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Studies on the influence of proteolytic enzymes in leather dyeing / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)
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Titre : Studies on the influence of proteolytic enzymes in leather dyeing Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; S. Sadulla, Auteur ; Chandra Babu Narasimhan Kannan, Auteur ; Arjunan Yasothai, Auteur ; P. Chitra, Auteur ; Malathy Jawahar, Auteur ; Balaraman Madhan, Auteur ; R. Venba, Auteur Année de publication : 2006 Article en page(s) : p. 435-443 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Dyeing is an important process in the leather industry. It is well known that many of the dyes used do not exhaust completely and this causes concern, as the biotreatability of the unexhausted dyes in effluent is normally difficult. Environmental concern demands the improvement of the exhaustion of dye. To achieve increased uptake of dye, an eco-friendly dyeing process is designed using enzymes. The effect of varying conditions of enzymatic treatment on the exhaustion of the dye, levelness of the dyeing, shade brightness and color intensity have been studied and the conditions optimized. The improvement in dye exhaustion is accomplished using extremely low amounts of enzymes in the presence of other post tanning auxiliaries at optimized pH, temperature and running time. The change in shades obtained is quantified by reflectance measurements and compared with the visual assessment data. Scanning electron microscopy analysis showed an opened up and cleaned fiber matrix with enzymatic treatment. The bulk properties viz., softness and grain smoothness are found to be marginally improved in the enzyme treated leathers. The strength properties are not significantly altered by the use of enzymes in the post tanning process. En ligne : https://drive.google.com/file/d/1M5EoprOEdJg2hG7DlXzk2ZVNqOyT1NwK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3852
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CI, N° 12 (12/2006) . - p. 435-443[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005986 - Périodique Bibliothèque principale Documentaires Disponible Studies on the removal of inter-fibrillary materials part I : Removal of protein, proteoglycan, glycosoaminoglycans from conventional beamhouse process / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 5 (05/2010)
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Titre : Studies on the removal of inter-fibrillary materials part I : Removal of protein, proteoglycan, glycosoaminoglycans from conventional beamhouse process Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 145-149 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The removal of the inter-fibrillar materials viz., proteins, proteoglycans and glycosoaminoglycans (GAGs) are the integral part of conventional liming and bating processes. However, precise quantification on the removal of these interfibrillar materials is still lacking. Hence, in the present work quantification on the removal of protein, proteoglycans and glycosaminoglycans (from goat skins) during liming and bating was attempted. An understanding of the removal of these inter-fibrillar materials precisely could help in developing objective process control measures. Alternative techniques can be developed as it is known that conventional liming processes contribute to more than 60 % of the total pollutionload. The quantification of proteins, proteoglycans and glycoaminoglycans was standardized to suit the requirement for the estimation of the samples obtained from beamhouse process liquors (from liming to bating). It is observed that 3,2 % proteins, 1,2 % proteoglycans and 0,04 % GAGs are released (based on wet salted weight) in the pretanning processes, from liming to bating. removal of proteoglycans during liming has been found to be dependent on the duration of liming process. En ligne : https://drive.google.com/file/d/1XNT4QFwe_VUEsO1eT5sS1xYqwMjQx9YP/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9360
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 5 (05/2010) . - p. 145-149[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012157 - Périodique Bibliothèque principale Documentaires Disponible Studies on the removal of inter-fibrillary materials. Part II : removal of protein, proteoglycan and glycosoaminoglycans from biobased pre-tanning process / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CV, N° 6 (06/2010)
