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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Studies on collagen structure using X-ray scattering on a closed-loop leather process / Yi Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)
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Titre : Studies on collagen structure using X-ray scattering on a closed-loop leather process Type de document : texte imprimé Auteurs : Yi Zhang, Auteur ; Jenna Buchanan, Auteur ; Jiasheng Su, Auteur ; Zhuangdou Zhang, Auteur ; Geoff Holmes, Auteur ; Sujay Prabakar, Auteur Année de publication : 2020 Article en page(s) : p. 373-379 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène -- Analyse
Cuirs et peaux -- Déchets -- Recyclage
Diffractométrie de rayons X
Diffusion aux petits anglesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Waste management in leather processing is crucial in limiting the excess use of hazardous materials that lead to environmental pollution and health concerns. A closed-loop approach was developed to recycle the spent solutions from leather processing to reduce waste in the effluent. The structural changes of collagen that accompany such processing are yet to be studied and is crucial in understanding the closed-loop process and its subsequent leather properties. In this study, we analysed the collagen structure at different processing stages across the closed-loop approach using synchrotron small-angle X-ray scattering. An increased filling effect in the collagen matrix was observed and attributed to the residual organic component and chromium species in recycled spent solutions. A high uptake of chromium was also observed from the increased scattering intensity from leathers treated with recycled chrome solution, indicating its efficient use. Additionally, the changes in scattering intensity from keratin and lipids indicated an effective unhairing process. Such findings on collagen structure changes will support the development of more environmentally and economically sustainable processing methods to benefit the leather industry. Note de contenu : - Sample preparation
- Small-angle X-ray scattering (SAXS)DOI : https://doi.org/10.34314/jalca.v115i10.4175 En ligne : https://drive.google.com/file/d/1B-AuPs8xRaBRWnOHDBZ7bKgDVRzJMpeE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34612
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 10 (10/2020) . - p. 373-379[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22361 - Périodique Bibliothèque principale Documentaires Disponible Studies on enzymatic dehairing : Part III. Enzymatic depilation of pigskins modified by alkalisation / Barbara Felicjaniak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)
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Titre : Studies on enzymatic dehairing : Part III. Enzymatic depilation of pigskins modified by alkalisation Type de document : texte imprimé Auteurs : Barbara Felicjaniak, Auteur Année de publication : 1986 Article en page(s) : p. 14-17 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The pancreatic enzymes and the bacterial enzymatic preparation, proteopol BP, are characterized by their vigorous activity against the grain of pigskins in the depilation process. The tests described in parts I and II of this work showed that there is possibility of limiting grain destruction through alkaline preparation of the skin substrate. The effectiveness of the method developed required industrial checking which, with complementary testings of the enzymatic process, is the subject of the present part of the work. En ligne : https://drive.google.com/file/d/1Aa8IoxOOmg9iHQTq7A9S-v1P2TWldcYQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9193
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 70 (Année 1986) . - p. 14-17[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007133 - Périodique Bibliothèque principale Documentaires Disponible Studies on enzymatic dehairing : Part IV. Methods of preparing calfskins for enzymatic depilation / Barbara Felicjaniak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 70 (Année 1986)
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Titre : Studies on enzymatic dehairing : Part IV. Methods of preparing calfskins for enzymatic depilation Type de document : texte imprimé Auteurs : Barbara Felicjaniak, Auteur Année de publication : 1986 Article en page(s) : p. 17-18 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Quantitative differences in the composition and structure of animal skin are significant. Even collagen, considered to be its most consistent component, shows characteristic chemical differences. Therefore, it is necessary to check the usefulness of the tanning methods for one type of skin before using them for others.
The purpose of the work discussed below was to check whether the method for enzymatic dehairing, elaborated and successfully used for pigskins on a commercial scale, may be used also for other kinds of skins. Calfskins were chosen as a subject to compare.
Calfskins from animals about one month old were sujbected to testing. The tests had a practical aspect in respect of environmental protection and the reclamation of hair which is valuable for felt production.En ligne : https://drive.google.com/file/d/1WUi-QHgL37qim9fF0lBbk48IJ8oHil5u/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9194
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 70 (Année 1986) . - p. 17-18[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007133 - Périodique Bibliothèque principale Documentaires Disponible Studies on enzymatic unhairing : Part I. The influence of pigskin alkalisation on destruction of skin grain during depilation with pancreatic enzymes / Barbara Felicjaniak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)
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Titre : Studies on enzymatic unhairing : Part I. The influence of pigskin alkalisation on destruction of skin grain during depilation with pancreatic enzymes Type de document : texte imprimé Auteurs : Barbara Felicjaniak, Auteur Année de publication : 1985 Article en page(s) : p. 160-163 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The enzymatic depilation of pigskins is a dangerous stage ofleather production due to hydrolysis of grain and deeper layers of ermis The extent of this destruction depends on the activity of the enzymes being used for depilation and on the quality of cured skins. Through adequate modification of a skin substrate, e.g. by increasing the resistance of grain microstructures to enzymatic proteolysis, the grain hydrolysis may be counteracted. This topic has long been discussed and one of the methods discussed is an alkaline swelling of skins by means of liming. Comparative tests produced a better quality of skins when depilated with pancreatic enzymes after pre-liming than when depilated without pre-liming. The liming was introduced into enzymatic depilation as a preparatory phase. The influence of alkali swelling (liming) has not been fully evaluated. In Heidemann's work, it was found that alkali swelling of skins intensifies the destruction of collagen by trypsin and influences the increase of damage to grain being affected by bacteria during the skin-curing process.
