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675 : Technologie du cuir et de la fourrure |
Ouvrages de la bibliothèque en indexation 675
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Characterization of predominant bacteria in cattlehides and their control by a bacteriocin based preservative in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 10 (10/1995)
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Titre : Characterization of predominant bacteria in cattlehides and their control by a bacteriocin based preservative Type de document : texte imprimé Année de publication : 1995 Article en page(s) : p. 308-320 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens
Bactéries -- Identification
Caractérisation
Cuirs et peaux -- Conservation
Cuirs et peaux de bovinsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The objective of this study is to develop an ecologically acceptable and effective means of preserving cattle hides between the time of their removal from the carcass and tanning. The effectiveness of two bacteriocins (small antibacterial peptides) from lactic acid bacteria with and without SDS was studied. The initial bacterial population of the hides following removal is predominantly gram-positive cocci and rods that are sensitive to a mixture of the two bacteriocins, nisin and pediocin AcH. Following storage of the hides at 25°C for 2d, the bacterial profile changed, with the majority being gram-negative motile rods, especially Proteus species, that were not sensitive to the bacteriocins. Supplementation of the bacteriocin mixture with sodium dodecyl sulfate (SDS 0.25%) reduced the growth of the gram-negative rods. The importance of either treating a hide immediately after removal with a suitable preservative or keeping the hides for a short time below 10°C prior to applying a preservative or keeping the hides for a short time below 10°C prior to applying a preservative is discussed. If a shift in the bacterial population occurs with gram-negative motile rods predominating, bacteriocins will need to be supplemented with other components. As these gram-negative rods are extremely proteolytic, once present the proteolytic enzymes they produce may degrade the hide quality even if a suitable preservative is used later to prevent further growth. Note de contenu : - MATERIALS AND METHODS : Isolation of bacteria from hides - Biochemical and growth characteristics - Preparation of nisin and pediocin AcH - Influence of incubation temperature on growth rate - Viability loss of the isolates by bacteriocins - Growth in bacteriocin - Influence of supplementing bacteriocin mixture with SDS on growth - Influence of a mixture of bacteriocin and SDS on growth of 12 isolates at 25°C
- RESULTS AND DISCUSSION : Bacterial isolates from the hides and their characteristics - Growth of the isolates at different temperatures - Bacteriocin sensitivity of the isolates - Effectiveness of a combination of bacteriocin and SDS on growth of the isolatesEn ligne : https://drive.google.com/file/d/1mp02zQ3AgDEqUsmecat--y38gsVyXgw4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17837
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXX, N° 10 (10/1995) . - p. 308-320[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006936 - Périodique Bibliothèque principale Documentaires Disponible Characterization of the predominant bacteria associated with sheep and goat skin / N. Kayalvizhi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 6 (06/2008)
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Titre : Characterization of the predominant bacteria associated with sheep and goat skin Type de document : texte imprimé Auteurs : N. Kayalvizhi, Auteur ; T. Anthony, Auteur ; P. Gunasekaran, Auteur Année de publication : 2008 Article en page(s) : p. 182 - 187 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Skins and hides from livestock are the raw materials for the leather industry. Collagen is the major protein present in the skins and hides in association with various globular proteins, viz. albumin, globulin, mucoids; and fibrous proteins such as elastin, keratin, and reticulin. The hide or skin, once flayed, has cells that are deprived of supply of oxygen and nutrients. Hides and skin are getting damaged mainly by bacteria, which are responsible for the decomposition of untanned proteins (in raw hides and during soaking), while fungi thrive on leathers containing carbohydrates, fats and proteins. We have characterized the bacteria present in skin samples and found that the bacterial strains with proteolytic and lipolytic activities were predominant. Based on the biochemical-physiological characteristics, they were identified as Gram-positive