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Superheated alcohols : lipids from plants / Tony Clifford in PERSONAL CARE EUROPE, Vol. 7, N° 5 (09/2014)
[article]
Titre : Superheated alcohols : lipids from plants Type de document : texte imprimé Auteurs : Tony Clifford, Auteur Année de publication : 2014 Article en page(s) : p. 26-27 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool
Extraction (chimie)
Extraits de plantes:Extraits (pharmacie)
IsopropanolL'isopropanol ou alcool isopropylique est le nom commun pour le propan-2-ol, composé chimique sans couleur et inflammable dont la formule chimique est CH3CH(OH)-CH3. C'est l'un des deux isomères du propanol (l'autre étant le propan-1-ol). Il est aussi connu sous son nom abrégé IPA (acronyme de l'anglais IsoPropyl Alcohol). Il est obtenu à partir de la réduction de l'acétone par le tétrahydruroborate de sodium.
Un autre procédé de fabrication consiste en une hydratation indirecte du propylène par l'acide sulfurique à 70 %, suivie d'une hydrolyse qui conduit à l'isopropanol.Index. décimale : 668.5 Parfums et cosmétiques Résumé : Superheated alcohols are liquid alcohols under pressure above their boiling points. They are much less polar than they are at room temperature. As a result they can extract lipid materials from biomass. This is often carried out by industrial organic solvents such as hexane. Instead the extraction can be carried out using benign solvents, both from the point of view of the environmental impact and solvent residues in the product. In addition novel compounds of interest can be obtained from a particular biomass. The motivation behind this development was to find environmental solvents, which can extract lipid materials from plant materials. We have experience using superheated water (lqiquid water under pressure above 100 °C) and wrote an article for Personal Care in February 2012. Molecular association by hydrogen bond increases the polarity of a solvent. This is particular the case in liquid water where there is an extensive intermolecular structure. When water is heated, this hydrogen-bond structure breaks up causing a reduction in polarity as measured by the dielectric constant strictly called nowadays the relative permeability. We will call it here by the older term: dielectric constant. The dielectric constant of water is 78 at room temperature and falls to 35 at 200°C. This enables it to dissolve organic molecules if they are slightly polar or polarizable. However, it will not dissolve completely non-polar molecules. We therefore decided to carry out research on superheated alcohols. Alcohols from dimers by hydrogen bonding and these break up at about 125 °C. The break-up of hydrogen bonding is also expected to cause the polarity of ethanol and other alcohols to fall in this temperature region. Thus we would expect some anomalous behaviour in the dielectric constant of alcohols in the region 100 °C to 150 °C. Note de contenu : - System for measurement of the dielectric constant
- Dielectric constant of ethanol
- Dielectric constant of isopropanol
- Laboratory and pilot-scale experimental studiesEn ligne : https://drive.google.com/file/d/1RSRM7KUpjv7gfMUACx4LP1JQhw9r68dR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22013
in PERSONAL CARE EUROPE > Vol. 7, N° 5 (09/2014) . - p. 26-27[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16487 - Périodique Bibliothèque principale Documentaires Disponible Superheated water : benefits to formulations / Tony Clifford in PERSONAL CARE EUROPE, Vol. 5, N° 1 (02/2012)
[article]
Titre : Superheated water : benefits to formulations Type de document : texte imprimé Auteurs : Tony Clifford, Auteur Année de publication : 2012 Article en page(s) : p. 67-69 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eau
Extraction (chimie)
