Antibacterial activities of lichen derived extracts against different bacillus species from soak liquor samples / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 3 (03/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 3 (03/2020) . - p. 96-104 Titre : Antibacterial activities of lichen derived extracts against different bacillus species from soak liquor samples Type de document : texte imprimé Auteurs : Didem Berber, Auteur Année de publication : 2020 Article en page(s) : p. 96-104 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Bactéries à gram positif Bain de trempe Chimie analytique 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) Extraction (chimie) Lichens et constituants Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the leather industry, some bacterial strains may become resistant to antibacterial agents utilized in the soaking process due to long-term use and/or not using in sufficient doses. Alternative approaches or novel agents need to be investigated to overcome antibacterial resistance of bacteria present in the soaking process. These alternative approaches may be from natural resources such as lichens which are known to have various biological activities such as antibacterial, antifungal etc. For this purpose, soak liquor samples from different tanneries were collected and eight isolates from these samples were identified by cultural and molecular techniques. Also, the antibacterial effects of acetone extracts of Hypogymnia physodes, Evernia divaricata, Pseudevernia furfuracea and Usnea sp. at different concentrations were tested on these isolates. They were all Gram (+), rod shaped, oxidase (+), catalase (+), protease (+). Six isolates had lipase activities. The isolates were assigned to Bacillus toyonensis, B. mojavensis, B. subtilis, B. amyloliquefaciens, B. velezensis, B. cereus, and B. licheniformis in molecular analyses. The acetone extracts of Evernia divaricata totally killed B. toyonensis, B. mojavensis, B. amyloliquefaciens, and B. subtilis at the concentrations of 240, 120, 60 and 30 µg/ml, respectively. These extracts had also significant antibacterial efficacies on B. cereus, B. velezensis, B. licheniformis at the concentration of 240 µg/ml. The acetone extracts of P. furfuracea had a great inhibitory effect on the growth of most species (80.24-88.65%) only at the concentration of 240 µg/ml. H. physodes acetone extracts totally killed B. amyloliquefaciens and had considerably high suppressive effect on the growth of other tested bacteria at the concentrations of 120 and 240 µg/ml. Usnea sp. acetone extracts had inhibitory effect on Bacillus species (86.6-97.9%) even at the 30 µg/ml concentration. In this respect, lichens may provide an alternative approach for the leather industry to overcome bacterial resistance to the antibacterial agents. Note de contenu : - Bacterial strains - Gram staining, oxidase-catalase tests and selective media - Protease and lipase activity - Molecular analyses - Lichen samples - Extraction of lichen samples - Minimum inhibitory concentration (MIC) - Table I : Isolate codes, closest relatives similarities, gram staining, oxidase and catalase tests, bacterial growth on selective media, protease and lipase activity results of eight isolates collected from soak liquor samples of different tanneries - Table II : The percentage of bacterial growth inhibition for tested lichen extracts DOI : https://doi.org/10.34314/jalca.v115i03.1627 En ligne : https://drive.google.com/file/d/143LDbTUNPjhNUoR1_307Trtl8RzJTLj_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33887 [article]