rods and cocci such as Bacillus subtilis, B. megaterium, and B. cereus and Staphylocorcus epidermidis, and S. aureus and Lactobacillus acidophilus and L. fermentum. In addition, nine strains of Micrococcus luteus and one strain as Streptococcus feacalis were also identified. Total of sixteen Gram-negative bacterial strains, 3 were identified as Neisseria, 7 as Proteus sp., and 6 as Pseudomonas sp. Qualitative assessment of the degradation of collagen fibers leading to skin damage suggested that Gram-positive organisms with proteolytic activity are mainly involved in the putrefaction of goat/ sheep skin. En ligne : https://drive.google.com/file/d/15kekjliMOu92rIo-kNvBVEaMFVw4Mnaq/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2561
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 6 (06/2008) . - p. 182 - 187[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010401 - Périodique Bibliothèque principale Documentaires Disponible Characterization of the volatile organic compounds by HS-SPME-CG-MS in the leather sector / Rosa M. Cuadros in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 11 (11/2013)
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Titre : Characterization of the volatile organic compounds by HS-SPME-CG-MS in the leather sector Type de document : texte imprimé Auteurs : Rosa M. Cuadros, Auteur ; Agusti Marsal, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur ; Joaquim Font, Auteur Année de publication : 2013 Article en page(s) : p. 420-427 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Chromatographie en phase gazeuse
Cuir
Extraction en phase solide
Réduction des composés organiques volatils
Spectrométrie de masseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Current European legislation demands a reduction in the amount of volatile organic compounds (VOCs) used in industrial processes. The presence of these compounds in the leather industry arises from the chemicals used in the various stages of the leather manufacturing process. An important aim of tanners is to reduce or eliminate VOCs, without lowering the quality of their leather products. The HS-SPME-GC-MS method is an innovation in leather analysis. The solid phase micro extraction (SPME) is a sample preparation technique used for the extraction of volatile and semi-volatile organic compounds and is becoming widely accepted as the technique of choice for many applications and that can be connected to gas chromatography. The main advantages of this technique are speed, sensitivity, and the fact that it requires no sample handling or solvent extraction. Other advantages include the fact that the concentration and the extraction are reached simultaneously and that it enables on-site extraction of the analyte, even without the prior destruction of the sample. This paper shows the development of a new HS-SPME-GC-MS method with a deuterated internal standard for the detection and identification of volatile organic compounds emitted by leather. This method enables us to carry out a simple and rapid determination of the qualitative and semi-quantitative composition of the organic compounds in the samples. Note de contenu : - OBJECTIVE
- EXPERIMENTAL : Materials - Instrumentation - Samples - Procedure
- RESULTS AND DISCUSSION : Selection of the fiber - Limits of detection - Deuterated internal standard - Linearity - Recovery and precision - Analysis of commercial samples
- Table I : Values of ?area of the chromatograms of the four studied fibers
- Table II : Limite of detection and relative standard deviation (RSD) of VOCs
- Table III : Linearity and correlation coefficient of the four studied chemicals
- Table IV : Chemicals detected in commercial samplesEn ligne : https://drive.google.com/file/d/1Fozb01-dQmmasakLc3zDaDEzGjcQjh-f/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19690
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVIII, N° 11 (11/2013) . - p. 420-427[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15707 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Charge and fixation : Back to Basics : A framework for leather manufacture Type de document : texte imprimé Auteurs : Richard Daniels, Auteur ; Walter Landmann, Auteur Année de publication : 2005 Article en page(s) : p. 21 Langues : Anglais (eng) Catégories : Agents de tannage
Chrome
Collagène
Complexes métalliques
Fixation (chimie)
Glutaraldéhyde
Liaisons hydrogène
Prétannage
Réticulation (polymérisation)
Tanins végétauxIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The rate of fixation between the collagen structure and pretanning agents, dyes and many polymeric resins and fatliquors is determined by the charge of the collagen and the charges of the product.
