Alternative tanning agent for leather industry from a sustainable source : Dialdehyde starch by periodate oxidation / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 3 (03/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 3 (03/2021) . - p. 89-99 Titre : Alternative tanning agent for leather industry from a sustainable source : Dialdehyde starch by periodate oxidation Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur Année de publication : 2021 Article en page(s) : p. 89-99 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Amidon dialdéhyde Amidons -- Oxydation Caractérisation Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Poids moléculaires Tannage Tannage -- Aspect de l'environnement Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dialdehyde starches with different aldehyde content from native corn starch were prepared by sodium periodate oxidation to be used as a tanning agent in leather making. For this purpose, native corn starch was oxidized with sodium metaperiodate in different molar ratios. After oxidation processes, the yields, solubility in water and aldehyde contents of the obtained dialdehyde starches were determined as well as structure characterizations by Proton Nuclear Magnetic Resonance Spectroscopy, Fourier Transform Infrared Spectroscopy and Gel Permeation Chromatography. Evaluating the gel permeation chromatography data, the dialdehyde starch samples which were thought to be in appropriate molecular weight/size to penetrate into skin fibers were selected to be used in the tanning process. Their tanning abilities were evaluated by investigating hydrothermal stabilities, filling and fiber isolation characteristics and physical properties determined by mechanical tests and organoleptically. From the evaluation of the results, it was revealed that sodium metaperiodate oxidized starches which have appropriate molecular weight and adequate aldehyde content has a remarkable tanning effect and can be utilized as a tanning agent with the advantages of not necessitating pickling process which means saving time and simplifying the production but more importantly offering an important advantage from an environmental point of view. Note de contenu : - Characterizations - Tanning properties of dialdehyde starch samples - Table 1 : Tanning recipe for the pelt pieces - Table 2 : Molecular weight distribution of native and oxidized starches - Table 3 : Tanning properties of oxidized starches - Table 4 : Physical properties of tanned leathers with oxidized starches - Table 5 : Organoleptical properties of tanned leathers with oxidized starches DOI : https://doi.org/10.34314/jalca.v116i3.4249 En ligne : https://drive.google.com/file/d/1Ao7z1sapfoabaz0Uek5C2uMsZkBOMAoh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35436 [article]

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Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation / Cigdem Kilicarislan Ozkan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 245-249 Titre : Determination of antioxidant properties of commonly used vegetable tannins and their effects on prevention of Cr(VI) formation Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur ; Deniz Kalender, Auteur Année de publication : 2015 Article en page(s) : p. 245-249 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Chrome hexavalent Cuirs et peaux -- Analyse Essais accélérés (technologie) Gallo-tanins Phénols Tanins végétaux Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Even though Cr(VI) is not used in any step of leather making, the presence of Cr(VI) in leather has become a concern in the leather industry. Free radicals usually play an important role in the formation of Cr(VI) in leather. The effectiveness if antioxidant materials in preventing free radical formationis well know. Tannins as phenolic materials are also know to have antioxidant properties. However, the antioxidant effectiveness shows variations regarding to the type and structure of tannins. In the present study, the vegetable tannins which are commonly used in the leather industry (mimosa, quebracho, sumac, tara, valonea and chesnut) were selected and their antioxidant powers were determined by FRAP (The Ferric Reducing Ability of Plasma) and TEAC/ABTS (Trolox-Equivalent Antioxidant Capacity/2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)) methods. Furthermore, these vegetable tannins were used in leather processing and their effect on prevention of Cr(VI) formation was examinated. The results show that gallotannins within the hydrolysable tannins have taken the first places in ranking with superior antioxidant activities and, compatible with their antioxidant powers they were found to be the most effective tannin types at preventing Cr(VI) formation. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Methods - Determination of total phenols - Determination of antioxidant powers of vegetable materials - Usage of vegetable materials in leather production - Artificial ageing of leather samples and Cr(VI) analysis - RESULTS AND DISCUSSION : Total phenolic contents and antioxidant powers of plant extracts - Cr(VI) contents of leather samples En ligne : https://drive.google.com/file/d/1WP5LL0UQzKzcsUhjHNEQVtZlf7a-84TZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24655 [article]

