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Biomedical subjects

C Nerín

Publications and source records attributed to C Nerín.

24 records · Page 2Linked to original sources
PubMed1992

Determination of lead in wines by hydride generation atomic absorption spectrometry.

The optimization of lead hydride generation in aqueous ethanolic media and the influence on its generation of the wine components, both white and red, have been studied. These interferences were overcome by careful control of the parameters affecting hydride generation and the procedure was applied to the determination of Pb in wines. The method is fast, accurate and sensitive and can be used to quantify 24 ppb of Pb in wines.

Lead↗
PubMedDate not supplied

Plasticizers from printing inks in a selection of food packagings and their migration to food.

A survey of plasticizers in printing inks present in a selection of food packaging including confectionery, snacks, crisps, potatoes, chocolate bars and biscuits, has been carried out both in England and Spain. The identification of the polymer used as packaging showed that almost all of them were oriented polypropylene. Printing inks that are always used on the outer surface contain phthalates as major plasticizers, N-ethyl- and N-methyl-toluenesulphonamides and tris(2-ethylhexyl)trimellitate were found in some of the samples studied. Several food samples were also analysed to check the level of plasticizers migrating from printing inks.

Data Collection↗
PubMedDate not supplied

Behaviour of Chimassorb 81 in the recycling process of agricultural films used as soil covers.

Two different films, low density polyethylene (LDPE) and an ethylene-vinyl acetate copolymer (EVA), used as agricultural soil covers were studied. The films were recycled five and ten times respectively, and both the tensile strength and the content of Chimassorb 81, a UV-stabilizer, were analysed in each cycle. Losses of 17.44% in tensile strength and 23.69% (Thermic film) and 13.22% (EVA) in the concentration of Chimassorb 81 were found after five recycling cycles. The extraction of Chimassorb 81 from the film is optimized. As these films can be recycled for the same application or even for use as food-contact materials, the standard migration tests with established simulants have been carried out. The results obtained are discussed.

Agriculture↗
PubMedDate not supplied

Determination of plastic monomers in water by solid-phase microextraction coupled with liquid chromatography.

A method is presented for the determination of 2 major plastic monomers, terephthalic acid and vinyl acetate, which are widely used to manufacture plastics that come in contact with foods. The analytes are extracted from aqueous solution by using solid-phase microextraction, followed by quantitation by liquid chromatography (LC) with UV detection. Multivariate optimization was applied and is described. The optimized method has linear ranges of 5-150 microg/g for terephthalic acid and 7.5-100 microg/g for vinyl acetate. Coefficients of variation at a spiking level of 20 microg/g were 13.6% for terephthalic acid and 3.1% for vinyl acetate; detection and quantitation limits were 0.59 and 1,99 microg/g, respectively, for terephthalic acid and 1.56 and 5.20 microg/g, respectively, for vinyl acetate. The characteristics of both the extraction technique and its coupling with LC are described and discussed.

Chromatography, Liquid↗