An increase in alkalinity causes an increase in negative charge within the skin, due to lesses of amino(+) groups. Under these conditions, if a chemical with a strong positive charge is offered-such as chrome or aluminium salts-there is a very rapid reaction with the surface carboxyl(-) groups and no penetration. Under the same conditions, a product with a negative charge-such as a syntan-will combine slowly and penetrate deep into the structure as there is a reduced number of available amino(+) groups for fixation.Note de contenu : - Panel E4/1 : Charges relating to groups and products
- Panel E4/2 : Crosslinking by chromocomplexes: shift to cationic behavior
- Panel E4/3 : Crosslinking by glutaraldehyde : shift to anionic behavior
- Panel E4/4 : Hydrogen bonding by vegetable or synthetic tannins : shift to anionic behaviorEn ligne : https://drive.google.com/file/d/16QA5aGRIIVKhSzjDgZd78zp5ZsG158Nb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32375
in WORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 21[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006184 - Périodique Bibliothèque principale Documentaires Disponible Chemical and physical behaviour of collagen fibre in alkaline solutions / Cheng Haiming in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 4 (07-08/2009)
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Titre : Chemical and physical behaviour of collagen fibre in alkaline solutions Type de document : texte imprimé Auteurs : Cheng Haiming, Auteur ; Chen Min, Auteur ; Liao Longli, Auteur ; Li Zhiqiang, Auteur Année de publication : 2009 Article en page(s) : p. 140-144 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The chemical and physical behaviour of skin collagen fibre was studied in alkali solutions. After treatment with sodium hydroxide and calcium hydroxide solutions, the characteristic D-period of collagen fibril could not be seen by TEM. The fibril diameter increased by swelling in alkali solutions. The swelling occured both inter and intra fibrils. The hydrolysate of collagen in alkali solution was seen as a flat structure which illustrated that the hydrolysate was denatured in alkaline solutions. When collagen fibre was treated in alkali solutions for long periods, the isoelectric points of collagen hydrolysate were between 4.5 and 5.0. The higher the concentration of alkali solution, the lower the isoelectric point of the hydrolysate. During alkali treatments, the isoelectric point shifted to lower pH and, after 48 hour treatment, the isoelectric point reached equilibrium and did not change further. The triple helix conformation of collagen was destroyed when collagen was hydrolyzed in solutions of alkali according to the CD spectrum. SDS-PAGE electrophoresis results showed that hydrolysate of collagen in alkali solutions presented as a continuous band, no characteristic band of collagen appeared. The hydrolysis of collagen fibre in alkali solution not only happened at inter-molecular points, but also happened at peptide bonds of collagen molecule which was randomly hydrolysed. En ligne : https://drive.google.com/file/d/1wN1LUpoQIOjokJ_ZwLuSO0nBS6-Xo94i/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6103
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 4 (07-08/2009) . - p. 140-144[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011502 - Périodique Bibliothèque principale Documentaires Disponible Chemical and physical interactions involved in leather dyeing / D. Muralidharan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 81, N° 1 (01-02/1997)
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PermalinkPermalinkChemical fixation of hazardous wastes / M. W. Duncan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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PermalinkChemical modification of collagen hydrolyzates / Mircea Dan Bucevschi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIV, N° 3 (04-05/1999)
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PermalinkChemical modification of protein products isolated from chromium-containing solid tannery waste and resultant influence on physical and functional properties / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LCIV, N° 5 (07/1999)
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PermalinkPermalinkChemically modified castor oil for softening of leather - A novel approach / Bindia Sahu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 4 (04/2021)
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PermalinkPermalinkPermalinkChinese understanding of the ecological environment values of the leather industry / Han Wang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 105, N° 1 (01-02/2021)
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PermalinkChitosan based antibacterial composite materials for leather industry : a review / Linlin Yuan in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)
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PermalinkChitosan in leather production. Part 1 / Stephen M. Burkinshaw in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 75 (Année 1991)
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PermalinkChitosan in leather production. Part 2 / Stephen M. Burkinshaw in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)
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PermalinkChitosan in leather production. Part 6 / Stephen M. Burkinshaw in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 1 (01-02/1993)
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PermalinkPermalinkPermalinkChrome-melamine syntan : a step towards developing fuller leather / P. Balasubramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 10 (10/2015)
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