Ecological and innovative fungicide for the leather industry : Essential oil of Origanum minutiflorum / Eser Eke Bayramoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 3 (03/2006)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 3 (03/2006) . - p. 96-104 Titre : Ecological and innovative fungicide for the leather industry : Essential oil of Origanum minutiflorum Type de document : texte imprimé Auteurs : Eser Eke Bayramoglu, Auteur ; G. Gulumser, Auteur ; Ismail Karaboz, Auteur Année de publication : 2006 Article en page(s) : p. 96-104 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Origanum minutiflorum (oregano) is an endemic species in Türkiye, from which essential oil is produced from its leaves and flowering tops by steam distillation. The antimicrobial activity of essential oil is known for years and many studies concerning its applications on different fields (medical science, pharmacy, food industry, etc.) have been carried out due to its advantages of being natural and nonmutagenic. The objective of this study was to examine the applicability of Origanum minutiflorum essential oil as a fungicide against fungus that grows on leather during the pickling and tanning processes. In the study, 2-Thiocyano-methylthiobenzotiazole (TCMTB) and N-octyl-isothiazolinone (N-OITZ) containing commercial fungicides were also used as controls. During the microbiologic tests, the growth of mould species like Aspergillus niger, Alternaria alternata, Penicillium rubrum and Trichoderma viride that cause problems in leather industry were also investigated against this essential oil and the fungicides. The results of this study show that oregano essential oil has antifungal activity and its effect improves with increasing concentration. Comparison of the experimental results reveals that leather treated with oregano essential oil is even more resistant against test moulds than leather treated with commercial fungicide at their recommended dosage. En ligne : https://drive.google.com/file/d/1_hrnp3U2bPsLkly0FamqXhKodSpk20fk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4020 [article]

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Increased chromium tanning efficiency with collagen hydrolysates / A. Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 5 (09-10/2006)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 90, N° 5 (09-10/2006) . - p. 201-204 Titre : Increased chromium tanning efficiency with collagen hydrolysates Type de document : texte imprimé Auteurs : A. Aslan, Auteur ; G. Gulumser, Auteur ; Bugra Ocak, Auteur Année de publication : 2006 Article en page(s) : p. 201-204 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux de moutons Extraction (chimie) Hydrolysat de collagène Prétannage Tannage au chrome Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Collagen hydrolysates obtained from shavings of chrome tanned sheep skins were used in a pretanning process for sheepskins and the effect on the efficiency of chrome tanning was observed. Various physical tests and chemical analyses were applied to tanned sheepskins and the results were evaluated statistically. Wet-blue leathers pretanned with 5% protein by-product (collagen hydrolysates) showed increased chromium take-up and had better physical characteristics. Note de contenu : - EXPERIMENTAL PROCEDURE : Extraction of collagen hydrolysates - Determination of some chemical characteristics of collagen hydrolysates - PROCESSING OF SKINS : Determination of physical and chemical characteristics of tanned leathers - Table 1 : Amino acid contents of collagen hydrolysates - Table 2 : Certain chemical characteristics of collagen hydrolysates - Table 3 : Production recipe used on skins - Table 4 : Physical and chemical test results - Table 5 : Colour values of wet-blue leathers pretanned with collagen hydrolysates En ligne : https://drive.google.com/file/d/1hL_nkvmDqKqoYYPK-P2Ps5sbFi48z_DN/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39057 [article]

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Use of silk hydrolysate in chrome tanning / G. Itirli Aslan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 5 (09-10/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 5 (09-10/2014) . - p. 193-198 Titre : Use of silk hydrolysate in chrome tanning Type de document : texte imprimé Auteurs : G. Itirli Aslan, Auteur ; G. Gulumser, Auteur ; Bugra Ocak, Auteur ; Ahmet Aslan, Auteur Année de publication : 2014 Article en page(s) : p. 193-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Teneur en oxyde de chrome Cuirs et peaux de moutons Déchirure (mécanique) Eaux usées -- Epuration Hydrolysats de protéines Soie et constituants Tannage au chrome Température de retrait Traction (mécanique) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : This study examined the characteristics and environmental load of sheep skins that had been treated with silk hydrolysate by two different methods : prior to tannage and after tannage. Silk hydrolysate was applied to the leathers before and after tanning in four different proportions. The chrome oxide content and shrinkage temperature, tensile strenght and tear load of the leathers increased as the proportion of silk hydrolysate increased, and the highest levels of chrome exhaustion in the tanning effluents were obtained at an application level of 5% on the basis of leather weight. In addition, silk hydrolysate was found to improve wastewater parameters such as chemical oxygen demand, total suspended solids, total dissolved solids, salinity and electrical conductivity. Note de contenu : - Chrome content in the exhausted process liquor - The amounts of chrome oxide in the leather samples - Shringkage temperature - Tensile strength and tear load tests - The effect on surface colour of various proportions of SH - TSS - TDS, salinity, and electrical conductivity - TN En ligne : https://drive.google.com/file/d/1hUtrNymUx0gmO7t1DedDR43gUQUUbqDc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22208 [article]

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Utilization of collagen hydrolysate in keratinase production from bacillus subtilis ATCC 6633 / Ahmet Aslan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 4 (04/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 4 (04/2007) . - p. 129-134 Titre : Utilization of collagen hydrolysate in keratinase production from bacillus subtilis ATCC 6633 Type de document : texte imprimé Auteurs : Ahmet Aslan, Auteur ; Huseyin Ata Karavana, Auteur ; G. Gulumser, Auteur ; I. Yasa, Auteur ; B. H. Cadirci, Auteur Année de publication : 2007 Article en page(s) : p. 129-134 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this study, chrome shavings from tanning industry were hydrolyzed with a commercial protease in alkali medium. Some chemical analyses were made and amino acid composition of collagen hydrolysate obtained from chrome shavings determined. This collagen hydrolysate was used for the production of keratinase from Bacillus subtilis ATCC 6633 as a carbon and nitrogen source. The culture grew in fermentation medium containing various proportion of collagen hydrolysate (1-5% w/v) at pH 7.0 and pH 10.0 with agitation rate of 200 rpm. The best keratinase production was obtained from the medium containing 1% hydrolysate (w/v) at pH 7.0 for 36 hours and with 3% hydrolysate (w/v) at pH 10.0 for 24 hours. En ligne : https://drive.google.com/file/d/1fF1_2B0896goPd5Blqsss2iwmxQUJdnn/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3361 [article]

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