Summary
Potentiometry with an ion-selective electrode as well as a cation-chelate-exchange procedure (combined with AAS) are presented as useful methods for the determination of stabilities of element species, for example of calcium in milk. The cation-exchange procedure is also applicable to other metals (e.g., magnesium) and other foodstuffs (e.g., meat extracts). New results of Ca- and Mg-extractabilities by the use of different aqueous extraction solutions (including enzymic solutions) are reported. Ultrafiltration, dialysis and gel-chromatography are further methods especially for the separation and analysis of protein-containing element species. Unoccupied binding fields can be detected after addition of Cu(II) ions by combination of gel chromatography and UV/VIS spectroscopy, as shown by example of rape-flour. The experiences gained in the analysis of element species in foodstuffs are combined to a strategy of analysis.
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Literatur
Schwedt G, Weber G (1983) Dtsch Lebensm Rundsch 79:213
Schwedt G (1984) GIT Fachz Lab 28:1013
Weber G, Schwedt G (1982) Anal Chim Acta 134:81
Bischoff R, Schwedt G (1982) Anal Chim Acta 142:109
Thiele A, Schwedt G (1985) Z Lebensm Unters Forsch 180:126
Crews HM, Burell JA, McWeeny DJ (1985) Z Lebensm Unters Forsch 180:405
Kohn R, Dongowski G, Bock W (1986) Die Nahrung 30:39
Jaynes HO, Whitney RM (1982) J Dairy Sci 65:1074
Martin MT, Jacobs FA, Brushmiller JG (1984) J Nutr 114:869
Hazell I (1982) J Sci Food Agric 33:1049
Matsushita S (1985) Anal Chim Acta 172:249
Schwedt G, Wedepohl K, Zöltzer D (1983) Fresenius Z Anal Chem 315:610
Dunemann L, Schwedt G (1986) Fresenius Z Anal Chem 325:121
Craggs A, Moody GJ, Thomas JDR (1979) Analyst 104:961
Schläfer HL (1961) Komplexbildung in Lösung, Springer, Berlin Heidelberg New York, S 307
Weber G, Schwedt G (1983) Fresenius Z Anal Chem 316:594
Dunemann L, Schwedt G (1984) Fresenius Z Anal Chem 317:394
Meisch HU, Beckmann I, Schmitt JA (1983) Biochim Biophys Acta 745:259
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Schwedt, G., Metschies, M., Schweizer, A. et al. Zur Methodik der Elementspezies-Analytik in Lebensmitteln. Z. Anal. Chem. 327, 142–148 (1987). https://doi.org/10.1007/BF00469807
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DOI: https://doi.org/10.1007/BF00469807