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 chromium-tanned leather solid wastes in microencapsulation / Bugra Ocak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 232-238 Titre : Utilization of chromium-tanned leather solid wastes in microencapsulation Type de document : texte imprimé Auteurs : Bugra Ocak, Auteur ; Ahmet Aslan, Auteur ; Gürbüz Gülümser, Auteur Année de publication : 2011 Article en page(s) : p. 232-238 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Collagène Cuir -- Déchets Encapsulation Fourier, Spectroscopie infrarouge à transformée de Glutaraldéhyde Huile essentielle de lavande Hydrolysats de protéines Microscopie électronique à balayage Récupération (Déchets, etc.) Recyclage (déchets, etc.) Tannage au chrome Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this research, solid collagen-based protein hydrolysate was isolated from chromium-tanned leather wastes and its chemical properties were determined. After that, the use of collagen hydrolysate (CH) was investigated as a polymeric wall material in the microencapsulation process. The effects of variations in concentrations of CH, lavender oil (LO) and glutaraldehyde (GA), which were used during the microencapsulation process, on the oil load of microcapsules, oil content, encapsulation efficiency and release rate of oil were determined. The morphological structure of the microcapsules was investigated using optical and scanning electron microscopes (SEM). It was determined by FTIR studies that there was no evidence for any significant interaction between CH and LO. Note de contenu : MATERIALS AND METHODS : Preparation of collagen hydrolysate - Phase separation behaviour of collagen hydrolysate - Preparation of microcapsules - Determination of some chemical characteristics of collagen hydrolysate - Calibration curve of lavender oil - Determination of the oil load, oil content and encpsulation efficiency - Oil release studies - Optical and scanning electron microscopy studies - FTIR study. RESULTS AND DISCUSSION : Some chemical characteristics of collagen hydrolysate - The effect on microcapsules of variations in oil concentration - Effects of variation of hydrolysate concentration - The effect of variation in glutaraldehyde concentration - Optical and scanning electron microscopic studies - Fourier Transform Infrared (FTIR) study. En ligne : https://drive.google.com/file/d/1vpL-zU-enBe_sD-OaV0OOevqpaXvpKVM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12033 [article]

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