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Titre : Studies on the removal of inter-fibrillary materials. Part II : removal of protein, proteoglycan and glycosoaminoglycans from biobased pre-tanning process Type de document : texte imprimé Auteurs : Balaraman Madhan, Auteur ; M. Dineshkumar, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur Année de publication : 2010 Article en page(s) : p. 181-188 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Eco-concerns are forcing the leather industry to shift itself from chemical based processing to bio-processing. The use of enzymes for unhairing and bating has been long established and well reported ; but the use of a-amylase for fiber opening is a recent development, which advocates the complete elimination of lime. Though the bio-based fiber opening process is established to be an eco-friendly alternative, it is essential to establish its effectiveness versus the conventional liming process by more objective methods. Hence in this work an attempt has been made for quantitative analysis or interfibrillary materials viz., proteins, proteoglycans and glycosoaminoglycans (GAGs) released from the skin matrix by the use of complete enzyme based beamhouse process, especially the effect of a-amylase in beamhouse processes. It is observed that treatment of 2 % a-amylase for a time period of 180 min is sufficient for the removal of optimum amount of inter-fibrillary materials especially, proteoglycans. Matched pair comparison of experimental bio-based processing has been made with conventional lime base processing and it is observed that the removal of proteoglycans were comparable in both these processes. Also, the crust leathers processed from the matched pair beamhouse processes were compared for their organoleptic and strength characteristics. Both experimental bio-processed leather and conventionnally processed control leather were observed to be comparable. THis work further authenticates that a completely bio-based beamhouse process is not only eco-friendly but also results in a similar effect on the removal of inter-fibrillary material compared to conventional lime based process. Note de contenu : EXPERIMENTAL : Materials / Effect of duration of a-amylase treatment during fiber opening process / Effect of washing after fiber opening on the release of proteins, proteoglycans and GAGs / Influence of varying percentage of a-amylase on the removal of proteoglycans from beamhouse bioproces method / Matched pair comparison on the removal of protein, proteoglycans and GAGs from conventional and experimental process / physical testing and hand evaluation.
RESULTS AND DISCUSSION : Effect of duration of a-amylase treatment on the removal of proteoglycan / Removal of protein, proteoglycan and GAGs : Influence of washing (time) after a-amylase based fiber opening / Influence of varying percentage of a-amylase on the removal of interfibrillary material and physical properties of the leathers / Matched pair comparison on the removal of protein, proteoglycans and GAGs from conventional and experimental process.En ligne : https://drive.google.com/file/d/1LWSav9X8M8LRJUZiSjfGY77h3htB5rUO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9453
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CV, N° 6 (06/2010) . - p. 181-188[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012187 - Périodique Bibliothèque principale Documentaires Disponible Studies on the stabilization of collagen using dialdehyde starch : Part I. Effect of autoclaving on dialdehyde starch / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 12 (12/2006)
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Titre : Studies on the stabilization of collagen using dialdehyde starch : Part I. Effect of autoclaving on dialdehyde starch Type de document : texte imprimé Auteurs : Swarna Vinodh Kanth, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Balachandran Unni Nair, Auteur ; S. Sadulla, Auteur ; T. Ramasami, Auteur Année de publication : 2006 Article en page(s) : p. 444-453 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Polysaccharides are abundant, non-toxic, biodegradable natural polymers possessing a high degree of functionality. Starch, an inexpensive and renewable material is modified and widely used as a raw material in various industries. Starch on selective oxidation gives dialdehyde starch (DAS), a polymeric dialdehyde. In this investigation tanning system using autoclaved dialdehyde starch (ADAS) has been explored. Autoclaving of DAS is found to result in hydrolysis to lower molecular weight oligomeric species. These lower molecular weight species show better tanning properties compared to unautoclaved DAS. Similar effect has also been observed on the use of DAS at alkaline conditions. Thermal and enzymatic stability of ADAS tanned leather at varied concentration, pH, time and temperature have been studied. Leathers with a maximum shrinkage temperature of 88°C have been obtained while using ADAS at pH 10. The ADAS tanned leather also imparted highest degree of, stability to collagen against collagenase at pH 10. Scanning electron microscopic analysis showed a well-coated fiber matrix. The leathers obtained using ADAS as tanning agent have been compared with chrome tanned leathers for organoleptic properties. En ligne : https://drive.google.com/file/d/1wQX26JG9XSgtHqb_LAsdaMCJt0wKEg9M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3853
