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Preservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing / David G. Bailey in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)
[article]
Titre : Preservation of hides with sulfite. II. A matched side comparison of leathers from hides preserved with sodium sulfite or brine curing Type de document : texte imprimé Auteurs : David G. Bailey, Auteur ; William J. Hopkins, Auteur Année de publication : 1975 Article en page(s) : p. 372-379 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Comptage
Bain de saumure
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuir d'ameublement
Cuirs et peaux -- Conservation
Cuirs et peaux de bovins
Essais dynamiques
sulfite de sodium
Tige de la chaussureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A matched side experiment was carried out to corroborate small scale studies on the effectiveness of an acidified sulfite solution" as a short-term preservation system for fresh hides.
One side of each hide was conventionally sait cured and the other was treated with a 20 percent float containing 1.5 percent sodium sulfite and one percent acetic acid (on hide weight). Using six matched sides for each storage period, the sides were held six, 14, and 28 days at ambient temperatures. The leathers prepared from the preserved hides were tested for tensile strength, suitabilitv for lasting, and shrinkage temperature. The preservation was also monitored hy using microbial counts and noting the odor of the bides. The leathers made from sides held for all three storage periods were considered commercially acceptable. The results demonstrated that acidified sulfite provides an alternative to salt curing for the short-term preservation of hides. The new method reduces the dissolved solids in tannery effluents, an identified pollution problern caused hy the use of salt cured hides. In addition, the reduction of the microbial load in the preserved bides provides more sanitary conditions for hide handling.Note de contenu : - Table 1 : Microbial counts on preserved cowsides
- Table 2 : Physical test data on garment light shoe upper leather (from sides preserved for 6 days)
- Table 3 : Physical test data on upholstery leather in the crust (from sides preserved for 14 days)
- Table 4 : Physical test data on finished garment light shoe upper leather (from sides preserved for 28 days)
- Table 5 : Shrink temperatures of crust leathers (°C)En ligne : https://drive.google.com/file/d/181glFLUG0sckHdP3A7ygugRLm-fMB1k9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38790
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 372-379[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008509 - Périodique Archives Documentaires Exclu du prêt Pressure wet hydrogen peroxide oxidation of chromium sludge / S. Pinho in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 6 (11-12/2002)
[article]
Titre : Pressure wet hydrogen peroxide oxidation of chromium sludge Type de document : texte imprimé Auteurs : S. Pinho, Auteur ; M. F. Almeida, Auteur ; M. J. Ferreira, Auteur Année de publication : 2002 Article en page(s) : p. 257-262 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Boues résiduaires
Déchets -- Elimination
Essais (technologie)
Oxydation humide
Peroxyde d'hydrogèneLe peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales.
Sédimentation
Taguchi, Méthodes de (Contrôle de qualité)
Tannage -- DéchetsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : European tanneries generate a large amount of sludge containing chromium and other substances, some of which may be hazardous in post-tanning operations. In the next few years it is expected that landfilling these high organic content residues will be restricted in the EU thus imposing the need for treatment. This work assesses wet oxidation (WO) using hydrogen peroxide as an alternative solution for reducing the volume of sludge and its organic content. The effects of temperature, time, H2O2 dose and pH in the WO of a tannery sludge with chromium are evaluated through laboratory tests carried out in the range of 100-250 oC. Volume of sludge, total solids and volatile solids were determined in the experiments as well as total organic carbon and chromium on most of them. Note de contenu : - EXPERIMENTAL DETAILS : Sludge characteristics - Sedimentation tests - WO experiments - WO blank test - Design of experiments
- RESULTS AND DISCUSSION : Characteristics of chromium sludge - Sedimentation tests with chromium sludge - WO blank test - WO experiments - First set of WO experiments - Second and third sets of WO experiments - Selection of temperature, time and H2O2 offer
