Development of nano bio aldehyde tanning agent for sustainable leather manufacture / Arjunan Yasothai in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 4 (04/2023)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 4 (04/2023) . - p. 162-168 Titre : Development of nano bio aldehyde tanning agent for sustainable leather manufacture Type de document : texte imprimé Auteurs : Arjunan Yasothai, Auteur ; Gladstone Christopher Jayakumar, Auteur ; Angayarkanny Subramanian, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2023 Article en page(s) : p. 162-168 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage Aldéhydes Un aldéhyde est un composé organique, faisant partie de la famille des composés carbonylés, dont l'un des atomes de carbone primaire (relié au plus à 1 atome de carbone) de la chaîne carbonée porte un groupement carbonyle. L'aldéhyde le plus simple est le formaldéhyde (ou méthanal), aussi appelé formol lorsqu'il est en solution aqueuse. Un aldéhyde dérive formellement d'un alcool primaire (oxydation) dont le groupement hydroxyde -OH est en bout de chaîne et se forme suite à l'enlèvement de deux atomes H d'où le nom "alcool déshydrogéné" ou aldéhyde. Biopolymères Caractérisation Cuirs et peaux Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Essais dynamiques Morphologie (matériaux) Nanoparticules Post-tannage Stabilité hydrothermale Tannage organique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Exploring the application of natural biopolymers in leather manufacture is a need of the hour to achieve sustainability. The present research work explores the possibility of using modified biopolymer nanoparticles as a tanning agent. Starch, a polysaccharide with high functionalization, is converted into Nano Bio Aldehyde (NBA) through periodate oxidation as water-in-oil microemulsion method. The synthesized product was characterized by its physico-chemical nature. The prepared NBA shows an aldehyde content of 85%, which endorses its application as a tanning agent. Experimental leather trials were carried out to assess the tanning efficacy and found that NBA tanned leathers show a shrinkage temperature of 90°C. Physical characteristics of the experimental leathers were found to be 24 N/mm2 and 90 N for tensile and tear strength, respectively. The study provides a holistic understanding of modified biopolymer as a nano tanning agent to manufacture leather. Note de contenu : - MATERIALS AND METHODS : Materials - METHODS : Preparation of nanobioaldehyde particles - Characterization of the product NBA : Determination of aldehyde content - Fourier Transform Infrared (FTIR) analysis - Particle size analysis - Thermogravimetric analysis (TGA) - Differential Scanning Calorimetric (DSC) analysis - Preparation of DAS and NBA tanned leathers - Characterization of DAS and NBA tanned leathers hydrothermal stability measurement - Mechanical strength - Subjective evaluation of cprocessed leathers - Morphological evaluation - RESULTS AND DISCUSSION : Structural alterations in NBA - The morphological structure of SS and NBA - Characteristics of the prepared particles - Thermal properties of SS and NBA - Hydrothermal resistance of tanned leathers - Physical strength characteristics of the crust leathers - Subjective evaluation of the tanned crust leathers - Morphological structures of control and experimental tanned leathers - Table 1 : Experimental NBA tanning process - Table 2 : Post tanning process - Table 3 : Physical strength properties of control and experimental NBA tanned leather - Table 4 : Organoleptic properties of NBA tanned leather DOI : https://doi.org/10.34314/jalca.v118i4.7208 En ligne : https://drive.google.com/file/d/1Mx9yT5dde0Awk0tShiDIUvsrqIc5RIkt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39185 [article]