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Lightfastness properties of leathers tanned with various vegetable tannins / Hasan Ozgunay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 10 (10/2008)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIII, N° 10 (10/2008) . - p. 345-352 Titre : Lightfastness properties of leathers tanned with various vegetable tannins Type de document : texte imprimé Auteurs : Hasan Ozgunay, Auteur Année de publication : 2008 Article en page(s) : p. 345-352 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The color changes of bovine leathers, tanned with commonly used hydrolysable and condensed vegetable tannins, were measured colorimetrically as a function of prolonged irradiation with xenon tet light. the results showed that hydrolysable and condensed tannins exhibited differences in their light fastnesses. The color change of hydrolysable tannins under the effect of light was considerably low when compared to the condensed tannins. Gambier and quebracho tannins, among the condensed tannins, exhibited a rapid color change in the direction of red and yellow,while mimosa showed a slower color shift. Tara, among the hydrolysable tannins, exhibited a slower color shift than the others. At the end of 24 hours, the color changes, observed as darkening in all the tannin groups reached a maximum point after which color lightening was observed with extended time. En ligne : https://drive.google.com/file/d/1VgXfgBdglQVC9trAOvAgGCSegcL990X1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2411 [article]

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Molecular investigation of valonea tannin / Hasan Ozgunay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CII, N° 5 (05/2007)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CII, N° 5 (05/2007) . - p. 154-157 Titre : Molecular investigation of valonea tannin Type de document : texte imprimé Auteurs : Hasan Ozgunay, Auteur ; O. Sari, Auteur ; M. Tozan, Auteur Année de publication : 2007 Article en page(s) : p. 154-157 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Valonea is one of the well-known vegetable tannins, used for tannage and retanning processes in leather making. Although it is used very extensively in the leather industry, its main components and chemical structure are only gradually being identified. In order to investigate the chemical structure of valonea with novel techniques, MALDI-TOF (Matrix-Assisted Laser Desorption/Ionisation Time-of-Flight) and FTIR (Fourier Transform Infrared) Spectroscopy were used. The MALDI-TOF spectrum showed the presence of low molecular weight fraction of hydrolysable tannins such as nonahydroxytriphnoic, flavogallonic acid, ellagic and gallic acid, pentagalloylglucose and all sorts of degradation and oxidation products which are thought to be major components of valonea tannin. Moreover, castalagin/vescalagin and those added by a few residual structures/atoms, thus creating larger molecule and greater mass than castalagin/vescalagin, derived by internal rearrangements of a larger molecule constitute major components of valonea. En ligne : https://drive.google.com/file/d/1hMr5rCXaRvKqZixOP6Sa22ehFlRnfyvC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3356 [article]

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A new defect on leather : microbial bio-film / B. H. Cadirci in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 4 (04/2010)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 4 (04/2010) . - p. 129-134 Titre : A new defect on leather : microbial bio-film Type de document : texte imprimé Auteurs : B. H. Cadirci, Auteur ; Hasan Ozgunay, Auteur ; C. Vural, Auteur ; Onur Yilmaz, Auteur Année de publication : 2010 Article en page(s) : p. 129-134 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Biofilms Cuirs et peaux -- Défauts Microscopie électronique à balayage Réaction en chaîne par polymérase Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hides and skins are protein based materials containing high amounts of water, which makes them a nutritionally rich media ideal for bacterial growth. Being also the essential raw materials in leather manufacture, it is vital to carefully protect them against bacterial action especially in the early wet processing stages. It is well known that bacterial action can seriously damage the fiber structure of hides and skins. Hair slip, red discoloration and grain pilling are typical examples of bacterial action can lead to damage with subsequent defects on the tanned leather. The present study identifies a new defect caused by bacteria known as "biofilm" on hides and skins. For investigation of the observed defective areas, two techniques were used : Scanning Electron Microscopy (SEM), and Real-Time Polymerase Chain Reaction (RT-PCR). The latter technique, RT-PCR, is a novel rapid method for unique detection, identification and quantification of microorganisms. The results, obtained by applying these techniques, verified the presence of "microbial biofilm" on the leather. Note de contenu : - Material - Methods : Imaging the leather samples - Molecular biological analysis of leather samples - Total bacterial DNA isolation - Real-time PCR En ligne : https://drive.google.com/file/d/1lzl-nEsnCg7Zyv8GaiccDIXZlEQVcbDE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21998 [article]

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A novel way to avoid Cr(VI) formation in leather : copper mordanting / Cigdem Kilicarislan Ozkan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

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Ozone as a biocide in soaking / M. Mete Mutlu in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 1 (01-02/2009)  

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Production of carboxymethyl starches from oxidized starches and determination of their tanning characteristics / Hasan Ozgunay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 6 (06/2021)  

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Reducing the amount of tanning materials passing into wastewater in post-tanning processes / Selime Colak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 3 (03/2005)  

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Retanning performance of carboxymethyl starch and its effects on dyeing / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)  

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Ultrasound extraction of valonea tannin and its effects on extraction yield / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 11 (11/2012)  

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Utilization of leather industry pre-fleshings in biodiesel production / Selime Colak in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. C, N° 4 (04/2005)  

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