- Table 1 : Results of WO experiments following a 7 factors, 2 levels L8 Taguchi design
- Table 2 : Effects of the 7 factors on the performance of WO experiments
- Table 3 : Results of the 2nd set of WO experiments following a L4 Taguchi design with temperature, time, pH at the levels of 200/250 oC, 30/120, minutes, pH 1/4
- Table 4 : Effects of the 3 factors on the performance of WO experiments on Table III
- Table 5 : Results of the 3rd set of WO experiments following a L4 Taguchi design with temperature, time, pH at the levels of 200/240 oC, 30/120 minutes, pH 2/3
- Table 6 : Effects of the 3 factors on the performance of WO experiments on Table V
- Table 7 : Wet oxidation results of a pulp with 2% sludge, initial pH 4, for 15 and 240 minutes at 200oC with different doses of hydrogen peroxideEn ligne : https://drive.google.com/file/d/1Lt-W61c8zvLIKmiIYotE7bUGzFDiOkfM/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39846
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 86, N° 6 (11-12/2002) . - p. 257-262[article]Preventing enzymatic damage to hides by timely inhibition of trypsin activity with soybean flour during bating process / Tingyuan Chen in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 6 (06/2023)
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Titre : Preventing enzymatic damage to hides by timely inhibition of trypsin activity with soybean flour during bating process Type de document : texte imprimé Auteurs : Tingyuan Chen, Auteur ; Yunhang Zeng, Auteur ; Bi Shi, Auteur Année de publication : 2023 Article en page(s) : p. 245-252 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés physiques
Soja et constituants
TrypsineLa trypsine (EC 3.4.21.4) est une enzyme digestive du suc pancréatique qui a pour rôle de digérer les protéines.
Elle est synthétisée par le pancréas sous forme de trypsinogène (proenzyme inactive), puis stockée dans les vésicules enzymatiques des cellules acineuses d'où elle est excrétée au moment de la digestion. L'activation du trypsinogène en trypsine est le résultat de l'hydrolyse d'un propeptide sous l'action de l'entérokinase ou par un effet d'autoactivation de la trypsine par elle-même. La cholecystokinine-pancréozymine active la sécrétion des enzymes (donc de la trypsine) dans le suc pancréatique.
La trypsine est une endoprotéase qui hydrolyse les liaisons peptidiques dans lesquelles un acide aminé basique (Lys-|-Xaa ou Arg-|-Xaa) engage sa fonction acide (sauf dans le cas où l'acide aminé suivant (schématisé ici par "Xaa") est une Proline). Elle coupe en C-terminal de ces acides aminés. En d'autres mots, elle transforme les chaînes polypeptides en chaînes protéiques plus courtes pour permettre la digestion. Efficace à pH 7,5 - 8,5, elle est inactivée et digérée en quelques heures à pH neutre (=7) dans l'intestin.
La trypsine participe à l'activation d'autres enzymes comme l'alpha-chymotrypsine par coupure hydrolytique de la chaîne polypeptidique du chymotrypsinogène.
Cette enzyme sert également lors de la 2e semaine du développement embryonnaire humain. Elle est sécrétée par le trophoblaste afin de digérer la zone pellucide entourant le blastocyste. Ce phénomène s'appelle l'éclosion.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Enzymatic bating is important for producing clean, soft, and high-yield leather. However, it is prone to cause damage to hide collagen fibers and result in loose grain or damaged grain surface due to the longer enzymatic hydrolysis time of the grain layer than the middle layer caused by the slow mass transfer and the rapid hydrolysis reaction of the bating agent in hide. Considering trypsin is the most common bating agent, soybean flour (SF) that contains environmental friendly Kunitz trypsin inhibitor (KTI) was used after delimed hides were treated with trypsin for a certain time to opportunely inhibit its activity in the grain and avoid bating defects. The fluorescence micrographs of hides bated with fluorescently labelled trypsin and KTI showed that KTI could cover only the surface layers when it was added after bating for a certain time, whereas trypsin could penetrate the hide completely. When sufficient SF was added to the bating float at 2 h, the damage to hide collagen caused by trypsin was effectively reduced. In particular, the grain surface remained intact after bating for 8 h. The decrease in the strength of leather caused by bating was also reduced. In addition, the usage of SF scarcely affected the fiber dispersion of the middle layer, thereby ensuring the softness of leather. In summary, opportunely inhibiting the activity of trypsin in the grain could prevent hide damage and improve the quality of leather. Note de contenu : - EXPERIMENTAL : Materials - Assay trypsin activity in the presence of KTI and SF - Analyses of trypsin and KTI penetrations during bating - Bating trials by using trypsin and KTI/SF