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Development of sustainable strategies for leather waste management through bacterial remediation / A. Sindhuja in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 12 (12/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 12 (12/2020) . - p. 454-458 Titre : Development of sustainable strategies for leather waste management through bacterial remediation Type de document : texte imprimé Auteurs : A. Sindhuja, Auteur ; C. Kurinjimalar, Auteur ; Gladstone Christopher Jayakumar, Auteur ; Arjunan Yasothai, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2020 Article en page(s) : p. 454-458 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries Biodégradation Caractérisation Cuir -- Déchets Cuirs et peaux -- Détérioration Enzymes microbiennes Hydroxyproline Peptidases Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new Bacillus species has been isolated and used for treating chrome leather wastes. The activity of Bacillus species is evaluated for the degradability of the Chrome Leather Waste (CLW). An initial CLW substrate concentration at 0.5 and 1%, along with the bacterial strain is studied against the control sample without bacterial strain. The higher proteolytic enzyme production and hydroxyproline release in the CLW containing medium confirms the degradation process, whereas it is significantly less in control samples. The degradation profile of CLW shows higher in 1% CLW as compared to 0.5% CLW. In 1% CLW, the protease activity of the isolated strain has been increased from 1.615 to 5.625 U/mL. In addition to protease activity, the isolated strain also expressed chromate reductase activity. Furthermore, FTIR, TGA, and SEM studies confirm the degradation of leather wastes. Note de contenu : - EXPERIMENTAL : Characterization of bacterial species - Evaluation of bacterial strain on chrome leather wases - ATR-FTIR of the chrome shavings - TGA of the chrome shavings - Microscope evaluation - Results and discussion - Fig. 1 : Phylogenetic tree of strain MG995009 - Fig. 2 : FT-IR spectra for treated and untreated samples, magnified image of chances in wave numbers of treated and untreated samples - Fig. 3 : Thermogravimetric analysis of treated and untreated CLW - Fig. 4 : SEM images of treated and untreated CLW of control and 0,5% - Table 1 : Release of protease during the degradation process of CLW - Table 2 : Release of hydroxyproline during the degradation process of CLW DOI : https://doi.org/10.34314/jalca.v115i12.4204 En ligne : https://drive.google.com/file/d/1ZyKTaiUdWrV-bpvWHu6TqCKAsLXwDUbR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34998 [article]

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Kinetics of inhibition of type I collagenase by dialdehyde cellulose in stabilization of type I collagen / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 3 (03/2015)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 3 (03/2015) . - p. 72-79 Titre : Kinetics of inhibition of type I collagenase by dialdehyde cellulose in stabilization of type I collagen Type de document : texte imprimé Auteurs : Gladstone Christopher Jayakumar, Auteur ; Nagarajan Usharani, Auteur ; Arjunan Yasothai, Auteur ; Swarna Vinodh Kanth, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2015 Article en page(s) : p. 72-79 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antienzymes Cellulose dialdéhyde Collagénases Les collagénases sont des enzymes capables de rompre les liaisons peptidiques du collagène. Elles facilitent la destruction des structures extracellulaires lors de la pathogenèse bactérienne. Ce sont des exotoxines. La production de collagénases peut être induite lors d'une réponse immunitaire, par les cytokines qui stimulent les cellules telles que les fibroblastes et les ostéoplastes et occasionnent indirectement des lésions tissulaires. Collagène -- Stabilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Collagen is one of the widely studied biomaterial for various industrial applications. However, search of eco-friendly and biocompatible stabilizing agent is a thrust research domain. In this research work, application of dialdehyde cellulose (DAC) was studied to understand the effect on the enzymatic and conformational stability in collagen. The secondary structure of collagen is not significantly altered on interaction with DAC. But, it was found that DAC lead to changes in the amplitude of the circular dichroic (CD) spectrum but did not alter the triple helical conformation of collagen. DAC treated collagen exhibited 93% resistance to collagenolytic hydrolysis. Conversely, DAC treated collagenase exhibited 89% inhibition against collagen degradation and the inhibition was found to be concentration dependent. The kinetics of inhibition of collagenase by DAC was derived from the extent of hydrolysis of (2-furanacryloyl-L-leucyl-glycyl-L-prolyl-L-alanine), FALGPA. DAC exhibited non-competitive mode of inhibition against collagenase. CD data on DAC-modified collagenase substantiate the hypothesis that the inhibition of collagenase by DAC arises from secondary and quaternary structural changes in the enzyme. Gaining new insights in understanding the mechanism of stabilization of collagen by DAC through kinetics of inhibition of collagenase was presented. Note de contenu : - MATERIALS AND METHODS : Materials - Methods - Preparation of DAC - Preparation of crosslinked collagen - Resistance to collagenase - Inhibition of collagenase activity - Kinetic investigation - Inhibition of collagenase by DAC - Conformational changes of DAC stabilized collagen - RESULTS AND DISCUSSION : Inhibition of collagenase - DAC treated collagenase resistance of native collagen - Conformational changes in DAC stabilized collagen - Conformational changes in DAC treated collagenase - Kinetic analysis of inhibition of collagenase by DAC - Mechanism of inhibition of collagenase by DAC En ligne : https://drive.google.com/file/d/1SE-oSDIEYjm4_Qrm6DaXeblWS7zipi-Z/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23452 [article]

