Percorrer por autor "Bolognesi, Claudia"
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- Optimizing Urine derived cells staining for the Human Micronucleus AssayPublication . Esteves, Filipa; Amaro, Raquel; Silva, Susana; Costa, Solange; Costa, Carla; Bolognesi, Claudia; Teixeira, João PauloEpidemiological studies commonly associate the incidence of cancers with the exposure to genotoxicants. This exposure may be analyzed using effect biomarkers allowing an early detection of health alterations. Micronucleus assay constitutes a useful tool to detect chromosomal damage, genomic instability and carcinogenic events. Cancers are usually from epithelial origin, and therefore micronucleus test (MN) in urine derived cells (UDC) assumes a great role on toxicological studies. Sampling of UDC is an easy and minimally invasive procedure, representing an advantage in human biomonitoring studies. The main concern related with UDC is the lack of standardization of MN protocol. Data show a large variability of the method, in particular what concerns to staining procedure, which may lead to bias. The use of different methodologies regarding MN in UDC may contribute to the large inter-laboratory variations and consequently for inconsistencies among studies. Aim: i) Select the most reliable method to stain UDC of those most commonly used - Giemsa and Feulgen. Giemsa - staining permits a quick preparation of slides for microscopic evaluation, however it is a non-DNA-specific stain which may favor false positive readings through the presence of other cellular structures (nonnuclear bodies, bacteria or keratohyalin granules). Feulgen - staining, although more time consuming, is a DNA specific stain which allows a good contrast between DNA material and cytoplasm; ii) Establish a detailed set of criteria for scoring all of the biomarkers in UDC; iii) Standardize the application of the mn assay in UDC.
- Re‐assessment of the risks to public health related to the genotoxicity of styrene present in plastic food contact materialsPublication . EFSA Panel on Food Contact Materials (FCM); Claude, Lambré; Crebelli, Riccardo; Silva, Maria Da; Grob, Konrad; Lampi, Evgenia; Milana, Maria Rosaria; Pronk, Marja; Ščetar, Mario; Theodoridis, Georgios; Van Hoeck, Els; Waegeneers, Nadia; Bolognesi, Claudia; Consiglio, Emma Di; Mengelers, Marcel; Al Harraq, Zainab; Pilar, Irene Muñoz; Rainieri, Sandra; Rivière, GillesThe EFSA Panel on Food Contact Materials (FCM) was requested by the European Commission to re‐evaluate the potential genotoxicity of styrene after oral exposure and its safety for use in plastic FCM with a specific migration limit (SML) of 40 μg/kg food. A rigorous assessment of the in vivo genotoxicity studies (i) provided by third parties, (ii) identified by a targeted literature search and (iii) reported in the 2019 IARC Monograph was performed. All studies were assessed for reliability and relevance and the results integrated in the weight of evidence. The results provided by reliable in vivo oral genotoxicity studies, covering different genetic endpoints and target tissues, including liver, the primary site of metabolism, demonstrated that the oral administration of styrene in mice and rats up to the maximum tolerated dose (300 and 500 mg/kg body weight (bw), respectively) did not induce genotoxic effects. The Panel concluded that there was no evidence that styrene is genotoxic following oral exposure. For substances demonstrated to be non‐genotoxic, according to the EFSA Note for Guidance for FCM, an SML up to 50 μg/kg food would not be of safety concern. Consequently, the use of styrene in the manufacture of FCM respecting the SML of 40 μg/kg food proposed by the European Commission is not of safety concern.
- Update of the safety assessment of N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amines (FCM No 19) and N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine hydrochlorides (FCM No 20) for their use in plastic materials and articles intended to come into contact with foodPublication . EFSA Panel on Food Contact Materials (FCM); Lambré, Claude; Crebelli, Riccardo; Silva, Maria de; Grob, Konrad; Lampi, Evgenia; Milana, Maria Rosaria; Pronk, Marja; Ščetar, Mario; Theodoridis, Georgios; Van Hoeck, Els; Waegeneers, Nadia; Bolognesi, Claudia; Cariou, Ronan; Castle, Laurence; Di Consiglio, Emma; Franz, Roland; Wölfle, Detlef; Al Harraq, Zainab; Barthélémy, Eric; Comandella, Daniele; Vela, Julia Fontán; Halamoda, Blanka; Rivière, GillesThe European Commission asked EFSA to review whether the authorisation of N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine (FCM No 19) and N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine hydrochlorides (FCM No 20) is still in accordance with Regulation (EC) No 1935/2004, as provided for in Article 12(3). The FCM Panel concluded that some uses of the substance N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine (FCM No 19) are not in accordance with this Regulation, since the migration is likely to exceed the current SML(T) of 1.2 mg/kg food under certain conditions of use. Based on the provided data, the FCM Panel concluded that the FCM substance No 19, N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine, is not of safety concern for the consumer if (i) the substance is used at up to 0.1% w/w as polymer production aid and as processing aid to manufacture polyolefin materials and articles of thickness up to 1 mm that are intended for contact with all types of food except infant foods. This exception for infant foods and the restriction for maximum thickness do not apply to caps of bottles; (ii) the migration does not exceed 5 mg/kg food; (iii) the source of the alkyl group is either from hydrogenated vegetable oil or synthetic from ethylene oligomers with a high degree of linear structure and (iv) the impurities do not exceed 5% w/w. As they bear unsaturation, PFAEO‐coco, PFAEO‐oleyl, PFAEO‐HT, PFAEO‐T and PFAO‐C18 do not fall within the scope of the FCM substance No 19. The information related to these substances was only considered supportive for FCM substance No 19. If they were intended to be used to manufacture FCMs, a proper application following the EFSA Guidance documents should be submitted. No uses of the FCM substance No 20, N,N‐bis(2‐hydroxyethyl)alkyl(C8‐C18)amine hydrochlorides, were claimed and no information was provided to support that the current authorisation is in accordance with the Regulation (EC) No 1935/2004.