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Analysis 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)
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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
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Code-barres Cote Support Localisation Section Disponibilité 006917 - Périodique Bibliothèque principale Documentaires Disponible Evaluation of the stability of organic acid-masked aluminum complexes by size exclusion chromatography / Tingyou Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 4 (04/1996)
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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
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Code-barres Cote Support Localisation Section Disponibilité 006943 - Périodique Bibliothèque principale Documentaires Disponible Investigation on the recycling of spent chrome liquor from the view point of chrome complex composition / Keizo Wada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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Titre : Investigation on the recycling of spent chrome liquor from the view point of chrome complex composition Type de document : texte imprimé Auteurs : Keizo Wada, Auteur ; Kunio Shirai, Auteur ; Tomoyoshi Kubo, Auteur Année de publication : 1981 Article en page(s) : p. 333-342 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : When spent chrome liquor is recycled to the tanning bath, it must be supplemented with additional chrome to bring its concentration uo to that required for tanning. After an increase of 20 to 70 percent from the level of the first-run spent liquor, the ions of sodium, sulfate, and magnesium in the spent liquor reach equilibrium in the first three or four runs of tanning. These findings agree with results previously reported. The authors have made it clear by cation exchange chromatography, paper electrophoresis, and gel filtration, that recycling the spent chrome liquor does not essentially affect its chrome complex composition. However, they conclude that the recycling of self-basifying chrome agent requires more careful control of the tanning process, because its chrome complex composition alters rapidly with time after dissolution and because the hide is highly selective in its sorption of the chrome during tanning. Note de contenu : - EXPERIMENTAL : Chrome tanning and recycling of spent chrome liquor - Anlayses of general composition of chrome liquor - Analyses of chrome complexes
- RESULTS AND DISCUSSION : Recycling of sulfite-reduced chrome liquor - Recycling of self-basifying chrome liquorPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17667
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXVI (Année 1981) . - p. 333-342[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008514 - Périodique Archives Documentaires Exclu du prêt Properties of collagens from pigskins of different ages / Keizo Wada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXV (Année 1980)
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Titre : Properties of collagens from pigskins of different ages Type de document : texte imprimé Auteurs : Keizo Wada, Auteur ; Kunio Shirai, Auteur ; Akira Kawamura, Auteur Année de publication : 1980 Article en page(s) : p. 90-99 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : When insoluble pigskin collagen was heated in a buffer solution at 60°C for one hour, about 60 percent of it was solubilized if the collagen was from 6-month-old skin, but only 20 percent if it was from 3-year-old skin. This indicates the strong effect of age. A similar effect was observed in the case of solubilization with 2 M CaCl2 at 20°C or 1 M urea at 45°C. When the two collagens where treated with pepsin, the influence of age on solubility almost disappeared and the amount solubilized increased to more than 80 percent for both. Disc electrophoresis of the digests indicated that they consisted mainly of alpha chains, although the content of components higher than beta was somewhat greater in the 3-year-old than in the 6-month-old collagen. The fraction of alpha 1 derivatives was separated into five peaks by CM-cellulose chromatography and disc electrophoresis. Note de contenu : - EXPERIMENTAL : Source of collagen - Treatment with pepsin - Acrylamide gel disc electrophoresis - CM-cellulose chromatography
- RESULTS AND DISCUSSION : Comparison of the solubilities of collagens - Influence of pepsin treatmentEn ligne : https://drive.google.com/file/d/1cgAYgiibtbt3ILpbLyg2-MJdoSU7FGPU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17729
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXV (Année 1980) . - p. 90-99[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008513 - Périodique Archives Documentaires Exclu du prêt Size-exclusion chromatography of organic acid-masked aluminum complexes and the determination of combined acid/aluminum ratio of the fractions / Tingyou Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXXI, N° 4 (04/1996)
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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
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Code-barres Cote Support Localisation Section Disponibilité 006943 - Périodique Bibliothèque principale Documentaires Disponible