half the concentration of Santonox in the extractant. It must be emphasised that methods based on direct spectroscopy of the extractant liquid such as that described previously are only capable of giving a correct analysis if no other substances which absorb at the same or a nearby wavelength are present in the extractant.