Application of protein hydrolysate from chrome shavings for polyvinyl alcohol-based biodegradable material / Martina Kresalkova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 4 (04/2002)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVII, N° 4 (04/2002) . - p. 143-149 Titre : Application of protein hydrolysate from chrome shavings for polyvinyl alcohol-based biodegradable material Type de document : texte imprimé Auteurs : Martina Kresalkova, Auteur ; Karel Kolomaznik, Auteur ; J. Kupec, Auteur ; L. Hnanickova, Auteur Année de publication : 2002 Article en page(s) : p. 143-149 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of hydrolysate from chrome-tanned wastes for producing biodegradable plastics particularly applicable in agriculture requires management of the breakdown of modified compounds of synthetic polymers. In this work, the additive applied for this purpose was protein hydrolysate produced by enzymatic hydrolysis of chrome-tanned shavings. It was used for modifying polyvinyl alcohol which had been processed into water-soluble films often employed in agriculture. This material, after being deposited in soil, undergoes biological degradation (first of all anaerobic) which is supported to a large extent by the addition of protein hydrolysate in particular. For this reason, anaerobic biodegrability tests were performed (volumetric test determining methanogenic activity) and the corresponding percentage of degradation was determined based on a balance of produced biogas and inorganic carbon in the aqueous phase. Polyvinyl alcohol is relatively poorly degradable under aerobic conditions while protein hydrolysate, on the contrary, undergoes biodegradation at a fairly fast rate. From a comparison between the attained degradation degree of blow-extruded film and that of mechanically prepared compounds it follows that the limiting factor of degradability, apart from added protein hydrolysate, is also a chemical reaction between polyvinyl alcohol and hydrolysate taking place during the heat processing of film. It was confirmed that protein hydrolysate from chrome shavings markedly increases biodegradation of material (depending on its content in the plastic matrix), reduces the final cost of product and, last but not least, to some extent also exerts a positive influence on mechanical properties of the film. En ligne : https://drive.google.com/file/d/1DG9POYCMMG1n3uWy8vr5u2otxOhr9-u2/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4312 [article]

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Automatic control of recycling technology for chromium from liquid and solid tannery waste / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 3 (03/2005)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. C, N° 3 (03/2005) . - p. 119-123 Titre : Automatic control of recycling technology for chromium from liquid and solid tannery waste Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; F. Langmaier, Auteur ; Milan Mladek, Auteur ; Ivan Zelinka, Auteur ; Vladimir Vasek, Auteur Année de publication : 2005 Article en page(s) : p. 119-123 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A low cost computer-controled system to recycle chromium containing liquid and solid waste from the tanning industry is described. The mathematical model for the recycling technology is based on the chemical-physical engineering description of the heterogeneous kinetics of the process. Regressive analysis was used to determine values for the parameters in each kinetic equation from experimental data. The idea for the recycling technology lies in using the reaction of non-environmentally friendly chromium containing liquid and solid wastes and creating new products that are not toxic and can be used in other industrial applications. The proposed model was used for a simulation test and for an optimum calculation in connection with minimum operating costs of the recycling technology. The process, including the computer control system, was demonstrated with laboratory equipment using real chromium-containing liquid and solid waste obtained from a beam house. En ligne : https://drive.google.com/file/d/1geHnt9zhxaD-BmLDJivwzp4h_j9qUCm0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4075 [article]

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Characterization of low-molecular weight collagen hydrolysates prepared by combination of enzymatic and acid hydrolysis / Vera Kasparkova in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 2 (02/2009)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 2 (02/2009) . - p. 46-51 Titre : Characterization of low-molecular weight collagen hydrolysates prepared by combination of enzymatic and acid hydrolysis Type de document : texte imprimé Auteurs : Vera Kasparkova, Auteur ; Karel Kolomaznik, Auteur ; Lenka Burketova, Auteur ; Vladimir Sasek, Auteur ; Lubomir Simek, Auteur Année de publication : 2009 Article en page(s) : p. 46-51 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Formic, phosphoric and nitric acids were used for hydrolysis of the commercially available hydrolysis product of chrome shavingshykol-E. The aim of the work was to prepare low-molecular weight product (Mw<5000g.mol-1) to be used as the plant bio-stimulator. Course of hydrolysis was monitored by following the changes of molecular weight (MW) and molecular weight distribution (MWD) determined by gel permeation chromatography (GPC). The study demonstrated that MW and MWD of hydrolysates are influenced by the choice of hydrolysing acid, its concentration as well as by the time of acid treatment. Using the combination of enzymatic and acid hydrolysis, it is possible to prepare products with the tailor-mad, pre-defined molecular weight fitting the intended use. En ligne : https://drive.google.com/file/d/1LRImzzKPw7USB1lhN-TUGnOGKM2iusKO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4476 [article]

