Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent / C. Kurinjimalar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 9 (09/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 9 (09/2021) . - p. 322-331 Titre : Biocolorant for leather dyeing applications : an eco-benign evaluation of natural coloring agent Type de document : texte imprimé Auteurs : C. Kurinjimalar, Auteur ; Gladstone Christopher Jayakumar, Auteur ; A. Tamil Selvi, Auteur ; Rajangam Venba, Auteur ; Malathy Jawahar, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2021 Article en page(s) : p. 322-331 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse spectrale Caractérisation Colorants végétaux Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Teinture Extraction (chimie) Garance et constituants Granulométrie Solidité de la couleur Stabilité thermique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Exploration of biocolorant in leather industry is explored widely owing to its environmental limitation. Besides, employing synthetic dyes in leather process requires high end of pipe treatment due to their complex chemical structure. Therefore, an attempt has been made on exploiting madder root dye (Rubia cordifolia L.) for leather dyeing application. The effect of varying pretreatment regimen on madder colorant extraction, chemical characterizations (including UV-Vis, IR, particle size, zeta potential value, and thermal studies) and optimum operating leather dyeing conditions are studied. The results revealed dissolving medium pH 5, 100oC, and 60 min duration of extraction is optimum. Thus, obtained dye characteristics showed maximum absorption peak at 460 nm, with an average particle size of 166 nm. It also shows a negative zeta potential value of -5.31 which is indicative for dyeing application. The optimum leather dyeing is found at leather pH 5.5, 10% dye concentration and 4 h duration. At optimum dyeing parameters it shows good fastness, perspiration, organoleptic properties without affecting the physical characteristic. Novelty of the present research would lead to develop eco-dyeing method in leather manufacture. Moreover, the study unravels a new application of eco-benign dye to achieve sustainable process. Note de contenu : - Graphical abstract - MATERIALS AND METHODS : Materials - Optimization on madder dye extraction - Preparation and characterization of madder dye - Spectral characteristics - Thermal property analysis - Leather dyeing application and analysis - RESULTS AND DISCUSSION : Optimization on madder dye extraction - Spectral characteristic analysis - Particle size and stability analysis - Thermal stability analysis - Leather dyeing optimization trials - Effect of concentration (Trial 1) - Effect of pH (Trial 2) - Effect of time (Trial 3) - Effect of mordants (Trial 4) - Grain surface analysis - Characterization of dyed leather - Color fastness analysis - Organoleptic properties analysis - Table 1 : Post-tanning procedure for dyeing using madder dye - Table 2 : Color value analysis of crust leather dyed using madder dye - Table 3 : Organoleptic and fastness properties of crust leather dyed using madder dye DOI : https://doi.org/10.34314/jalca.v116i9.4397 En ligne : https://drive.google.com/file/d/1rlk3HayVEXpRVU8p3Wop0diFyOqa6Xfd/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36404 [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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