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Antibacterial activity of sophorolipids produced by Candida bombicola on Gram-positive and Gram-negative bacteria isolated from salted hides / Daniel K. Y. Solaiman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 10 (10/2016)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXI, N° 10 (10/2016) . - p. 358-364 Titre : Antibacterial activity of sophorolipids produced by Candida bombicola on Gram-positive and Gram-negative bacteria isolated from salted hides Type de document : texte imprimé Auteurs : Daniel K. Y. Solaiman, Auteur ; Richard Ashby, Auteur ; Meral Birbir, Auteur ; Pinar Caglayan, Auteur Année de publication : 2016 Article en page(s) : p. 358-364 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Bactéries à gram négatif Bactéries à gram positif Candida Cuirs et peaux -- Conservation Glycolipides Sophorolipides Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salted hides and soaked hides treated with certain antibacterial agents, may still contain different proteolytic and lipolytic Gram-positive and Gram-negative bacteria that affect the quality of leather adversely. The prevalence of bacteria resistant to antimicrobial agents in the leather industry has drawn attention of scientists to search new and effective antimicrobial agents. Examination of antimicrobial glycolipids such as sophorolipids for their effectiveness against proteolytic and lipolytic hide-degrading microorganisms, may offer important information. Hence, we describe a research that evaluates the susceptibility of various hide-degrading bacteria to sophorolipids. These extracellular glycolipids were produced by fermentation using Candida bombicola ATCC 22214. Palmitic acid, stearic acid, and oleic acid were used respectively to produce SL-p, SL-s, and SL-o. The minimal inhibitory concentrations (MICs) of SL-p, SL-s, and SL-o against Gram-positive endospore-forming bacteria (Bacillus licheniformis, B. pumilus and B. mycoides), Gram-positive bacteria (Enterococcus faecium, Aerococcus viridans, Staphylococcus xylosus, S. cohnii and S. equorum), Gram-negative bacteria (Pseudomonas luteola, Enterobacter cloacae, E. sakazakii and Vibrio fluvialis), and mixed culture of these isolates were examined using an agar dilution method. The MICs of both SL-p and SL-o against the test bacteria were determined as 19.5 µg/mL, with an exception that E. cloacae was inhibited by SL-o at a MIC of 9.76 µg/mL. Although MICs of SL-p did not change against the test bacteria, the MICs of SL-s (ranging from 4.88 µg/mL to 19.5 µg/mL) changed according to species of the test bacteria. The lowest MICs of SL-s were found to be 4.88 µg/mL against B. licheniformis, B. pumilus, P. luteola, S. xylosus and B. mycoides. The MICs of SL-p, SL-s, and SL-o against the mixed bacterial culture were detected as the same (19.5 µg/mL). In conclusion, SL-p, SL-s, and SL-o inhibited the growth of 12 different hide bacteria and their mixed culture, and have broad-spectrum activity. The results obtained in the present study may be valuable for the development of SL-p, SL-s, and SL-o as antimicrobial surfactants in the preservation and soaking processes of hides and skins. Note de contenu : - Test microorganisms - Production of sophorolipids - Agar dilution method En ligne : https://drive.google.com/file/d/1_1T2en2bjAvf3Fync8UPQ5O5QWMSRfdx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27021 [article]

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A biodegradable, broad-spectrum antibacterial / Anna Gripp in GLOBAL PERSONAL CARE, Vol. 23, N° 2 (02/2022)  

[article]  inGLOBAL PERSONAL CARE > Vol. 23, N° 2 (02/2022) . - p. 39-40 Titre : A biodegradable, broad-spectrum antibacterial Type de document : texte imprimé Auteurs : Anna Gripp, Auteur ; Christine Abbastante, Auteur Année de publication : 2022 Article en page(s) : p. 39-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Bactéries à gram négatif Bactéries à gram positif Chlorure de cétylpyridinium Conservateurs (chimie) Déodorants Formulation (Génie chimique) Peau -- Soins et hygiène Index. décimale : 668.5 Parfums et cosmétiques Résumé : When it comes to formulating personal care products, it is critical to select the most effective anti-bacterial agent. Especially when it comes to preservation, no single preservative is equally effective against all types of microorganisms. Cetylpyridinium chloride (CPC, Figure 1) is a quaternary ammonium compound that a literature search shows to be biodegradable and which offers effectiveness against many organisms. In the US, it may be used as a preservative and the FDA lists it as an antimicrobial agent. Outside the US, it may be used as an antibacterial agent. CPC has also been used widely in in over-the-counter products including mouthwash, throat lozenges, generally at 0.1-0.2%, nasal sprays and antiseptic (first aid) creams and lotions. Vertellus offers CPC in two forms : powder and liquid. The trade name for the liquid form is ‘Freshstatâ„¢ Cetylpyridinium Chloride’ and it is a 40% CPC in propylene glycol solution. This form provides formulation ease and production flexibility. Our CPC is made in the USA, comes in US and European Pharmacopeia forms, and also in technical grades. Based on common knowledge of commonly used preservatives, Table 1 compares a 40% CPC solution in propylene glycol to a variety of commonly used preservatives, i.e. methylparaben, ethyl paraben, propylparaben, butylparaben, phenoxyethanol, imidazolidinyl urea and chlorphenesin. This shows that CPC is effective over a broad pH range and exhibits broad anti-microbial efficacy against grampositive and gram-negative bacteria, broad spectrum activity, where the others have activity against fewer of these microorganisms. Note de contenu : - Anti-microbial activity - Formulation guidelines - Deodorants - Fig. 1 : Structure of CPC - Fig. 2 : Bacteria reduction in deodorant formulations - Table 1 : CPC microorganism activity - Table 2 : Log reduction of bacteria using CPC - Table 3 : Deodorant 'gel stick' formula - Table 4 : Deodorant 'Waffle top gel' formula En ligne : https://drive.google.com/file/d/1wogOVkoasJ__dHbFgBMfFU-Sm7xAnP_e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37232 [article]

