Biosorption of chromium from spent semi-chrome liquor : Part 1 - Effective pollution abatement using bacillus cerus / Saranya Kailasam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 11 (11/2021)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 11 (11/2021) . - p. 395-400 Titre : Biosorption of chromium from spent semi-chrome liquor : Part 1 - Effective pollution abatement using bacillus cerus Type de document : texte imprimé Auteurs : Saranya Kailasam, Auteur ; Kanimozhi Balaji, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2021 Article en page(s) : p. 395-400 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bacillus cerus Biosorption Caractérisation Chrome Concentration minimale inhibitrice (antimicrobiens) En microbiologie, la concentration minimale inhibitrice (CMI) est la plus faible concentration d'un produit chimique, généralement un médicament, qui empêche la croissance visible d'une ou de plusieurs bactéries. La CMI dépend du micro-organisme considéré, de l'être humain affecté (in vivo uniquement) et de l'antibiotique lui-même. La CMI est déterminée en préparant des solutions du produit chimique in vitro à diverses concentrations croissantes, en incubant les solutions avec des groupes séparés de bactéries en culture et en mesurant les résultats en utilisant une méthode de dilution standardisée (agar ou microdilution). Les résultats se classent ensuite comme "sensible", "intermédiaire" ou "résistant" à un antimicrobien particulier en utilisant un point d'arrêt. Les points d'arrêt sont des valeurs convenues, publiées dans les directives d'un organisme de référence, comme le US Clinical and Laboratory Standards Institute (CLSI), la British Society for Antimicrobial Chemotherapy (BSAC) ou le Comité européen sur les tests de sensibilité aux antimicrobiens (EUCAST). On a pu constater des écarts importants au niveau des points d'arrêt de divers pays européens au fil des ans, et entre ceux de l'EUCAST et du CLSI. Alors que la CMI est la concentration la plus faible d'un agent antibactérien nécessaire pour inhiber la croissance visible, la concentration bactéricide minimale (CBM) est la concentration minimale d'un agent antibactérien qui entraîne la mort bactérienne. Plus la CMI est proche de la CBM, plus le composé est bactéricide. La première étape de la découverte d'un médicament est souvent le dépistage d'un médicament candidat de banque de données pour les CMI contre les bactéries d'intérêt. En tant que tels, les CMI sont généralement le point de départ pour de plus grandes évaluations précliniques de nouveaux agents antimicrobiens. Le but de la mesure de la concentration minimale inhibitrice est de s'assurer que les antibiotiques sont choisis efficacement pour augmenter le succès du traitement. (Wikipedia) Déchets -- Elimination Déchets industriels -- Elimination Eaux usées -- Décontamination Eaux usées -- Epuration Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The current study focuses on the isolation of Bacillus cerus from mangrove rhizosphere and its ability to treat semi-chrome process liquor of upper leathers. This strain has been identified by its molecular characteristics (16s rRNA sequencing) and confirmation has been obtained from neighbor joining tree. Minimum inhibitory concentration of the strain has been found to be 50 ppm. The growth pattern of this organism has been investigated in the presence of chromium, which showed the bacterial strain can grow luxuriantly at 50 and 100 ppm concentration of chromium. Biosorption study has been conducted at different concentrations (50, 100, 150, 200 and 250 ppm) of chromium. The biosorption capability of Bacillus cerus has been found to be 80.78, 73.19, 65.86, 59.44 and 39.27% for 50, 100, 150, 200 and 250 ppm respectively. Chromium sorption from the semi-chrome process liquor by Bacillus cerus has also been investigated, which showed a reduction of 76.15, 68.56, 61.63, 56.29 and 36.51% against 50, 100, 150, 200 and 250 ppm of chromium. Sorption characterization has been carried out by FTIR (Fourier Transform Infra-Red spectroscopy) and SEM (Scanning Electron Microscopy) analyses and the results confirmed the presence of sorption of chromium in Bacillus cerus. Note de contenu : - Collection of effluent - Isolation and identification of chromium resistant bacteria - Minimum inhibitory concentration - Bacterial growth evaluation - Biosorption analysis - Characterization - Table 1 : Characteristics of spent semi-chrome liquor - Table 2 : IR peaks of responsible functional groups involved in biosorption DOI : https://doi.org/10.34314/jalca.v116i11.4662 En ligne : https://drive.google.com/file/d/1Nwxg6_nFzdNHh0LqL7Lrdz89rxJ0UKYv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36577 [article]

