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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Contribution to assessing cross-linking of protein hydrolyzate with diepoxides / J. Hrncirik in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 12 (12/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 12 (12/2007) . - p. 393-403 Titre : Contribution to assessing cross-linking of protein hydrolyzate with diepoxides Type de document : texte imprimé Auteurs : J. Hrncirik, Auteur ; J. Pseja, Auteur ; J. Kupec, Auteur ; M. Tupy, Auteur Année de publication : 2007 Article en page(s) : p. 393-403 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : This work summarizes the influence exerted on cross-linking of protein hydrolyzate obtained through enzymatic hydrolysis of chrome-tanned leather shavings, by means of diepoxides (1,2:3,4 diepoxybutane and 1,2:7,8 diepoxyoctane). Attention was given to preparation of cross-linked samples, their solubility, intrinsic viscosity and IR spectra. Suitable conditions for cross-linking were found at pH = 9 and 25˚ C temperature. Solubility of samples decreased proportionately with increasing concentrations of cross-linking agent. Viscosity measurements yielded best results in 1M KCl solution. Determining intrinsic viscosity indices proved this value was influenced more by the approach of the gelation point than by the epoxide content. IR spectra demonstrated that in the region of wave numbers 838, 912 and 1,250 cm-1, peaks of epoxide groups of employed pure cross-linking agents coincide with similar peaks of other groups of cross-linked samples; peaks of epoxide bonds at the mentioned wave numbers are discernible only with highest employed concentrations of cross-linking agents. Future research will address examining various epoxy groups, employing di- or multifunctional amines and determining critical gelation conversions and critical stoichiometric ratios of defined substances. En ligne : https://drive.google.com/file/d/1FrqqGPZyQdgm9I3ga_nynP9S_tYxkhHl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3316 [article]

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