This negative opinion on pre-liming does not confirm our ealier histochemical examinations. The results of these examinations enabledus to find the higher resistance to proetolysis of grain microstructures of skins pre-limed than of skins depilated with pancreas enzymes without pre-liming. The reduction and even elimination of skingrain enzymatic destruction by means of skin pre-liming could not beutilised in practice due to a simultaneous immunization of bristles. Changes in the physico-chemical properties of keratin during liming made bristles insoluble in sodium sulphide. This rendered impossible a chemical removal of residual bristles, left on skins depilated by enzymes.
On the basis of earliler experiments, it seemed advisable to develop a milder method of alkalisation, which would give the optimum quality bristles and of skins depilated by enzymes. This is the subject of the present series of trials.Note de contenu : - Characteristics of pancreatic preparation.
- Methods of preparation of pigskins for scanning electron microscope (SEM) examinations.En ligne : https://drive.google.com/file/d/17I0hyAMEypGrZo1pwKN2I5tTpLopG45l/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9414
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 69 (Année 1985) . - p. 160-163[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007132 - Périodique Bibliothèque principale Documentaires Disponible Studies on enzymatic unhairing : Part II. The influence of alkalisation on the destruction of the grain of pigskins depilated with a bacterial enzymatic preparation / Barbara Felicjaniak in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)
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Titre : Studies on enzymatic unhairing : Part II. The influence of alkalisation on the destruction of the grain of pigskins depilated with a bacterial enzymatic preparation Type de document : texte imprimé Auteurs : Barbara Felicjaniak, Auteur Année de publication : 1985 Article en page(s) : p. 164-165 Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The vigorous action of pancreatic hydrolases against surface microstructures (the grain) of pig dermis was demonstrated in the first part of tests. The mechanism of the alkalising action has not been identified and, therefore, the application of the method to enzymes with another specificity than that of the pancreatic one required an additional check.
In the present work, the effectiveness of alkalisation was evaluated in application to the Polish commercial preparation of bacterial origin, Proteopol BP. The use of the commercial preparation in the tests resulted from an assumed objective, which was the development of an industrial method for skin depilation. The studies on eluted and purified enzymes were not the subject of the present work.Note de contenu : - Characteristics of the enzymatic preparation, proteopol BP.
- Preparation of pigskins and specimens for SEM examinations.
- Results.En ligne : https://drive.google.com/file/d/1BAdvxWhloEQIlqBhqtui3tkv6CaVrK09/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9419
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 69 (Année 1985) . - p. 164-165[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007132 - Périodique Bibliothèque principale Documentaires Disponible Studies on ethiopian sheep skins as an opportunity for value addition part I : histological, microscopic and chemical characterization of abyssinian and wanke sheepskins / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 3 (03/2014)
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PermalinkStudies on incineration of chrome leather waste / Tetsuo Imai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVI, N° 8 (08/1991)
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PermalinkStudies on mono and divalent cations effects on hair immunization / Domenico Castiello in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 11 (11/2007)
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PermalinkStudies on multicomponent spectroscopic analysis of dye solution / Marja Marjoniemi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), LXXXVII, N° 7 (07/1992)
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PermalinkStudies on pesticides used for the protection of skins during storage and transportation. Part 1 / P. Golob in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 3 (05-06/1992)
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PermalinkStudies on selective defect identification of crust leathers for computer-aided grading / S. Nithiyanantha Vasagam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 6 (06/2013)
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PermalinkStudies on semi-metal tanning / Anthony D. Covington in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 12 (12/2004)
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PermalinkStudies on shoe climate contributing to comfort / Y. Nayudamma in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 54, N° 6 (06/1970)
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PermalinkStudies on solubilized sulfur dyes for coloring leather / R. Venba in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 6 (06/2015)
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PermalinkStudies on the chemistry of syntans - Part II : chemistry of mixed condensation products / W. Madhu Latha in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 69 (Année 1985)
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PermalinkStudies on the correlation between surface and sewability properties of crust leather / C. Niklesh in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 5 (05/2023)
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PermalinkStudies on the defects and the economic losses on crust leather resulting from physical damage / K. E. E. Ibrahim in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)
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PermalinkStudies on the development of leathers from formaldehyde-free melamine syntan / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 5 (05/2012)
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PermalinkStudies on the development of a multi-functional syntan / R. Nataraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 7 (07/2009)
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PermalinkStudies on the effect of polyurethane finishing on the physico-mechanical properties of leather / Rajesh Kumar in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. N° 71 (Année 1987)
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