1-butyl-3-methylimidazolium acetate as an alternative solvent for type I collagen / Jie Liu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 6 (06/2014)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIX, N° 6 (06/2014) . - p. 189-196 Titre : 1-butyl-3-methylimidazolium acetate as an alternative solvent for type I collagen Type de document : texte imprimé Auteurs : Jie Liu, Auteur ; Zhou Xu, Auteur ; Chen Yi, Auteur ; Haojun Fan, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 189-196 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Collagène -- Solubilité Solvants -- Suppression ou remplacement Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Low solubility and undesirable denaturation in conventional solvents continue to represent a significant challenge for efficient extraction, accurate characterization and versatile processing of collagen. In the present study, a room temperature ionic liquid (IL), 1-butyl-3-methylimidazolium acetate ([BMIM]Ac), was synthesized, and then evaluated as an alternative solvent for type I collagen. Real-time polarizing optical microscope observation indicated complete disintegration of hierarchical structure of collagen aggregates as solubilized in [BMIM]Ac at 25°C. The solubility reached up to approximately 8.0 wt.% at 25°C, more than ten times higher than that in conventional dilute acetic acid. In comparison with dilute acetic acid and recently reported chloridion ILs, high solubility of collagen in [BMIM]Ac at room temperature was ascribed to loose binding between [BMIM]+ and acetate, as well as stronger proton-accepting ability of [BMIM]Ac, which enabled rupture of those intermolecular hydrogen bonds and ionic bonds that stabilized collagen aggregates. However, such bond-rupturing effect was found selective at room temperature. As demonstrated by Fourier transform infrared, circular dichroism, atomic force microscope, and ultrasensitive differential scanning calorimetry analysis, [BMIM]Ac did not destroy the special triple-helical structure of tropocollagen molecules that had been identified as being of importance for the functional and bioactive properties of collagen. According to these results, the discovery of [BMIM]Ac as an ideal solvent for collagen may open up new possibilities for the chemistry and engineering of collagen, which has long been established as a readily accessible and renewable resource with many unique properties. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of [BMIM]Ac - Dissolution of collagen in [BMIM]Ac - Polarizing optical microscope (POM) observation - FTIR analysis - CD measurement - AFM observation - DSC measurement - RESULTS AND DISCUSSION : Dissolution mechanism of collagen in [BMIM]Ac - Triple-helical structure of collagen regenerated from [BMIM]Ac En ligne : https://drive.google.com/file/d/1sm3cYDSvhjqbYBv8WJIDxo4nbF5k-kaO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21517 [article]

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Le 25e anniversaire du symposium des huiles essentielles / Françoise Basset in PARFUMS COSMETIQUES AROMES, N° 119 (11/94)

[article]  inPARFUMS COSMETIQUES AROMES > N° 119 (11/94) . - p. 66-70 Titre : Le 25e anniversaire du symposium des huiles essentielles Type de document : texte imprimé Auteurs : Françoise Basset, Auteur Année de publication : 1994 Article en page(s) : p. 66-70 Langues : Français (fre) Catégories : Chimie analytique Dioxyde de carbone Enantiomères Extraction (chimie) Fluides supercritiques Huiles essentielles Index. décimale : 668.5 Parfums et cosmétiques Résumé : Les végétaux, qui fournissent à la parfumerie, à la cosmétique, à l'industrie alimentaire et à la pharmacie, molécules odorantes et principes, font l'objet d'analyses extrêmement précises. En vingt-cinq ans, les techniques analytiques ont fait des progrès considérables, à l'ordre du jour de ce symposium qui s'est tenu à Grasse. Note de contenu : - De quelques molécules nouvelles - Rien... ou presque n'échappe plus à la curiosité des chercheurs - Composition des HE et environnement du végétal - L'extraction au CO2 supercritique - Techniques analytiques et séparation des énantiomères - Mesure du sillage parfumé par headspace de la peau Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19704 [article]