- RESULTS AND DISCUSSION : effects of KTI and SF on trypsin activity - Penetrations of trypsin and KTI in hide - Effects of KTI and SF on hide damage - Effects of KTI and SF on fiber dispersion - Effect of SF on leather properties
- Table 1 : Physical properties of crust leathersDOI : https://doi.org/10.34314/jalca.v118i6.7659 En ligne : https://drive.google.com/file/d/1C6P69yzkEVTCYIpXAvhBNgfKD7OP8Gia/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39481
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 6 (06/2023) . - p. 245-252[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24080 - Périodique Bibliothèque principale Documentaires Disponible Prevention of bacterial damage on brine cured and fresh cattlehides / John W. Mitchell in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : Prevention of bacterial damage on brine cured and fresh cattlehides Type de document : texte imprimé Auteurs : John W. Mitchell, Auteur Année de publication : 1987 Article en page(s) : p. 372-382 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This study evaluates the effectiveness of the bacteristat 1,2-Benzisothiazolin-3-one (BIT) as a hide preservative. The study is unique in scope in that hide and leather conditions had been evaluated from the hair state through to the crust leather state as the exclusive determination of effectiveness of preservation, since the full extent of damage is often not discernable until hides are processed into crust leather where the grain quality and other properties can be truly evaluated. More than 1300 hides are involved.
The study demonstrates that brine cured hides held one year after treatment with BIT in the raceway are significantly superior in hide and leather quality to those from an untreated raceway. Also it demonstrates that fresh hides treated with BIT in combination with boric acid can be held successfully for twelve days. Finally, BIT was found to reduce fluid exudation which accompanies breakdown of cellular structure, resulting in shrinkage of hide weight.En ligne : https://drive.google.com/file/d/1oj1h8woXF1atHcGutk9iRNddsBDwL__d/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9120
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Code-barres Cote Support Localisation Section Disponibilité 008087 - Périodique Bibliothèque principale Documentaires Disponible Prevention of halophilic microbial damage on brine cured hide by extremely halophilic halocin producer strains / Meral Birbir in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 88, N° 3 (05-06/2004)
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Titre : Prevention of halophilic microbial damage on brine cured hide by extremely halophilic halocin producer strains Type de document : texte imprimé Auteurs : Meral Birbir, Auteur ; S. Erylmaz, Auteur ; Ayse Ogan, Auteur Année de publication : 2004 Article en page(s) : p. 99-104 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Bactéries halophiles
Cuirs et peaux -- Conservation
Halocines
Microbiologie
Peaux brutes -- SalageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tuz Lake and its salterns; Kayacik, Kaldirim and Tuzkoy Salt Mine in Central Anatolia are the major salt sources of Turkey. Crude salt extracted from these sources is commonly used in hide preservation. Proteolytic activity of extremely halophilic microorganisms, present in the salt used for hide preservation, can digest the grain surface of hides. Many bactericides have therefore, been used in the leather industry to prevent damage by halophiles.
However, natural proteinaceous antimicrobial substances such as halocins which are produced by halophilic archaea may be an effective and pollution free alternative to inhibit the proteolytic halophilic archaea in brine solutions. The above reason prompted us to conduct a microbial survey of the salt and brine samples collected from
different salt sources in Turkey. A total of 56 extremely halophilic strains were isolated from these salt sources. It was found that 67% of the Tuzkoy Salt Mine and Kaldirim Saltern strains had gelatinase activity. Kayacik Saltern had the highest number of gelatinase positive strains (71%), while the Tuz Lake had the lowest number of gelatinase positive strains (63%). Seven out of 19 Tuz Lake strains, 16 out of 18 Kaldirim Saltern strains, 2 out of 7 Kayacik Saltern strains and 10 out of 12 Tuzkoy Salt Mine strains produced halocins effective against each other. The most potent halocin producers were found in Kaldirim Saltern and the Tuzkoy Salt Mine.