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Examination of gram positive bacteria on salt-pack cured hides / Emel Aslan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 12 (12/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 12 (12/2011) . - p. 372-380 Titre : Examination of gram positive bacteria on salt-pack cured hides Type de document : texte imprimé Auteurs : Emel Aslan, Auteur ; Meral Birbir, Auteur Année de publication : 2011 Article en page(s) : p. 372-380 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Identification Bactéries à gram positif Cuir -- Séchage Cuirs et peaux -- Conservation Sels Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt-pack curing method has been a widely used hide preservation method in worldwide. In order to evaluate the efficiency of the salt-pack curing process on the hides, Gram-positive bacteria on the hides were characterized and their proteolytic and lipolytic activities were examined. Salt-pack cured hides examined were collected from different tanneries in Leather Organized Tannery Region, Tuzla-Istanbul, Turkiye and 40% of the hides were imported from abroad. A total of 396 Gram-positive bacteria comprising from 12 different genera (Aerococcus, Aneurinibacillus, Bacillus, Brevibacillus, Enterococcus, Geobacillus, Kocuira, Lactococcus, Paenibacillus, Streptococcus, Staphylococcus and Virgibacillus) and 47 bacterial species were isolated and identified from the hides. The total numbers of proteolytic, lipolytic and both proteolytic and lipolytic isolates on the hides were found as 278, 274 and 226, respectively. The most common Gram-positive genera on the salted hides were Staphylococcus (115 isolates), Bacillus (111 isolates) and Enterococcus (75 isolates). Bacillus and Staphylococcus isolates showed both proteolytic and lipolytic activities in the highest number on the hides. The results verified that the salt-pack curing method was not efficient in preserving the raw cattle hides. As a conclusion, since the salt-pack curing method were not applied adequately, a wide variety of Gram- positive bacterial species were isolated from the salt-pack cured hides. Therefore, the salt-pack curing method should be modified to inactivate Gram-positive bacteria found on the salt-pack cured hide samples. Note de contenu : - Isolation and identification of bacillus species - Isolation and identification of staphylococcus species - Isolation and identification of streptococcus species - Determination of protease activity - Determination of lipase activity En ligne : https://drive.google.com/file/d/1KVVhLVSXGM7Y0Vq79QXH3Mnxkj_ghKxD/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12899 [article]

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Studies on the influence of certain hide constituents on growth and chromogenesis of sarcina sp. / K. Padmini in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXX (Année 1975)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXX (Année 1975) . - p. 397-402 Titre : Studies on the influence of certain hide constituents on growth and chromogenesis of sarcina sp. Type de document : texte imprimé Auteurs : K. Padmini, Auteur ; R. Bhaskaran, Auteur ; V. S. Krishnamurthi, Auteur Année de publication : 1975 Article en page(s) : p. 397-402 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bactéries -- Croissance Bactéries à gram positif Chromogenèse Cuirs et peaux -- Dégraissage Cuirs et peaux de bovins Pigments bactériens Sarcina litoralis Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hide extract containing salt-soluble interfibrillary substances was found to influence the growth and pigment production of a halophilic strain of Sarcina litoralis isolated from wet-salted goat skins. At 20 percent sodium chloride concentration, growth was inhibited in the basal medium but the addition of bide extract enhanced growth and pigmentation. The removal of fat from the hide extract affected growth and pigmentation significantly. Note de contenu : - EXPERIMENTAL : Preparation of extract and fat-free extract of cow and buffalo hides - RESULTS : Effect of hide extract on the growth and pigmentation of S. litoralis - Effect of fat-free hide extract on growth and pigmentation of S. litoralis - Table 1 : Pigment per standard turbidity - Fig. 1 : Effect of hide extract on the growth and pigmentation of S. litoralis En ligne : https://drive.google.com/file/d/1Hrqtrv7ydwEnDaZFl21mUJQNi3qjRnCU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38791 [article]

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