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Gastrointestinal and tissue levels of nickel in deer mice Peromyscus maniculatus and woodrats Neotoma fuscipes from serpentine and non-serpentine areas

100%

Oswald C.

Acta Theriologica

2004

tom 49

nr 3

Serpentine geologic formations have soils high in nickel. Nickel exerts deleterious effects on several body systems, and often accumulates in organs of laboratory animals exposed to nickel. To establish if deer mice Peromyscus maniculatus Wagner, 1845 and dusky-footed woodrats Neotoma fuscipes Baird, 1858 of serpentine areas ingest nickel, and to determine if nickel accumulates in body tissues, I measured nickel in several organs and tissues of animals from serpentine and nonserpentine sites in southern Oregon. Nickel was present in significantly greater concentrations in the contents of the stomachs and small intestines of P. maniculatus and N. fuscipes from serpentine areas than in those of animals from nonserpentine areas. Nickel was not detected, or was present in only trace amounts, in the livers, kidneys, spleens, hearts, lungs, brains, skeletal muscles, and bones of both species from both serpentine and nonserpentine sites. P. maniculatus from serpentine areas had significantly greater concentrations of nickel in the seminal vesicles, testes, and uteri and ovaries than did P. maniculatus from nonserpentine areas.

Ocena poziomu kobaltu i niklu w sniadaniowych produktach zbozowych i ziemniaczanych

70%

Zareba S. , Zareba-Giezek M. M. , Krzysiak K.

Bromatologia i Chemia Toksykologiczna

2005

tom 38

nr 1

35-39

W wybranych śniadaniowych produktach zbożowych (nestle, müsli) i ziemniaczanych (chipsy) oznaczono zawartość kobaltu i niklu, metodą absorpcyjnej spektrometrii atomowej. Próbki po spaleniu w tyglach kwarcowych nad płomieniem palnika mineralizowano w piecu muflowym w temp. 450°C a jony pierwiastków przeprowadzono w połączenia chelatowe z APDC ( 1-pirolidynokarboditionian amonu) i wyekstrahowano do fazy organicznej MIBK (4-metylopentan-2-on).

Cereal and potato breakfast products were studied for their cobalt and nickel contents by atomic absorption spectrometry (AAS). These elements are necessary for proper functioning and development of human organism, they are cofactors of numerous enzymes and anti-oxidants but, in execessive quantities, they are toxic. Cobalt, a very important cofactor of vitamin B12, was found in greatest content in cereal products with nuts. Higher contents of nickel were detected in nestle flakes with additives, due to high content of Ni in the additives. Execessive levels of the studied elements (and of nickel, which in excessive quantities causes allergy by histamine activation) were not detected in any of the studied products or product series. The products are safe and do not bring any danger to consumers health (including children and youths).