Alternative and functional preservation from the lichen's secondary metabolite / Susan Paris in SOFW JOURNAL, Vol. 149, N° 3 (03/2023)  

[article]  inSOFW JOURNAL > Vol. 149, N° 3 (03/2023) . - p. 6-11 Titre : Alternative and functional preservation from the lichen's secondary metabolite Type de document : texte imprimé Auteurs : Susan Paris, Auteur Année de publication : 2023 Article en page(s) : p. 6-11 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens Antioxydants Biomolécules actives Ingrédients cosmétiques -- Suppression ou remplacement Lichens et constituants Métabolites Produits naturels Index. décimale : 668.5 Parfums et cosmétiques Résumé : One of the primary factors driving the shift and growth of the preservative market is the increasing choice for natural cosmetic products, as well as elevated levels of beauty consciousness among consumers. Natural antimicrobial innovations have continued to progress as customers seek alternatives to synthetic preservatives. Furthermore, the growing popularity of natural cosmetic products has driven preservation to become an integral component of the formulation process, focusing not only on quality but also on functionality. Preservation is no longer seen as the final phase in the formulation process, but rather as a need that may operate as multifunctional and offer cosmetic advantages to formulas. Active Micro Technologies has investigated the antimicrobial ability of the lichen Cladonia rangiferina as a broad-spectrum protection for cosmetic applications with good anionic system compliance. Featuring antioxidant capabilities, this active will also help protect your skin from internal and external stressors that may bring to premature aging. Note de contenu : - Lichens as a fascinting and inspiring complex life form - Secondary metabolites in lichens - "Reindeer lichen" as a source of usnic acid - Antimicrobial activity - Antioxidant activity - Reactive oxygen species scavenging assay En ligne : https://drive.google.com/file/d/184QvBBg_BkNA9-c6IsOqokGcdJJrb2V9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38936 [article]

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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 and anti–biofilm activities of acetone extracts of Usnea sp. against mixed cultures of bacteria from soak liquor samples and tank surfaces / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 10 (10/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 10 (10/2020) . - p. 365-372 Titre : Antibacterial and anti–biofilm activities of acetone extracts of Usnea sp. against mixed cultures of bacteria from soak liquor samples and tank surfaces Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; Ipek Türkmenoglu, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2020 Article en page(s) : p. 365-372 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. Antibactériens Biofilms Cuirs et peaux -- Conservation Lichens et constituants Peaux brutes -- Trempe Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Long-term or improper use of antibacterial agents utilized in the soaking process has led to the resistance of some bacteria in the leather industry. New agents may be the solution to combat these antibacterial resistant bacteria in the soaking process. As a natural resource, lichens are known to have many biological activities. In previous studies, we demonstrated that the acetone extracts of several lichen species including Usnea sp. may have potential antibacterial and anti–biofilm properties against some Bacillus species, which were isolated from different soak liquor samples. In the present study, it was questioned whether the same bioactivities of acetone extracts of Usnea sp. can be seen in the mixed cultures of tank surface samples and pre-and main soak liquor samples, which were obtained from different tanneries. Although the extracts did not show noteworthy antibacterial effect against one of the tank surface samples (inhibition ratios; 6.5–16.22 %), inhibition percentages were detected as 69.32 and 46.33 at the concentrations of 240 and 120 µg/mL for the other tank surface sample. The anti-biofilm potential of the extracts was tested on the sample where the antibacterial activity of the extracts was not observed. One of the mixed culture of samples from the tank surface could not be inhibited by the extracts in terms of bacterial growth. However, the extracts were tested on this biofilm-forming sample and detected more than 50% inhibition. Furthermore, the extracts inhibited the growth of the mixed culture of bacteria from pre-soak liquor by the percentages of 78.96, 61.5, 51.3, 45.1, and 33.4 at the concentrations of 240, 120, 60, 30 and 15 µg/mL, respectively. On the other hand, the same antibacterial efficacy could not be observed in the other mixed culture from pre-soak liquor sample obtained from a different tannery whereas this sample formed a biofilm structure. The mixed culture of samples from the main soaking process was inhibited by the extracts at the inhibition percentages of 62.13–78.17 at the concentrations of 240- 30 µg/mL. Similar results were also obtained for the other sample (64.6–76.5%) from main soak liquor sample obtained from a different tannery. In conclusion, lichen extracts may have potential antibacterial and anti-biofilm properties against the mixed culture of bacteria from tank surface, pre-and main soak liquor samples and maybe alternatively utilized in the leather industry. Note de contenu : - Lichen samples - Extraction of lichen samples - Samples - Antibacterial assays - Anti-biofilm assays DOI : https://doi.org/10.34314/jalca.v115i10.4174 En ligne : https://drive.google.com/file/d/1bymqwwbC7z2LVax6C5nzF0dCA1ucYOYl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34611 [article]