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Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) . - p. 55-63 Titre : Sustainable finished leather preservation : Part I - Myrobalan capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Article en page(s) : p. 55-63 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Cuirs et peaux -- Conservation Cuirs et peaux -- Finition Cuivre Formulation (Génie chimique) Myrobalan et constituants Nanoparticules Nanoparticules -- Synthèse Produits de conservation du cuir Réduction (chimie) Revêtements Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Copper nanoparticles were synthesized using myrobalan (tannin) extract as a reducing agent. The synthesized nanoparticles were used in the coating of leather after the finishing process of upper leather to enhance the antimicrobial properties of leather. Primarily, the synthesized myrobalan copper nanoparticles (M-CuNPs) were characterized using UV-Spectroscopy (UV), which resulted in an absorption peak at 412 nm, confirming the presence of CuNPs in the solution. The size distribution and zeta potential values of M-CuNPs were analyzed by Dynamic Light Scattering (DLS) which resulted in an average particle size of 104 nm and zeta potential value of -28mv. These values affirm the stability of the M-CuNPs. Scanning Electron Microscope (SEM) image showed that the particles are spherical in shape. The elemental composition of M-CuNPs was confirmed using Energy dispersive X-ray (EDX) studies. Fourier transform infrared (FTIR) spectra showed peaks at 3173 cm-1, 1727 cm-1, 1147 cm-1, and 624 cm-1, which correspond to -OH, C=O, C-O, and C-H respectively confirming functional groups involved in the synthesis and capping process. The antibacterial activity of the M-CuNPs coated finished leather was evaluated against Grampositive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria, which are common pathogenic species that effect the preservation capabilities of the leather. The M-CuNPs coated finished leather exhibits strong antimicrobial activity against both Gram-positive (Bacillus subtilis) and Gram-negative (Serratia marcescens) bacteria. Hence from the above study, M-CuNPs can be used as a sustainable antibacterial agent for preserving leather and its products. Note de contenu : - MATERIALS AND METHOD : Materials - Preparation of tannin extraction - Synthesis of M-CuNPs - Characteristics of M-CuNPs - Methodology of leather nanocoatings - Antibacteial assay of M-CuNPs - Effect of copper nanoparticles on growth of bacteria - Antibacterial evaluation of M-CuNPs coated leather - RESULTS AND DISCUSSION : Antibacterial activity of M-CuNPs - Antibacterial mechanism of copper nanoparticles - Table 1 : Resin finish formulation - Table 2 : Antibacterial activity of the synthesized M-CuNPs DOI : https://doi.org/10.34314/jalca.v119i2.8322 En ligne : https://drive.google.com/file/d/1Sj4vOJh9ztiOGhfz1DgCXCot8I0WENEA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40465 [article]

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Sustainable finished leather preservation / Ruby Shekinah in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 2 (02/2024)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 2 (02/2024) Titre : Sustainable finished leather preservation : Part II - Wattle tannin capped copper nanoparticles Type de document : texte imprimé Auteurs : Ruby Shekinah, Auteur ; Saranya Kailasam, Auteur ; Sujata Mandal, Auteur ; Swarna Vinodh Kanth, Auteur Année de publication : 2024 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acacia et constituants Antibactériens Caractérisation Cuirs et peaux -- Conservation Cuivre Extraction (chimie) Nanoparticules -- Synthèse Produits de conservation du cuir Tanins végétaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Part 1 of the current paper described the green synthesis of myrobalan capped copper nanoparticles for the preservation of the finished leather. In Part II of the current study, Copper Nanoparticles (CuNPs) were synthesized using green synthesis with wattle (tannin) extract as a reducing agent. Green synthesis is the preferred approach for the synthesis of metal nanoparticles due to its eco-friendly and cost-effectiveness for the preservation of finished leather. To improve the antibacterial qualities of leather with different types of finishes, the resin finished leather was coated with synthesized wattle copper nanoparticles (W-CuNPs). The chemical constituents of wattle induce the reduction of Cu2+ ions to CuNPs with the capping process and also remain as a stabilizing agent for the capping process. The formation of W-CuNPs was confirmed by UV-Spectroscopy at an absorbance of 467 nm. The identified functional groups such as -OH, C=C, and C-N were analyzed by Fourier transform infrared spectrum (FT-IR) which are responsible for the reduction and stabilization of copper nanoparticles. The spherical shape of the nanoparticles was ascertained by Scanning Electron Microscope (SEM), whereas Energy dispersive X-ray (EDX) studies confirmed the presence of copper with 65%. The average particle size of W-CuNPs was found to be 96 nm. The zeta potential value of -24 mv affirmed the stability of the W-CuNPs. The maximum zone of inhibition was 12 mm against Gram-positive (Bacillus subtilis) and 11 mm against Gram-negative (Serratia marcescens) bacteria on W-CuNPs coated finished leather, which exhibits strong antimicrobial activity. Hence, CuNPs synthesized by wattle extract have the potential to preserve the finished leather and its products as an antibacterial agent. Note de contenu : - MATERIALS AND METHODS : Preparation of tannin extraction - Synthesis of W-CuNPs - Characterization of W-CuNPs - Methodology of leather nanocoatings - Antibacterial assay of W-CuNPs and W-CuNPs coated leather - Effect of copper nanoparticles on growth of bacteria - RESULTS AND DISCUSSION : UV-visible spectroscopy of w-CuNPs - Particle size distribution of W-CuNPs - Functional group analysis of W-CuNPs - Morphology and size of W-CuNPs - Antibacterial activity of W-CuNPs - Table 1 : Antibacterial activity of the synthesized W-CuNPs DOI : https://doi.org/10.34314/jalca.v119i2.8323 En ligne : https://drive.google.com/file/d/1HvhiGDIyGSW4y29rKyK9k40TsJzHnT_O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40466 [article]

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