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Anaerobic biological degradation of protein hydrolysate cross-linked with higher-molecular weight diepoxides / J. H. Krncirik 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. 36-45 Titre : Anaerobic biological degradation of protein hydrolysate cross-linked with higher-molecular weight diepoxides Type de document : texte imprimé Auteurs : J. H. Krncirik, Auteur ; J. Pseja, Auteur ; J. Kupec, Auteur ; R. Noskova, Auteur ; J. Olsak, Auteur Année de publication : 2009 Article en page(s) : p. 36-45 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This work focuses on the influence of cross-linking with higher-molecular glycol diepoxides (and glycerol triglycidyleter) on biologic anaerobic degradation of protein hydrolysate (trade name hykol) produced from chrome-tanned wastes (shavings). Samples of hykol cross-linked with selected higher-molecular diepoxides were degraded with anaerobic sludge from a municipal plant at concentrations, in which organic carbon in samples in test bottles was approx. 200 mg/L, dry matter (inoculum) was 4.5g/L, temperature 35+. Biodegradation of tested modified hydrolysate samples produced recorded quantities of biogas (CH4, CO2). Anaerobic degradation rate of the samples was least reduced when polyethylene glycol (600) diglycidyl ether was employed as the cross-linking agent, and most reduced when glycerol triglycidyl ether was applied. Attention was also given to preparation, the determination of solubility, intrinsi viscosity and IR spectra of prepared samples. In comparison with hykol the degree of degradation decreased approx. from 70-50 %. These modified hydrolysates were studied as materials which have the potential to be used as good biodegradable films, e.g. for agricultural applications. En ligne : https://drive.google.com/file/d/1MdlhdTAmrkWu7eqoukXrIv9L8I0wAdRe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4475 [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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Treatment and valorization of leather industry solid wastes : a review / Soufiane Tahiri 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. 52-67 Titre : Treatment and valorization of leather industry solid wastes : a review Type de document : texte imprimé Auteurs : Soufiane Tahiri, Auteur ; Miguel de La Guardia, Auteur Année de publication : 2009 Article en page(s) : p. 52-67 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The state-of-the art of the different approaches available in the scientific literature for the treatment and valorization of solid wastes generated from the leather industry has been presented in this review. Tanning processes generate significant volumes of by-products and waste materials and, because of that, tanneries can cause serious negative environment impacts. The advancement of laws protecting the environment have prompted industrialists, environmentalists and scientists to look for the decontamination of wastes and to transform tannery solid waste materials to valuable co-products useful to be recycled or employerin other industries. Examples of the preparation of organic fertilizers, production of biomaterials, gelatins or collagens with multiple applications and production of energy by biomethanization have been proposed as solutions for untanned wastes. Several applications and treatments were proposed for tanned wastes, such as preparation of materials with multiples uses, recovery of proteins and chromium and their valorization, incineration, use of the solid tannery wastes as sorbents or adsorbents for removal of organic pollutants from wastewaters, etc. On the other hand, tannery sludges can be treated and recycled in tanning process or used for various applications in other industries. This paper has been focused onsolutions and answers for researchers and concerned industry leaders who are seeking to improve the environmental quality of their activities in the tannery field. En ligne : https://drive.google.com/file/d/1VIya48zY-RAfKkDI0gb4kc4axHv9icF_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4477 [article]

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