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Closed loop for chromium in tannery operation / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 12 (12/2003)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 12 (12/2003) . - p. 487-490 Titre : Closed loop for chromium in tannery operation Type de document : texte imprimé Auteurs : Karel Kolomaznik, Auteur ; Maryann M. Taylor, Auteur ; Dennis C. Shelly, Auteur ; F. Langmaier, Auteur ; Milan Mladek, Auteur Année de publication : 2003 Article en page(s) : p. 487-490 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Even though the leather industry is environmentally important as a user of a byproduct of the meat industry, it is still perceived as a consumer of resources and a producer of pollutants. When processing one metric ton ofrawhide, 200 kg of a leather-final product is obtained, and only 20% of the raw material weight is converted to leather. The biggest problem, and one that is now under scrutiny, is the disposition of chrome-tanned solid wastes. To keep the chromium from tanned wastes within control limits we have worked out a modified enzymatic dechromation technology and developed it into an industrial scale with a daily capacity of three metric tons of chrome shavings. The chromium-containing sludge, isolated by this technology, contains 10-15% magnesium oxide, and is used (here) as a precipitator for chromium in spent tanning liquor. We treated a spent liquor containing 2294 ppm of chromium with the chromium sludge, obtained from the enzymatic reaction. After the treatment, the content of chromium decreased from the original 2294 ppm to 6 ppm, which means that practically total dechromation of the waste chrome water has occurred. This chrome removal from the spent tanning liquor, using the chrome sludge from digestion of the chrome-tanned solid wastes, effectively provides a closed loop for chromium in tanning operations. En ligne : https://drive.google.com/file/d/1WJKf1eo9Vp5pwBgM-FilabOY9odb4alH/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4170 [article]

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Collagenous hydrolysates from untraditional sources of proteins / F. Langmaier in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 23, N° 4 (08/2001)  

[article]  inINTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 23, N° 4 (08/2001) . - p. 193-199 Titre : Collagenous hydrolysates from untraditional sources of proteins Type de document : texte imprimé Auteurs : F. Langmaier, Auteur ; S. Sukop, Auteur ; Karel Kolomaznik, Auteur ; M. Mladek, Auteur Année de publication : 2001 Article en page(s) : p. 193-199 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Collagen  Hydrolysate  Short  cattle  tendons Index. décimale : 668.5 Parfums et cosmétiques Résumé : On a préparé par des méthodes biotechnologiques des hydrolysats de collagène suffisamment purs, adéquats pour des applications en cosmétiques de soin pour la peau et les cheveux, en utilisant des préparations enzymatiques, disponibles dans le commerce, à partir de tendons courts de bétail (musculus extensor communis, musculus flexor digitorum, musculus flexor digitorum profundis). Ces hydrolysats ne contiennent pas de composants lipoïdes ni d'aminosaccharides, la teneur en groupes amine primaire atteint environ 1.1 mmol g-1 et le poids moléculaire moyen des hydrolysats de collagène résultants de dépasse pas 2000 g mol-1 (2.0 kDa). Les tendons courts de bétail représentent une source relativement pure et facilement disponible de collagènes et sont, en dépit de leur faible valeur nutritionnelle généralement connue, seulement utilisés comme composant de mélanges nutritifs. DOI : 10.1046/j.0412-5463.2001.00081.x En ligne : https://onlinelibrary.wiley.com/doi/10.1046/j.0412-5463.2001.00081.x Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4848 [article]

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Collagenous hydrolysates from untraditional sources of proteins. Reaction condition and the yield of enzymatic hydrolysis of short cattle tendons / F. Langmaier in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 23, N° 4 (08/2001)  

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Dechroming spent tanning liquor using filtration cake from enzymatic hydrolysis of chromium shavings / P. Kocurek in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 6 (11-12/2015)  

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Deliming of un-bonded and bonded lime from white hide / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 5 (05/2007)  

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Deproteination of chrome waste by washing and enzymatic hydrolysis / J. Kupec in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)  

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Development of a control algorithm for the optimized soaking of cured hides / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 9 (09/2006)  

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Economic aspects of biodiesel production from tannery waste fats / Karel Kolomaznik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 10 (10/2010)  

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Functional properties of hydrolysis products from collagen / Maryann M. Taylor in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIII, N° 2 (02-03/1998)  

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Gel-sol transitions of chrome tanned leather waste hydrolysate / F. Langmaier in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 3 (05-06/2001)  

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High quality biodiesel and glycerin from fleshings / Jiri Pecha in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 10 (10/2012)

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Isolation of elastin and collagen polypeptides from long cattle tendons as raw material for the cosmetic industry / F. Langmaier in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 24, N° 5 (10/2002)  

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Kinetics of alkaline hydrolysis of the insoluble protein fraction following enzymatic hydrolysis of chrome-tanned shavings / J. Hrncirik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 1 (01/2005)  

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Mathematical model of raw hide curing with brine / Eduard Hernàndez Balada in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 5 (05/2008)

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Mathematical model of soaking. Part I / A. Blaha in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)  

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Mathematical model of the soaking process, part II / A. Blaha in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 73 (Année 1989)  

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Modern approach to automatic control of enzymatic hydrolysis of tannery waste / Vladimir Vasek in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 9 (09/2010)  

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