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Antibacterial properties of several lichen extracts against two moderately halophilic bacteria from salted sheepskins / Ipek Türkmenoglu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 4 (04/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 4 (04/2022) . - p. 153-163 Titre : Antibacterial properties of several lichen extracts against two moderately halophilic bacteria from salted sheepskins Type de document : texte imprimé Auteurs : Ipek Türkmenoglu, Auteur ; O. Toksöz, Auteur ; Didem Berber, Auteur ; Pinar Caglayan, Auteur ; Meral Birbir, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2022 Article en page(s) : p. 153-163 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Bactéries halophiles Cuirs et peaux de moutons Essais (technologie) Extraction (chimie) Extraits de plantes Lichens et constituants Statistique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It is well known that possible undesirable defects in finished leathers can result from microbial activities on the salted raw hides/skins during storage. The traditionally used salt curing method can control bacterial activities on the raw stock, but it does not seem possible to completely eliminate microbial attacks. Moderately halophilic bacteria can cause serious damage to hides/skins. From this point of view, potential procedures such as applying new antibacterial agents in the leather industry should be considered. Since some lichen species have been indicated for their promising biological efficacies in the literature; most researchers have focused on their potencies in various fields including leather industry from ancient times. In this study, the bacterial growth of proteolytic and lipolytic Gram-negative moderately halophilic bacteria, Chromohalobacter canadensis (YN6) and Halomonas eurihalina (BL5), from salted sheepskin samples were tested with the extracts of Usnea sp., Plastismatia glauca, Ramalina farinacea, Evernia divaricata, Bryoria capillaris, Hypogymnia tubulosa, Pseudevernia furfuracea and Lobaria pulmonaria. Some of these lichen species were found to be successful to inhibit the bacterial growth of C. canadensis (YN6) and H. eurihalina (BL5). In conclusion, lichen extracts may be utilized in stacked raw hides/skins in tanneries or warehouses to control moderately halophilic bacteria which causes several defects on leather. Note de contenu : - Moderately halophilic test bacteria - Lichen samples - Extraction of lichen samples - Antibacterial tests - Statistical analysis DOI : https://doi.org/10.34314/jalca.v117i4.4898 En ligne : https://drive.google.com/file/d/1JpK270mPD-iuFdcBl9PUzESigAqLbYrc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37562 [article]

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Efficacy of usnea sp. extracts in preventing biofilm formation by bacillus species isolated from soaking liquor samples / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 6 (06/2020) . - p. 222-229 Titre : Efficacy of usnea sp. extracts in preventing biofilm formation by bacillus species isolated from soaking liquor samples Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; Ipek Türkmenoglu, Auteur ; Meral Birbir, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2020 Article en page(s) : p. 222-229 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antimicrobiens Bactériologie Biofilms Cuirs et peaux -- Conservation Lichens et constituants Statistique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Bacteria forms biofilm to be resistant to antibacterial agents and other unfavorable environment as compared to planktonic bacterial cells. Due to resistance of bacterial biofilms to commonly used antimicrobial agents and adverse effects of these biofilms in different industries, potential natural compounds which can inhibit bacterial biofilms have attracted more attention in recent years. Lichens are known to have unique secondary metabolites with various biological activities including anti-biofilm properties. Therefore, Bacillus toyonensis, Bacillus mojavensis, Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus velezensis, Bacillus cereus, and Bacillus licheniformis, isolated from soak liquor samples in the previous study, were tested for their ability to form biofilm in this study. Biofilm-forming Bacillus species were detected as B. subtilis, B. amyloliquefaciens, and B. velezensis. The anti-biofilm effect of the acetone extracts of Usnea sp. was evaluated at various concentrations against these biofilm-forming isolates. The anti-biofilm effect of acetone extracts of Usnea sp. against B. subtilis and B. amyloliquefaciens was observed at the concentration of 5 µg/mL by inhibition ratios of 62.75% and 72.72%, respectively. In addition, biofilm formation of B. velezensis was inhibited by the treatment with 1.25 µg/mL extracts at a 62.69% inhibition rate. Biofilm formations of B. amyloliquefaciens and B. velezensis were also suppressed by the extracts at varying percentages of inhibition ranging between 10.11-43.69% and 21.25-46.35%, respectively. This study may provide an alternative approach to overcome the biofilm formation and bacterial resistance to the antibacterial agents in the leather industry. Note de contenu : - Lichen samples - Extraction of lichen samples - Bacterial strains - Screening of biofilm forming bacillus species from soak liquor samples - Anti-biofilm effect of Usnea sp. acetone extracts against B. subtilis, B. amyloloquefaciens, and B. velezensis - Statistical analyses DOI : https://doi.org/10.34314/jalca.v115i6.3820 En ligne : https://drive.google.com/file/d/1LpFnBpiI--C9xwpicxfMDPWnYNnYH8wf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34324 [article]

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Les lichens / Paul Ozenda / Paris : Masson (1970)

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The antibacterial power of lichens / Anna Maria Motta in GLOBAL PERSONAL CARE, Vol. 24, N° 9 (10/2023)  

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