Extraits de plantes:Extraits (pharmacie)Tags : 'Eau surchauffée' Polarité Extraction Solubilité 'Extraits plantes' Energie Index. décimale : 668.5 Parfums et cosmétiques Résumé : Superheated water is liquid water under pressure at above 100°C. It is much less polar than water at room temperature. As a result it can extract organic compounds. The lower polarity combined with the higher temperature means that extracts are more concentrated and can contain more active compounds. At the same time water is the most benign of extraction media, both from the environmental impact and solvent residues in the product. Note de contenu : - Fall in polarity and enhanced solubility
- Extraction
- Energy considerations
- Laboratory-scale experiments
- Production plants
- Further processingPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13398
in PERSONAL CARE EUROPE > Vol. 5, N° 1 (02/2012) . - p. 67-69[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13662 - Périodique Bibliothèque principale Documentaires Disponible Un survol des techniques de réaction et de séparation fluorées / Dennis P. Curran in L'ACTUALITE CHIMIQUE, N° 4-5 (04-05/2003)
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Titre : Un survol des techniques de réaction et de séparation fluorées Type de document : texte imprimé Auteurs : Dennis P. Curran, Auteur Année de publication : 2003 Article en page(s) : p. 67-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie organique
Extraction (chimie)
Fluor -- Composés -- Synthèse
Mitsunobu, Réaction de
Réactions chimiques organiques
Séparation (technologie)Tags : Phase fluorée Stratégie séparation Réactions biphasiques triphasiques Réaction Mitsunobu Index. décimale : 547.2 Synthèses et réactions classiques Résumé : Cet article présente une sélection diverse de techniques basées sur des composés fluorés récemment présentées, utilisables pour la synthèse et la séparation in situ. Les techniques de séparation incluent l'extraction liquide-liquide, l'extraction liquide-solide, de même que la chromatographie sur gel de silice fluorée. Les réactions monophasiques, biphasiques et triphasiques présentées ici utilisent des réactifs, des agents d’extraction et des groupes protecteurs fluorés dans un cadre de synthèse traditionnelle, de synthèse parallèle en solution ou encore de synthèse de mélanges. La facilité de la séparation et de la collecte des produits rendent les méthodes basées sur des molécules fluorées attrayantes pour la chimie à grande échelle, de même que leurs vitesses et leurs fiabilités représentent de grands avantages pour la chimie sur échelle réduite. En ligne : https://new.societechimiquedefrance.fr/numero/un-survol-des-techniques-de-reacti [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4613
in L'ACTUALITE CHIMIQUE > N° 4-5 (04-05/2003) . - p. 67-71[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 004142 - Périodique Bibliothèque principale Documentaires Disponible 004143 - Périodique Bibliothèque principale Documentaires Disponible Sustainability sourced pentylene glycol - a green all-rounder / Nadia Konaté in SOFW JOURNAL, Vol. 142, N° 10 (10/2016)
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Titre : Sustainability sourced pentylene glycol - a green all-rounder Type de document : texte imprimé Auteurs : Nadia Konaté, Auteur ; Markus Nahrwold, Auteur Année de publication : 2016 Article en page(s) : p. 44-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie en phase liquide à hautes performances
Extraction (chimie)
Peau -- Soins et hygiène
Pentylène glycolLe pentane-1,2-diol est un alcool de formule brute C5H12O2. C'est une molécule chirale car l'atome de carbone 2 portant un hydroxyle est asymétrique. Le pentane-1,2-diol se présente donc sous la forme de deux énantiomères : le R-pentane-1,2-diol et le S-pentane-1,2-diol.
