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Trace determination of lead in lipsticks and hair dyes using microwave-assisted dispersive liquid–liquid microextraction and graphite furnace atomic absorption spectrometry / K. Sharafi in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 37, N° 5 (10/2015)
[article]
Titre : Trace determination of lead in lipsticks and hair dyes using microwave-assisted dispersive liquid–liquid microextraction and graphite furnace atomic absorption spectrometry Type de document : texte imprimé Auteurs : K. Sharafi, Auteur ; N. Fattahi, Auteur ; M. Pirsaheb, Auteur ; H. Yarmohamadi, Auteur ; M. Fazlzadeh Davil, Auteur Année de publication : 2015 Article en page(s) : p. 489-495 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Chimie analytique
Cosmétiques
Extraction liquide-liquide
Extraction par micro-ondesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : OBJECTIF : Développement d'une nouvelle technique de microextraction liquide-liquide dispersive (MADLLME) assistée par micro-ondes selon la solidification d'une gouttelette organique en suspension (SFO) et de la spectrométrie d'absorption atomique à four graphite (GFAAS), utilisées pour l'extraction et la détermination des ions de plomb dans les rouges à lèvres et teintures capillaires fabriqués dans différents pays. Des échantillons de rouge à lèvres et la teinture des cheveux de différentes marques et couleurs ont été recueillies auprès du marché local à Kermanshah, Iran.
METHODES : Après traitement de l'échantillon par une digestion acide assistée par micro-ondes, un mélange approprié d'acétone, de 1-undécanol et de l'acide dithiophosphorique de diéthyle a été injecté rapidement dans l'échantillon aqueux contenant des ions de plomb et, en conséquence un mélange trouble a été formé. Après centrifugation, le tube à essai a été refroidi pendant quelques minutes. Le 1-undécanol solidifié au-dessus de la solution a été transférée dans un flacon convenable et injecté dans l'instrument d'analyse.
RESULTATS : Dans les conditions expérimentales optimales (extraction par solvant: 30 µL de 1-undécanol; dispersion solvant: 500 µL d'acétone, la concentration ligand: 0.15% (v/v); pH: ~1.5 et sans sel ajouté), un facteur d'amélioration de 96 a été obtenu. Les graphiques d'étalonnage étaient linéaires dans l'intervalle de 0.3 à 50 µg kg?1 avec un coefficient de corrélation (r2) de plus de 0.995. La limite de détection était de 0.1 µg kg?1. Par conséquent, la méthode développée a été appliquée avec succès pour extraire et déterminer des ions de plomb dans les rouges à lèvres et les colorants capillaires et des résultats favorables ont été obtenus. La méthode proposée qui se appliquait dans les cosmétiques a montré des recouvrements relatifs excellents (90–109.7%) avec de déviations standard relatives <8.3% (n = 3) pour tous les échantillons.
