Aller sur edunet
Accueil
Détail de l'auteur
Auteur Eisuke Takata |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la rechercheAnalysis of the composition of masked aluminium complexes by HPLC combined with capillary electrophoresis / Eisuke Takata in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 4 (04/1994)
Titre : Analysis of the composition of masked aluminium complexes by HPLC combined with capillary electrophoresis Type de document : texte imprimé Auteurs : Eisuke Takata, Auteur ; Yoshimichi Maeda, Auteur ; Yasuhiro Ishii, Auteur ; Kunio Shirai, Auteur Année de publication : 1994 Article en page(s) : p. 89-97 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Size-exclusion, high performance liquid chromatography (HPLC) combined with capillary electrophoresis was applied to analyze the composition of oxycarboxylate-masked aluminium complexes. Using a HPLC column (asahipak GS-220) connected to a refractive index detector, oxycarboxylate-masked aluminium complexes were separated into several peak fractions.Oxy-acid content of the fractions was successfully determined by capillary electrophoresis (shimadzu IP-2A). Glycolate- and lactate-masked aluminium complexes contained the major portion of the components to be eluted in the lower molecular size region while a considerable portion of tartrate- and citrate-masked complexes eluted in the higher molecular size region. All masked-aluminium fractions contained oxy-acids at an equivalent-to-mole of al ratio of 0.1 to 0.2. En ligne : https://drive.google.com/file/d/1v7GVZYDcPFjZMw_8r84MDrpAgTwkSg3l/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8081
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 4 (04/1994) . - p. 89-97[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006917 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Evaluation of the stability of organic acid-masked aluminum complexes by size exclusion chromatography Type de document : texte imprimé Auteurs : Tingyou Zhang, Auteur ; Eisuke Takata, Auteur ; Kunio Shirai, Auteur Année de publication : 1996 Article en page(s) : p. 95-99 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Citrate, tartrate, and acetate-masked basic aluminum chloride solutions were stored in the acidic medium (pH 2.3 to 4.2) and analyzed for the proportion of polynuclear fractions of complexes by size-exclusion chromatography (SEC). Polynuclear fractions in citrate or tartrate-masked samples decreased clearly with lowering pH and prolong storage as well as with dilution as judged by SEC. In contrast, the polynuclear fractionsin acetate-masked and unmasked basic aluminum chloride indicated a significantly high stability under the same conditions. It is explained in terms of the higher stability of olated complexes that constitute the polynuclear fractions of both samples. The proposed SEC method can serve to evalute the stability of polynuclear fractions of masked aluminum tanning agents in acidic medium. En ligne : https://drive.google.com/file/d/1RF5yr0--IEq8VXa04GTQvPX22J1YDSRx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7799
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 4 (04/1996) . - p. 95-99[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006943 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Size-exclusion chromatography of organic acid-masked aluminum complexes and the determination of combined acid/aluminum ratio of the fractions Type de document : texte imprimé Auteurs : Tingyou Zhang, Auteur ; Yasuhiro Ishii, Auteur ; Kunio Shirai, Auteur ; Yasumasa Chonan, Auteur ; Eisuke Takata, Auteur Année de publication : 1996 Article en page(s) : p. 89-94 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Four kinds of preparations of masked aluminum complexes were prepared by adding sodium citrate at 1:2, sodium tartrate at 1:2, sodium acetate at 1:4 and 3:1 equivalents to aluminum equivalent. The masked preparations were separated by size-exclusion chromatography and the fractions were analyzed for aluminum content by atomic absorption spectroscopy and for combined organic acid by ion chromatography. More than 50% of the added citrate or tartrate was taken up as an aluminum complexed component. A major proportion of polynuclear complex species combined the described acid at 0,2-0,6 equivalent ratio in the preparation. The effect of tartrate was so remarkable that it produced a considerable amount of enlarged molecular-sized complexes with tartrate content 0,6-0,8 in equivalent ratio on one hand and also produced a certain amount of small molecular-sized complexes with high tartrate contents increasing toward 1,0 in equivalent ratio on the other hand. Uptake of acetate by aluminum complex molecules was only 2,5% of the added acetate even at the addition at 3:1 equivalent ratio. However, such a high concentration of acetate broke down the size of aluminum complexes in the solution. En ligne : https://drive.google.com/file/d/1sb13MvLfeYz78roZ4HaFVvZVbHVv2eXe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7798
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXXI, N° 4 (04/1996) . - p. 89-94[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006943 - Périodique Bibliothèque principale Documentaires Disponible