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Accurate and simple method for simultaneous determination of restricted ethylene glycol ethers and esters in leather by GC-MS / He-Wei Ma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 3 (05-06/2021)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 105, N° 3 (05-06/2021) . - p. 117-123 Titre : Accurate and simple method for simultaneous determination of restricted ethylene glycol ethers and esters in leather by GC-MS Type de document : texte imprimé Auteurs : He-Wei Ma, Auteur ; Luo Jian-Xun, Auteur Année de publication : 2021 Article en page(s) : p. 117-123 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie analytique Chromatographie en phase gazeuse Cuirs et peaux -- Analyse Esters Ethers Ethylène glycol Extraction (chimie) Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : An analytical approach was developed for the simultaneous determination of the eight ethylene glycol ethers (EGEs) and esters (EGEEs) prohibited by European Union (EU) REACH regulation in leather samples. The analytes were extracted using methanol with ultrasonic assistance within 30 minutes. The extracts were cleaned up by passing the extraction solution through a cartridge containing alumina-N frits, and the eluate was injected into GC-MS which was fitted with a 60m length capillary DB-WAX column. Excellent separation of the eight EGEs/EGEEs was achieved by the capillary column within 25 minutes. The clean-up with Alumina-N cartridge presented desired efficiency for removing the co-extractives in the extracts. The major advantages of this method are the simplicity and accuracy. Limitation of the detection, linear range, and reproducibility of the method were evaluated. Average recoveries in the range of 91.7%-102.5% (RSD, <6.1 0/0) with detection limits at 3.09.4mg/kg for the eight targets were obtained. Analytical results showed that ethylene glycol dimethyl ether (EGDME), ethylene glycol ethyl ether (EGEE), and diethylene glycol dimethyl ether (DEGDME), were found in 22% of 95 leather samples at the concentration range of 35-82mg/kg, 12-285mg/kg and 28-66mg/kg, respectively, while the other five EGEs/EGEEs were not detected. Note de contenu : - EXPERIMENTAL PROCEDURES : Chemicals - Apparatus - Preparation and storage of standards - Sampling - Sample extraction - Extract clean-up - Instrumental analysis - RESULTS AND DISCUSSION : Selection of capillary column - Sample preparation - Effects of extraction time and temperature - METHOD VALIDATION : Linearity - Limits of detection (LOD) and quantification (LOQ) - Reproducibility studies - Analysis of leather samples - Table 1 : EGEs and EGEEs used in the experiment : Name, abbreviation, CAS N°., boiling point and monitored ions (m/z) - Table 2 : Recoveries of eight EGEs/EGEEs by the three SPE cartridges - Table 3 : Recoveries in the spiked negative leather with different temperature and time - Table 4 : Effects of MgSO4 used in the extraction process on the test results - Table 5 : Calibration data, precision and detection limits for the selected compounds - Table 6 : Levels of the prohibited EGEs/EGEEs found in leather samples En ligne : https://drive.google.com/file/d/1N6bhRrkh3wBBN1EUu33c6Tv8ADpSMiXw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35831 [article]

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Adhésifs. Détermination du taux de cendres total et du taux de cendres sulfatées - Norme NF EN 1246 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1998)

Titre de série : Adhésifs Titre : Détermination du taux de cendres total et du taux de cendres sulfatées - Norme NF EN 1246 Type de document : texte imprimé Auteurs : Association Française de Normalisation (Paris) , Auteur Editeur : Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) Année de publication : 1998 Importance : 7 p. Format : 30 cm Catégories : Adhésifs -- Analyse Adhésifs -- Normes Analyse quantitative (chimie) Chimie analytique Dosage des cendres Index. décimale : 668.3 Adhésifs et produits semblables Résumé : Le présent document prescrit deux méthodes afin de déterminer le taux de cendres total et le taux de cendres sulfatées d'un adhésif synthétique ou naturel. Indice de classement : T 76-110 Classification ICS : 83.180 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20653