solvantsIndex. décimale : 668.5 Parfums et cosmétiques Résumé : The increasing consumer demand for more natural cosmetics is a continuing global trend. The manufacturers of cosmetics and cosmetic ingredients therefore share a common goal : finding cost-effective bio-based ingredients that work as well as their petrochemical-derived counterparts. Recently, a nature-derived version of the popular synthetic alkanediol "pentylene glycol" has become available on an industrial scale at a competitive price (trade name: "Pentiol Green+", by Minasolve). It is produced on the basis of corn cabs and sugarcane bagasse and provides the same multi-functionality as its petrochemical equivalent : skin moisturization, emolliency and antimicrobial protection. However, the novel natural origin of pentylene glycol makes it possible to also use it in eco-labelled products. It increases the degree of naturality of cosmetics and reduces their carbon footprint. Furthermore, being an eco-sourced solvent, "green" pentylene glycol provides added value for extracting plant materials. Note de contenu : - Sustainable production
- Green multifunctionality
- Green preservation
- Green skin care properties
- Green extraction
- Safe for use
- FIGURES : 1. Production of "green" pentylene glycol from renewable starting material via "green chemistry" - Humectant properties of pentylene glycol (pentiol green+) and glycerin, measured by corneometry - Comparative usage and emollient properties of "green" pentylene glycol and two other "green" humectants - Qualitative and semi-quantitative HPLC + analysis (UV detection at 254 nm) of peppermint leaf extracts obtained by using "green" pentylene glycol (pentiol green+) and ethanol as extraction agents
- TABLES : 1. Challenge tests results according to ISO 11930 for "green" pentylene glycol (GPG) as standalone preservative and in various blends. The blue box highlights synergistic effects between GPS and phenypropanol - 2. O/W emulsion, subjected to challenge tests and sensory evaluation - 3. Sulphate-free shampoo, subjected to challenge testsPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27696
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Code-barres Cote Support Localisation Section Disponibilité 18378 - Périodique Bibliothèque principale Documentaires Disponible Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)
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Titre : Sustainable finished leather preservation : Part II - Wattle tannin capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants
Antibactériens
Caractérisation
Cuirs et peaux -- Conservation
Cuivre
Extraction (chimie)
Nanoparticules -- Synthèse
Produits de conservation du cuir
Tanins végétauxIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Part 1 of the current paper described the green synthesis of myrobalan capped copper nanoparticles for the preservation of the finished leather. In Part II of the current study, Copper Nanoparticles (CuNPs) were synthesized using green synthesis with wattle (tannin) extract as a reducing agent. Green synthesis is the preferred approach for the synthesis of metal nanoparticles due to its eco-friendly and cost-effectiveness for the preservation of finished leather. To improve the antibacterial qualities of leather with different types of finishes, the resin finished leather was coated with synthesized wattle copper nanoparticles (W-CuNPs). The chemical constituents of wattle induce the reduction of Cu2+ ions to CuNPs with the capping process and also remain as a stabilizing agent for the capping process. The formation of W-CuNPs was confirmed by UV-Spectroscopy at an absorbance of 467 nm. The identified functional groups such as -OH, C=C, and C-N were analyzed by Fourier transform infrared spectrum (FT-IR) which are responsible for the reduction and stabilization of copper nanoparticles. The spherical shape of the nanoparticles was ascertained by Scanning Electron Microscope (SEM), whereas Energy dispersive X-ray (EDX) studies confirmed the presence of copper with 65%. The average particle size of W-CuNPs was found to be 96 nm. The zeta potential value of -24 mv affirmed the stability of the W-CuNPs. The maximum zone of inhibition was 12 mm against Gram-positive (Bacillus subtilis) and 11 mm against Gram-negative (Serratia marcescens) bacteria on W-CuNPs coated finished leather, which exhibits strong antimicrobial activity. Hence, CuNPs synthesized by wattle extract have the potential to preserve the finished leather and its products as an antibacterial agent. Note de contenu : - MATERIALS AND METHODS : Preparation of tannin extraction - Synthesis of W-CuNPs - Characterization of W-CuNPs - Methodology of leather nanocoatings - Antibacterial assay of W-CuNPs and W-CuNPs coated leather - Effect of copper nanoparticles on growth of bacteria
- RESULTS AND DISCUSSION : UV-visible spectroscopy of w-CuNPs - Particle size distribution of W-CuNPs - Functional group analysis of W-CuNPs - Morphology and size of W-CuNPs - Antibacterial activity of W-CuNPs
- Table 1 : Antibacterial activity of the synthesized W-CuNPsDOI : https://doi.org/10.34314/jalca.v119i2.8323 En ligne : https://drive.google.com/file/d/1HvhiGDIyGSW4y29rKyK9k40TsJzHnT_O/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40466
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Code-barres Cote Support Localisation Section Disponibilité 24447 - Périodique Bibliothèque principale Documentaires Disponible Synthesis and evaluation of a novel shavings-based cationic flocculant / Dai Chunji in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 2 (03-04/2018)
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PermalinkPermalinkTextiles. Dosage du formaldéhyde / International Organization for Standardization (Genève, Suisse) / Geneve [Switzerland] : International Organization for Standardization (ISO) (1999)
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