Gas chromatography determination of polychlorinated biphenyls in powdered and liquid soybean milks.
A method previously validated for the analysis of individual congeners of polychlorinated biphenyls (PCBs) in soybean infant formulas is now used to determine PCB levels in dairy-like soybean derivatives, including liquid and powdered soybean milks. Some differences were found among PCB levels and profiles calculated from the different liquid and powdered soybean milks investigated when compared to previously reported for soybean infant formulas, and those most common in dairy-products from Spain and from other countries. PCB levels detected in liquid soybean milks were lower than those found in powdered soybean milks. Levels reported for these two dairy-like derivatives were lower than those detected in soybean infant formulas. The most apparent difference among soybean derivatives and cow's milk was that individual PCB levels detected in the former were lower than those reported for the latter, except for congeners 126 and, specifically, 77, which showed the opposite trend. This feature was common to all soybean products investigated including infant formulas, powdered and liquid soybean milks.
Centro de Tecnología de los Alimentos, Universidad de Alcalá, Madrid, Spain.
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Ramos
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Torre
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Marina
D002849:Chromatography, Gas; D006801:Humans; D007223:Infant; D007225:Infant Food / Q000032:analysis; D007231:Infant, Newborn; D011078:Polychlorinated Biphenyls / Q000032:analysis*; D011208:Powders; D012996:Solutions; D012997:Solvents; D013025:Glycine max / Q000737:chemistry*
D011208:Powders; D012996:Solutions; D012997:Solvents; D011078:Polychlorinated Biphenyls