Contaminação de produtos de higiene e cosméticos por n-nitrosaminas

N-nitrosamines are carcinogenic compounds that have been found during the last three decades in a variety of consumer products, including cosmetic and personal care products, and their raw materials. These compounds are formed from amine precursors and nitrosating agents present in the formulations. This paper reviews the formation and occurrence of N-nitrosamines in cosmetic products, as well as presents considerations about analytical, toxicological and regulatory aspects.

De natura metallorum

Arkit: 1 arkintunnukseton lehti, A-B4 C3.

De elementorum natura in genere

Arkit: 1 arkintunnukseton lehti, A4 B1.

De physica natura & constitutione

Painovuosi nimekkeestä.

Consideratio finium in rerum natura

Invocatio: Numinis auspiciis.

De cultu Dei externo natura demonstrato

Invocatio: D.D.

Avaliação de procedimentos de preparo de amostra de amendoim in natura para análise de aflatoxinas

The variability in aflatoxin B1 concentration among peanut subsamples of 4 sample preparation procedures was evaluated. For each procedure, 18 samples were prepared involving dry comminuting/homogenization or dry roughly comminuting followed by the preparation of a aqueous slurry. Ten analytical samples were withdrawn from each sample/procedure and analyzed by thin layer chromatography. The coefficient of variation (CV%) among each set of 10 analytical samples was assumed to be associated with the sample preparation procedure. The procedure that made use of a subsample mill and preparation of a subsample slurry, showed lower variability (CV%) among the analytical subsamples.

De principiorum chymicorum natura et indole

Invocatio: Q.F.F.Q.F.S.S.T.

Olfactus natura

Invocatio: KREIKKAA Alpha, omega.

De natura acidorum

Eric Sellin [ruots. pr.], Elisabeth Sellin s. Thelaus [ruots. pr.], Fridericus Hofverberg.

De natura acidi carbonici

Arkit: 1 arkintunnukseton lehti, A-B4 C1.

Origo et natura carminis bucolici

Arkit: 1 arkintunnukseton lehti, A-C4.

De natura et indole theologiae naturalis

Invocatio: D.D.

De natura acidi nitrici

Dedicatio: Carl Lundström [ruots. pr.], Henric Ståhlström [ruots. pr.].

Níveis de contaminantes inorgânicos em cachaças da região do Quadrilátero Ferrífero armazenadas em copos in natura de esteatito (pedra-sabão)

The levels of inorganic contaminants (As, Cd, Cu, Ni and Pb) were measured in 18 Brazilian spirit beverages, before and after 4 contact cycles of 24h each with in natura soapstone (steatite) cups. Results were compared to Brazilian regulation levels. Spirits contained As, Cd, Ni and Pb within permitted levels. For Cu, 5.6% of the brands were above the limit. The contact with soapstone cups decreased Cu levels in the spirits, while the other elements remained unchanged. The use of in natura soapstone cups was considered safe because this kind of vessel did not transfer inorganic contaminants to the spirits.