CONCLUSION : L'étude a révélé que la concentration de plomb trouvé dans les rouges à lèvres et les teintures capillaires sur le marché Kermanshah est bien inférieure aux limites recommandées, appliqué en Allemagne (20 mg kg?1) et le Canada (10 mg kg?1) et a confirmé que des niveaux très bas de plomb sont techniquement disponible dans les produits cosmétiques finis.DOI : 10.1111/ics.12221 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/ics.12221 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24641
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 37, N° 5 (10/2015) . - p. 489-495[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17464 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Transparency in compounding : Inline testing methods for monitoring processes Type de document : texte imprimé Auteurs : Pierre Pfeffer, Auteur ; Norbert Halmen, Auteur ; Thomas Hochrein, Auteur ; Giovanni Schober, Auteur Année de publication : 2021 Article en page(s) : p. 10-13 Langues : Anglais (eng) Catégories : Analyse spectrale
Assurance qualité
Contrôle non destructif
Matières plastiques
Mesures optiques
Micro-ondes
Procédés de fabrication
Térahertz
UltrasonsIndex. décimale : 668.4 Plastiques, vinyles Résumé : The quality of final products can be increased by using measurement technology for monitoring production processes. Interest in it is increasing especially for compounding. There are various existing methods of non-destructive testing that can also be used inline in the manufacturing process. The different methods are suitable for different applications: an overview of the current capabilities and limitations of the various inline methods. Note de contenu : - Ultrasonics : Proven, but temperature-dependent technology
- Optical spectroscopy : Regulating color directly in production
- Microwave and terahertz : Temperature-independent and non-contacting
- The appropriate method for the particular application
- Fig. 1 : An overview of electromagnetic and mechanical waves arranged in the order of frequency and wave length : The red colored areas represent the NDT methods used in plastics processing
- Fig. 2 : Dependence of measurable ultrasonic amplitude (extinction coefficients) of filler content and the accompanying median size of chalk particles in plastics compounds: By using such databank-integrated calibration curves, both of these quality relevant features can be quantified inline by ultrasound
- Fig. 3 : Process chain exemplified by color measurement of dyed plastics products: Dyed compounds are manufactured from various raw materials and processed further, either continuously by extrusion, or discontinuously to injection molded products. All along the process chain there are various possibilities for monitoring color quality
- Fig. 4 : Dependence of a characteristic value, the so-called refractive index determined via terahertz from the degree of melting in a compound or the melt temperature: The degree of melting can be recorded inline by consulting a databank specific to the material
- Fig. 5 : The dependence of so-called intensity, a characteristic value recorded via terahertz from the stochastic appearance of foreign materials in a compound (left), as well as a microscopic image of a machine-related wear particle in the melt (right): A threshold value (red line, left) can be defined by taking a variety of processing states into consideration beyond which the measuring signal can be univocally consigned to a foreign particleEn ligne : https://drive.google.com/file/d/14HvEX29bLDS3vrJDpT7bgV9MOWqmqJhZ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35712
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 10-13[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22682 - Périodique Bibliothèque principale Documentaires Disponible Using DMA and UV-Vis spectroscopy to predict the performance of wood coatings in outdoor use / F. Bulian in SURFACE COATINGS INTERNATIONAL, Vol. 94, N° 5 (10/2011)
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Titre : Using DMA and UV-Vis spectroscopy to predict the performance of wood coatings in outdoor use Type de document : texte imprimé Auteurs : F. Bulian, Auteur ; A. Matellon, Auteur ; A. Melchior, Auteur ; D. Menotti, Auteur ; M. Tolazzi, Auteur ; A. Spagna, Auteur ; M. Tanelli, Auteur Année de publication : 2011 Article en page(s) : p. 177-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique
Analyse spectrale
Applications extérieures
Bois -- Revêtements protecteurs
Durée de vie (Ingénierie)
Essais accélérés (technologie)
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are widely used in order to protect wood from degradation, in particular in outdoor applications. Wood degradation involves a number of complex reactions promoted by the interaction of wood with external factors such as oxygen, solar radiation, water, pollutants etc. Note de contenu : - Research directions and problems : The value of accelerated testing
- Experimental procedures : Materials and sample preparation - Weathering - DMA characterisation - UV-Vis spectroscopy
- Table 1 : Products and their durability
- Table 2 : Visco-elastic parameters before and after the weathering test
- Fig. 1 : Samples after one year of natural exposure : Standard trial EN-927-3 and trial with water trap
- Fig. 2 : Variation in Tg during weathering trial
- Fig. 3 : UV-Vis transmission spectra of coating samples at different stages in the weathering testEn ligne : https://drive.google.com/file/d/1npi8CzY-GjAbf2FUZ2Ew5XBO1QyUYZHo/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37318
in SURFACE COATINGS INTERNATIONAL > Vol. 94, N° 5 (10/2011) . - p. 177-180[article]UV damage to hair and the effect of antioxidants and metal chelators / Keith R. Millington in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 42, N° 2 (04/2020)
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Titre : UV damage to hair and the effect of antioxidants and metal chelators Type de document : texte imprimé Auteurs : Keith R. Millington, Auteur ; J. M. Marsh, Auteur Année de publication : 2020 Article en page(s) : p. 174-184 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Antioxydants
Chélates
Cheveux -- Effets du rayonnement ultraviolet
Fluorescence
Photodétérioration
Radicaux libres (chimie)Index. décimale : 668.5 Parfums et cosmétiques Résumé : - OBJECTIVE : To study the effects of addition of a redox metal, copper, antioxidants and metal chelators on the formation of free radicals in natural white Caucasian hair subsequently exposed to UV light. Three different methods, electron paramagnetic resonance (EPR), a fluorescent probe for hydroxyl radical formation (terephthalate) and free radical photoyellowing, were used. These methods utilized different UV sources and reaction conditions, and so can give insights into the different mechanisms of action occurring during UV oxidation of hair. In addition, this study demonstrates how antioxidants and chelators can be screened to determine whether they can protect hair from UV damage.