All the cells of halocin producers were Gram negative, motile and most of them were pleomorphic. The susceptibilities to different antibiotics of the halocin producer strains were examined and antibiotic test results indicated that these strains were of the family Halobacteriaceae. Although many gelatinase negative halocin producers were isolated from different salt sources, the KYS1 strain was found to be the most effective strain in inhibiting all gelatinase positive strains of Kayacik Saltern and some of the other gelatinase positive strains which could not be inhibited by the Tuz Lake and Tuzkoy Salt Mine strains. It is suggested that gelatinase negative halocin producers or their halocin extracts may be used in preventing the halobacterial deterioration that can occur during brine curing of hides.Note de contenu : - MATERIALS AND METHOODS - ISOLATION OF HALOPHILIC MICROORGANISMS : Gelatinase activity - Halocin activity - Morphological, cultural and physiological characteristics - Antibiotic tests
- RESULTS : Microbiological analyses - Isolation of halophilic microorganisms - Gelatinase activity - Halocin Activity - Cell and colony morphology - Salt tolerance - Antibiotic tests
- Table 1 : Average number of colonies (per gm salt or ml brine) obtained from different sampling sites
- Table 2 : Screening of gelatinase and halocin activities of Tuz Lake strains against each other and KYS1 strains
- Table 3 : Screening of gelatinase and halocin activities of Kaldırım Saltern strains against each other and KYS1 strain
- Table 4 : Screening of gelatinase and halocin activities of Kayacik Saltern strains against each other
- Table 5 : Screening of gelatinase and halocin activities of Tuzkoy Salt Mine strains against each other and KYS1 strain
- Table 6 : Frequency of the morphological characteristics of 28 extremely halophilic halocin producers studied
- Table 7 : Susceptibility rates of the halocin producer strains to different antibioticsEn ligne : https://drive.google.com/file/d/1-JnbM3mZR_C5Q694HQuVebsBc0QBWPb5/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39635
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 88, N° 3 (05-06/2004) . - p. 99-104[article]Prévisions des propriétés de confort des cuirs imperméables, naturels et artificiels, par emploi du test "PA" simulant la chaussure / L. G. Hole in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVI (Année 1974)
PermalinkPermalinkPrimeAsia - footprinting leather / Sarah Swenson in LEATHER INTERNATIONAL, Vol. 214, N° 4819 (04/2012)
PermalinkLes principes de la fabrication du cuir / Henry R. Procter / Exibook (2021)
PermalinkPrinciples and processes of light leather manufacture / Paul I. Smith / Chicago : Hide and Leather Publishing Company (1942)
PermalinkProbiotics for sustainable leather / Juan-Carlos Castell in LEATHER INTERNATIONAL, Vol. 219, N° 4870 (05/2017)
PermalinkProblèmes de corrosion et de protection contre la corrosion dans l'industrie du cuir / R. Hagen in TECHNICUIR, N° 2 (02/1973)
PermalinkPermalinkProblems associated with finishing hydrophobic leather / Jerry Levy in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXX, N° 4 (04/1995)
PermalinkProblems caused by veininess / BLC Leather Technology Centre in LEATHER INTERNATIONAL, Vol. 214, N° 4825 (10/2012)
PermalinkPermalinkProcédé de pelanage rapide enzymatique in REVUE TECHNIQUE DES INDUSTRIES DU CUIR, Vol. LXVIII, N° 4 (04/1976)
PermalinkProcess chain traceability / BLC Leather Technology Centre in LEATHER INTERNATIONAL, Vol. 213, N° 4807 (03/2011)
PermalinkProcess simulation and cost estimation of treatment of chromium-containing leather waste / Luisa F. Cabeza in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 10 (12/1998)
PermalinkProcess technology for extraction of tanning extracts and starch from canaigre roots / A. Tejeda-Mansir in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), LXXXVII, N° 4 (04/1992)
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