Low-salt antiseptic curing studies / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 64, N° 1 (01-02/1980)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 64, N° 1 (01-02/1980) . - p. 1-8 Titre : Low-salt antiseptic curing studies Type de document : texte imprimé Auteurs : A. E. Russel, Auteur ; A. C. Galloway, Auteur Année de publication : 1980 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiseptiques Chlorure de sodium Le chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin. On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na). Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène. Coût Cuirs et peaux -- Conservation Cuirs et peaux -- Industrie -- Aspect de l'environnement Industrie -- Pollution -- Lutte contre Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Strategies adopted to counter pollution problems confronting the leather industy may be categorised generally under three headings. Note de contenu : - Salt component in curing - Role of salt in curing - Water activity and bacterial growth - A. Laboratory studies on hide cutting - Small-scale field trials - Further field trials - Salt components in proposed low-salt cure - Salt utilisation in curing at various levels of salt offered - Costing of low-salt-antiseptic preservation - Table 1 : Pollution control-the three R's - Table 2 : Salt components in curing - Table 3 : Relation between the concentration - Table 4 : Limiting water activities for growth of some bacteria - Table 5 : Effect of salt concentration and soluble protein on bacterial count at 20°C - Table 6 : Maximum stable storage periods (in days) observed for green hide cuttings dip-treated in antiseptic salt solutions followed by moist storage in polythene envelopes at 26°C - Table 7 : Ash and moisture analysis on treated green hide pieces after 20h dip treatment in various antiseptic salt solutions - Table 8 : Ratio of treated, drained weight to green weight of hide cuttings in various antiseptic-salot treatments - Table 9 : Field trials on hide preservation using antiseptic-salt mixtures - Table 10 : Field trials on hide preservation using antiseptic-salt-mixtures - Table 11 : Periods of stable storage of hide cuttings from trial 3 treatments based on hair-slip and staling in moist incubation at 26°C - Table 12 : Salt components in proposed low-salt cure - Table 13 : Salt utilisation in curing at various levels of salt offered En ligne : https://drive.google.com/file/d/10hugwZZ6lPg8UQ983_BfBMyoA9C_kWTd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34131 [article]

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Salt-pH effects on collagen thermal stability in pickling and curing / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 6-13 Titre : Salt-pH effects on collagen thermal stability in pickling and curing Type de document : texte imprimé Auteurs : A. E. Russel, Auteur Année de publication : 1975 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Collagène Halogénures pH Stabilité thermique Sulfates Le sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-. Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effects of alkali halides and sulphates on thermal stability of insoluble and precipitated fibrous collagens have been examined in the acid-to-neutral pH range. The salt-pH levels studied corresponded to the range of conditions encountered from acid pickling to saturated brine curing. Fluoride and chloride salts stabilised collagen whereas the bromides and iodides tented to stabilise at low concentrations in acid solution only, but were structural destabilisers at high concentration. Halide effects were strongly pH-dependent and a feature of the results was the relatively small increase in collagen stability in saturated sodium chloride at neutral pH (curing conditions) compared with the large stability increase found at saturation at acid pH. Alkali sulphates on the other hand, stabilised fibrous collagen substantially at all pH levels. Assuming that an increase in heat stability of collagen is also correlated with incresed resistance to bacterial attack, the results suggest that curing in acidified brine offers additional protection. In addition, salt concentration in acid medium can be substantially decreased without affecting the excess stability in collagen. Practical implications of these results are discussed with reference to the problem of salt reduction in curing and the use of sulphates as penetration assistants in Mimosa cure and rapid vegetable tannage. Note de contenu : - EXPERIMENTAL : Materials - Measurement of thermal stability - DISCUSSION : Salt-pH interactions in curing and pickling - Dry salt curing - Drum brining - Alkali sulphate effects on collagen stability En ligne : https://drive.google.com/file/d/18d5da53f-G1PlxshtuMMV7m-aC4L1LqN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31041 [article]

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Salt-pH effects on collagen thermal stability in pickling and curing / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59, N° 1 (01-02/1975)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59, N° 1 (01-02/1975) . - p. 6-13 Titre : Salt-pH effects on collagen thermal stability in pickling and curing Type de document : texte imprimé Auteurs : A. E. Russel, Auteur Année de publication : 1975 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Collagène Halogénures pH Stabilité thermique Sulfates Le sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-. Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effects of alkali halides and sulphates on thermal stability of insoluble and precipitated fibrous collagens have been examined in the acid-to-neutral pH range. The salt-pH levels studied corresponded to the range of conditions encountered from acid pickling to saturated brine curing. Fluoride and chloride salts stabilised collagen whereas the bromides and iodides tented to stabilise at low concentrations in acid solution only, but were structural destabilisers at high concentration. Halide effects were strongly pH-dependent and a feature of the results was the relatively small increase in collagen stability in saturated sodium chloride at neutral pH (curing conditions) compared with the large stability increase found at saturation at acid pH. Alkali sulphates on the other hand, stabilised fibrous collagen substantially at all pH levels. Assuming that an increase in heat stability of collagen is also correlated with incresed resistance to bacterial attack, the results suggest that curing in acidified brine offers additional protection. In addition, salt concentration in acid medium can be substantially decreased without affecting the excess stability in collagen. Practical implications of these results are discussed with reference to the problem of salt reduction in curing and the use of sulphates as penetration assistants in Mimosa cure and rapid vegetable tannage. Note de contenu : - EXPERIMENTAL : Materials - Measurement of thermal stability - DISCUSSION : Salt-pH interactions in curing and pickling - Dry salt curing - Drum brining - Alkali sulphate effects on collagen stability En ligne : https://drive.google.com/file/d/18d5da53f-G1PlxshtuMMV7m-aC4L1LqN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31858 [article]

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The binding of TCMTB (busan 30L) to hide powder / W. M. Fowler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXV (Année 1990) . - p. 243-263 Titre : The binding of TCMTB (busan 30L) to hide powder Type de document : texte imprimé Auteurs : W. M. Fowler, Auteur ; A. E. Russel, Auteur Année de publication : 1990 Article en page(s) : p. 243-263 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The uptake of 2-(thiocyanomethylthio)benzothiazole (TCMTB) active ingredient from emulsion dispersion of Busan 30L on both limed and lightly chromed hide powder at treatment temperatures of 10°, 25° and 40°C has been investigated. Fungicide uptake was determined by difference measurements on the float at regular intervals during treatment. At lower fungicide treatment concentration on both chromed and limed hide powder, binding tended to follow a typical mass-action-type binding isotherm with very little change with temperature between 13 and 40°C. At higher float concentrations on chrome hide powder an inflexion point was apparent beyond which uptakes showed a further marked increase with concentration. This inflexion point signified a change in binding characteristics,but was not as marked on limed hode powder indicating that the chrome present played a major role in promoting the different binding mechanism. The binding isotherms observed were consistent with mass-action-controlled interactions occuring between collagen or chromed collagen or chromed collagen fibres and dispersed TCMTB in the aqueous emulsion treatments, encompassing the practical lower application range used in production. At higher treatment concentrations, progressive destabilisation of the emulsion occured, leading to surface precipitation of TCMTB/surfactant components onto the hide-powder fibres and a pronounced increase in uptake. The results of the study provide further insight into the modes of interaction of TCMTB with the hide-powder-collagen matrix and the importance of the emulsion dispersion and its stability in determining uptake of fungicide by leather. En ligne : https://drive.google.com/file/d/1e1u10HVBgUKW-dRPDEDWsbsbxnapo2iS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8685 [article]

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