- RESULTS : The three methods gave somewhat different results, illustrating the importance of reaction conditions and wavelength on the photochemical mechanisms, and the efficacy of additives to influence these reactions. EPR results showed that N-acetylcysteine (NAC) pre-treatment eliminated the intensity of the signal because of sulphur and carbon free radicals in white hair both before and after exposure to UVB radiation. Doping the hair with copper ions had no effect on the intensity of the EPR signal under dry conditions. Terephthalate fluorescent probe data showed that under wet conditions, irradiation of white hair with UVA produced significant amounts of hydroxyl radicals. Pre-treatment of hair with NAC reduced the number of •OH radicals produced by natural white hair compared to an untreated control. In contrast to the EPR result, white hair doped with copper ions produced significantly higher levels of •OH radicals under wet conditions. It appears that the ability of copper ions to catalyse the photogeneration free radicals in hair is highly dependent on water content. Photoyellowing data showed a benefit for oxalic acid but no difference for NAC and an increase in yellowing for EDTA.
- CONCLUSION : The micro-EPR and terephthalate fluorescent probe methods are both effective techniques to study production of free radicals by hair exposed to UV light under wet and dry conditions, respectively. Both assays are simple methods for determining the effectiveness of potential protective hair treatments against UV damage, but because they assess free radical damage under dry vs wet conditions, the chemistry created on UV exposure is different. This gives insights into mechanism of action, but results may not be consistent between the two methods for actives added for reduction of UV damage. NAC pre-treatment did reduce free radical generation in UV-exposed hair under both wet and dry conditions. Photoyellowing data are more complicated as it is a less direct measure of UV damage and is highly dependent on irradiation source. Using UVB irradiation is experimentally convenient but may not be appropriate, because UVB wavelengths comprise only 0.3% of terrestrial sunlight. The photochemistry of hair exposed to sunlight involves concurrent photobleaching and photoyellowing processes and is far more complex. Under UVB irradiation conditions, oxalic acid showed a yellowing benefit.Note de contenu : - MATERIALS AND METHODS : Chemical treatments of hair tresses - EPR spectroscopy - Terephthalate fluorescence assay for hydroxyl (OH) radicals in UVA-exposed hair - Photoyellowing experiments - Colour measurement
- RESULTS AND DISCUSSION : EPR studies - Terephthalate fluorescence assay for hydroxyl (OH) radicals - Colour changes and photoyellowingDOI : https://doi.org/10.1111/ics.12601 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34508
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 42, N° 2 (04/2020) . - p. 174-184[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21862 - Périodique Bibliothèque principale Documentaires Disponible UV filter occurrence in beach water of the Mediterranean coast – A field survey over 2 years in Palavas-les-Flots, France / Delphine Thallinger in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° S1 (10/2023)
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Titre : UV filter occurrence in beach water of the Mediterranean coast – A field survey over 2 years in Palavas-les-Flots, France Type de document : texte imprimé Auteurs : Delphine Thallinger, Auteur ; Jérôme Labille, Auteur ; Thomas Milinkovitch, Auteur ; Jean-Luc Boudenne, Auteur ; Frédéric Loosli, Auteur ; Danielle Slomberg, Auteur ; Bernard Angeletti, Auteur ; Christel Lefrançois, Auteur Année de publication : 2023 Article en page(s) : p. 67-83 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Chimie analytique