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Adhesive properties of an epoxy resin bonding agent modified with waste granite powder / Lukasz Kampa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 5 (09/2022)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1303-1316 Titre : Adhesive properties of an epoxy resin bonding agent modified with waste granite powder Type de document : texte imprimé Auteurs : Lukasz Kampa, Auteur ; Agnieszka Chowaniec, Auteur ; Aleksandra Krolicka, Auteur ; Lukasz Sadowski, Auteur Année de publication : 2022 Article en page(s) : p. 1303-1316 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie analytique Déchets industriels -- Recyclage Epoxydes Essais d'adhésion Granite Liaisons chimiques Liants Poudres Résistance à l'arrachement Revêtements de sols Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : The article presents the adhesive properties of a new binder based on epoxy resin with the addition of waste granite powder. The binder was modified with granite powder in amounts ranging from 10% to 60% in relation to the weight of the resin. Moreover, a coating was made without the addition of the granite powder in order to compare the obtained results. Previously obtained pull-off test results were also analyzed. The obtained results confirmed that the optimal material solution includes 10% or 20% of granite powder by weight. Additionally, chemical and microstructural analysis was also performed for both the reference sample and the sample modified with 20% of granite powder. The article also presents an explanation of the reasons for such an improvement of pull-off strength, which is based on careful analysis of the adhesive properties of the epoxy resin bonding agent modified with waste granite powder. Moreover, it explains how granite powder particles penetrate into the near-surface layer of the substrate, examines the porosity of the near-surface layer of the substrate using microstructural analysis, and presents the effect of adding waste granite powder to the epoxy resin bonding agent on the chemical properties of the near-surface layer of the substrate. Note de contenu : - MATERIALS AND METHODS : Concrete substrate - Granite powder - Epoxy resin bonding agent - Preparation of the samples - Pull-off strength test - SEM chemical and microstructural analysi - RESULTS : Pull-off strength of the epoxy resin bonding agent - Comparison of the obtained results with other known works - SEM chemical and microstructural analysis - Table 1 : The share of the individual sizes of the aggregate grains that were used to make the concrete substrate - Table 2 : The results of the chemical analysis of the granite powder used for the epoxy resin bonding agent - Table 3 : List of selected modified epoxy coatings DOI : https://doi.org/10.1007/s11998-022-00620-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00620-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38271 [article]

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Aérosols semi-volatils : de l'identification au prèlèvement / Danièle Jargot in HYGIENE & SECURITE DU TRAVAIL, N° 247 (04-05-06/2017)  

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Age-related hair denaturation related to protein carbonyls / Naoya Fuse in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 46, N° 3 (06/2024)  

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Agents de surface. Sels de sodium, techniques d'esters sulfuriques d'amido-alcools dérivés des acides gras. Méthode d'analyse - Norme NF T 73-011 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1959)

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Aliphatic anionic polyurethane microemulsion leather filling-retanning agent / Bao Lihong in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 2 (03-04/2007)  

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Alternative in vitro models used in the main safety tests of cosmetic products and new challenges / Edith Filaire in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 44, N° 6 (12/2022)  

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Amino acid analysis by low pressure ion chromatography with conductivity detection / Hong Dai in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 5 (09-10/2004)  

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An eco-friendly system for stabilization of retinol : A step towards attending performance with improved environmental respect / Huey Mei Wang Pamella in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 5 (10/2023)  

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An effective and harmless recycling technology for hazardous chrome-tanned leather wastes / Minghui Li in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)  

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An improved method for accurately determining total content of four fungicides (TCMTB, OIT, OPP and PCMC) / Xuan Lei in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 3 (03/2023)  

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An innovative nano-sorbent for selective solid-phase extraction and spectrophotometric determination of p-amino benzoic acid in cosmetic products / Hossein Abdolmohammad-Zadeh in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 36, N° 2 (04/2014)  

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An oil-soluble extract of Rubus idaeus cells enhances hydration and water homeostasis in skin cells / Annalisa Tito in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 37, N° 6 (12/2015)  

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An overview of chemical straightening of human hair : technical aspects, potential risks to hair fibre and health and legal issues / A. L. Miranda-Vilela in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 36, N° 1 (02/2014)  

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L'analyse calorimétrique différentielle (DSC). Application à la chimie / Pierre Claudy in L'ACTUALITE CHIMIQUE, N° 3 (03/1999)  

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L'analyse en chimie environnementale / Sandrine Irace-Guigand in L'ACTUALITE CHIMIQUE, N° 277-278 (08-09/2004)  

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Analyse chimique des aciers et des fontes. Dosage spectrophotométrique du manganèse - Norme NF A 06-303 / Association Française de Normalisation (Paris) / Saint-Denis La Plaine : Association Française de Normalisation (AFNOR) (1962)

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