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Code-barres Cote Support Localisation Section Disponibilité 005986 - Périodique Bibliothèque principale Documentaires Disponible Supercritical carbon dioxide based skin preservation : solving the soak liquor effluent crisis of the leather industry / Arun Gopinath in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 4 (04/2020)
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Titre : Supercritical carbon dioxide based skin preservation : solving the soak liquor effluent crisis of the leather industry Type de document : texte imprimé Auteurs : Arun Gopinath, Auteur ; Nagarajan Vedaraman, Auteur ; Balaraman Madhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Magesh Peter, Auteur ; Ramalingam Kirubagaran, Auteur Année de publication : 2020 Article en page(s) : p. 145-150 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acétone L'acétone en chimie, (nom officiel IUPAC propanone, aussi connue sous les noms de diméthylcétone, 2-propanone, propan-2-one et béta-cétopropane), de formule chimique CH3COCH3 est le composé le plus simple de la famille des cétones. C'est un isomère du propanal.L’acétone est un liquide transparent, inflammable, d'odeur caractéristique (plutôt fruitée). Sa température de fusion est de -95,4 °C et celle d'ébullition de 56,53 °C. Elle a une densité relative de 0,819 (à 0 °C). C'est un composé très soluble dans l'eau (c'est une molécule polaire à chaîne carbonée courte), dans l'éthanol et dans l'éther. L'acétone est le dérivé le plus simple de la série des cétones aliphatiques et la présence de la double liaison carbone-oxygène lui confère l'essentiel de sa réactivité.
Caractérisation
Cuir -- Teneur en chrome trivalent
Cuirs et peaux -- Conservation
Cuirs et peaux -- Microbiologie
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Séchage
Cuirs et peaux -- Teneur en eau
Dioxyde de carbone
Fluides supercritiques
Morphologie (matériaux)
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt-based preservation of hides/skins contributes to about 50% total dissolved solids (TDS) in tannery wastewaters. In this study, raw skins have been preserved by exposing them to a continuous flow of supercritical carbon dioxide (SCCO2) in a pressurized reactor. The process was carried out in reactors of two different capacities to ensure scalability. The skins thus dried could be stored at room temperature for a period of 30 days. The SCCO2–dried skins were less conducive for microbial growth than wet-salted skins. The soak liquor of SCCO2–dehydrated skin showed a 90% reduction in chloride content and significantly lower BOD and COD levels than soak liquor from wet-salted skins. The leathers produced from SCCO2-preserved skins and wet-salted skin had no significant quality differences. As SCCO2 systems have been reported as alternatives to all other unit operations, establishing SCCO2–based preservation will complete the circle of total leather manufacture with SCCO2. Note de contenu : - EXPERIMENTAL : Curing with SCCO2 - Acetone as a cosolvent - Moisture analysis of skin - Microbial analysis - Leather processing - Leather quality analysis - Measurement of shrinkage temperature - Evaluation of chrome content - Evaluation of physical strength and organoleptic properties - Examination of surface morphology and cross section - Emission parameters
- RESULTS AND DISCUSSION : Moisture content of raw skin - SCCO2 drying of skin - 250 ml reactor - SCCO2 drying of skin - 1.5-L reactor - Microbial load on preserved skin - Chemical and physical characterization - Surface morphology and cross section view - Organoleptic properties - Emission parametersDOI : https://doi.org/10.34314/jalca.v115i4.3801 En ligne : https://drive.google.com/file/d/16t6mCLzXMFlP7NL1IkcfnyH7VNUf_hzN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34160
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Code-barres Cote Support Localisation Section Disponibilité 21743 - Périodique Bibliothèque principale Documentaires Disponible Tanning agent based on mixed metal complexes of aluminium and zinc / Balaraman Madhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVI, N° 9 (09/2001)
PermalinkTanning with natural polymeric materials. Part 1 : Ecofriendly tanning using dialdehyde sodium alginate / Swarna Vinodh Kanth in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 91, N° 6 (11-12/2007)
PermalinkThe impact of potassium persulfate on linseed oil tanning / Bindia Sahu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 8 (08/2022)
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