Cosmétiques -- Aspect de l'environnement
cosmétiques -- Produits chimiques
Environnement -- Etudes d'impact
Evaluation du risque
Plages -- Pollution
Produits antisolaires
Tests de sécuritéIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : A 2-year sampling campaign was realized on French Mediterranean beach (Palavas-les-Flots Hérault) in order to measure the concentration of UV filters released from the sunscreen used by bathers. Multiple factors suspected of playing determining roles in the UV filter pattern in water were explored, such as the seasonal and daily time evolutions, or the vertical and horizontal distributions, and they were regarded through the UV filter characteristics.
- Methods : The beach was monitored during periods of high and low tourist attendance, typically before, during and after the summer peak. The beachgoers attendance was counted. Bathing water was sampled distinctly from the bulk column and from the top surface layer, testing different sampling tools. Sediments and mussels were also sampled and analysed as potential UV filter sinks. Three organic UV filters (octocrylene OCR, avobenzone BMDBM and octyl methoxycinnamate OMC) and one mineral (titanium dioxide TiO2) were studied here as representatives of the current cosmetic market.
- Results : Summer peak attendance on the beach was confirmed associated with peak levels of UV filter concentration in the bathing water, even more pronounced during a heat wave period. This relation was also observed at day scale with an afternoon peak, suggesting a rapid evolution of the UV filter pattern in water. Contrasted fates were measured between the four studied UV filters, that could be mainly explained by their respective characteristics, i.e. particulate or dissolved, hydrophilic or lipophilic, lifetime. Generally, this resulted in a concentration ranking TiO2 > OCR > OMC > BMDBM, ranging from 0.5 to 500 μg/L. The most lipophilic and recalcitrant OCR was found most vertically differentiated and over concentrated in the top surface layer of water. Finally, a large horizontal heterogeneity was also observed in the UV filter concentration pattern, raising the need for sample replicates that cover a significant area.
- Conclusion : This work fulfils some knowledge gaps on the issue of UV filter release in coastal environments, not only by providing original field data and methodological recommendations but also importantly in the comparison made of organic and mineral UV filters, which are often considered separately and rarely evaluated at the same time.Note de contenu : - MATERIALS AND METHODS : Study site: Palavas-les-Flots Beach - Sampling methods - Geographical recordings - Water analysis - Polypropylene sorbent sheet analysis - Sediment analysis - Mussel analysis
- RESULTS AND DISCUSSION : Time evolution of UV filters in water through 2020–2021 - Vertical distribution and persistence of the UV filters in the water column - Horizontal heterogeneities of UV filters in water - UV filter accumulation in sediments and mussels
- CONCLUDING REMARKS : Parameters shaping the UV filter pattern in seawater - Biological implications of UV filters in seawater
- Table 1 : Summary of sampling times, replicates and methods in 2020 and 2021
- Table 2 : Linear slope of the UV filter series in Figure 2 and characteristics of the different UV filters
- Table 3 : TiO2 concentrations found in sediments 2020–2021 and mussels 2020DOI : https://doi.org/10.1111/ics.12904 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/ics.12904 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40252
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° S1 (10/2023) . - p. 67-83[article]Vieillissement hétérogène d'un élastomères en ambiance nucléaire - Apport de l'analyse viscoélastique ponctuelle / Patrice Dole / 1995
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