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Phytoremediation of tannery wastewater treated lands : Part II : Using harvested Salicornia Brachiata plants for the preservation of sheepskins / P. Ramesh Kannan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 93, N° 6 (11-12/2009)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 93, N° 6 (11-12/2009) . - p. 240-244 Titre : Phytoremediation of tannery wastewater treated lands : Part II : Using harvested Salicornia Brachiata plants for the preservation of sheepskins Type de document : texte imprimé Auteurs : P. Ramesh Kannan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Swarna Vinodh Kanth, Auteur ; Arjunan Yasothai, Auteur ; S. Deepa, Auteur ; B. Chandrasekaran, Auteur Année de publication : 2009 Article en page(s) : p. 240-244 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, preservation of sheepskins using the harvested Salicornia brachiata from tannery wastewater treated lands was used as a replacement for salt in the curing process. Treatment of raw sheepskins using S. brachiata at a concentration of 10 % dry weight resulted in effective preservation at ambient temperature. The extractable nitrogen, content was found to be 3.42 mg/g at an optimized concentration of 10 % S. brachiata. Bacterial count, moisture content, shrinkage temperature, visual and physical properties of Salicornia brachiata preserved skins was comparable to that of conventional salt cured method. The antimicrobial metabolite available in the essential oils and the salt present in the plant has resulted in effective preservation of the skins. The quality of the plant preserved skins was found to be on par with that of salt cured skin. The quality of the resultant crust leathers prepared from S. brachiata preserved skins was found to be comparable with control leathers. En ligne : https://drive.google.com/file/d/1k9859CJ1N7WcoSgsdS8Wm0jF_k4ttZpK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7346 [article]

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Studies of the application of biocolorant for leather dyeing using Monascus Purpureus / A. Tamil Selvi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 4 (04/2018) . - p. 105-113 Titre : Studies of the application of biocolorant for leather dyeing using Monascus Purpureus Type de document : texte imprimé Auteurs : A. Tamil Selvi, Auteur ; Gladstone Christopher Jayakumar, Auteur ; N. Usha Rani, Auteur ; Arjunan Yasothai, Auteur Année de publication : 2018 Article en page(s) : p. 105-113 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie -- Essais et réactifs Colorants végétaux Cuirs et peaux -- Teinture Essais dynamiques Extraction (chimie) Fermentation Frottements (mécanique) pH Photostabilité Résistance à l'abrasion Rouge (couleur) Température vision des couleurs Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : World-wide requirement for colorants from natural origins have been rapidly increasing in the leather sector due to environmental effluent concerns. Biocolorant obtained from Monascus purpureus, which yields red colored extract, has been studied for the dyeing process of leather. The effect of varying conditions like pH, concentration, time and temperature on the levelness of the dyeing, shade brightness, color intensity and exhaustion of the dye have been studied herein, and the conditions optimized. The change in color shade obtained has been quantified by reflectance measurements and compared with the visual assessment data. The bulk properties viz., softness and grain smoothness have been found to be marginally improved, versus control, in biocolorant treated leathers. There is no significant change in strength properties by the use of these natural colorants in the post tanning process. Note de contenu : - EXPERIMENTAL : Reagents and chemical - Microorganism - Substrate and solid-state fermentation - Extraction of biocolorant - experimental trials - Effect of concentration (Trial 1) - Effect of pH (Trial 2) - Effect of temperature (Trial 3) - Effect of time (Trial 4) - Control process - Comparison of experimental and control trials - Analysis of dye exhaustion in the process liquor - Determination of color difference - Visual color assessment - Determination of fastness to light - Determination of fastness to wet and dry rub - Physical testing analysis - Assessment of bulk properties - RESULTS AND DISCUSSION : Biocolorant production - Natural colorant applied for dye exhaustion : influence of process parameters - Effect of concentration - Effect of pH - Effect of temperature - Effect of time - Effect of surface color at varied condition of biocolorant treatment - Optimized condition of biocolorant treatment Visual assessment of leathers - Light and rub fastness characteristics of leathers - Evaluation of strength characteristics - Assessment of bulk properties En ligne : https://drive.google.com/file/d/1YA5SIZB5vrTUmFlGbGwcF0-7MSrBXeTF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30339 [article]

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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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Studies on the use of enzymes in tanning process : Part I. High exhaust vegetable tanning / Swarna Vinodh Kanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 12 (12/2009)  

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