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 potency for mimosa, quebracho and essential oils of origanum species against acinetobacter pittii, klebsiella pneumoniae and bacillus cereus from diabetic foot patient / Didem Berber in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 6 (06/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 6 (06/2022) . - p. 232-240 Titre : Antibacterial potency for mimosa, quebracho and essential oils of origanum species against acinetobacter pittii, klebsiella pneumoniae and bacillus cereus from diabetic foot patient Type de document : texte imprimé Auteurs : Didem Berber, Auteur ; L. Inanc, Auteur ; Ipek Türkmenoglu, Auteur ; O. Toksöz, Auteur ; Nüzhet Cenk Sesal, Auteur Année de publication : 2022 Article en page(s) : p. 232-240 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antibactériens Diabète Extraits de plantes Extraits de plantes:Extraits (pharmacie) Huile essentielle d'origan Mimosa et constituants Quebracho Le quebracho est un arbre à écorce ligneuse, mesurant 30 mètres de haut, à feuilles tannées et à fleurs tubulées blanches. Quebracho est l'un des noms communs, en espagnol, d'au moins trois espèces similaires d'arbres originaires du Gran Chaco, en Amérique latine : Schinopsis lorentzii (quebracho colorado santiagueño), de la famille des Anacardiaceae ; Schinopsis balansae (quebracho colorado chaqueño), de la même famille ; Aspidosperma quebracho-blanco (quebracho blanc), de la famille des Apocynaceae. Ces trois espèces sont riches en tanin et fournissent un bois très dur, particulièrement résistant. Leur nom provient de l'espagnol quiebrahacha, qui signifie brise-hache. Statistique Index. décimale : 660.62 Microbiologie industrielle Résumé : The diabetic patients may sometime suffer from foot lesions, foot ulcers and amputation that adversely affect their quality of life. In this respect, good footwear has a critical significance for diabetic foot patients. The aim of this study to evaluate the potential efficacy of mimosa, quebracho, and essential oils of Origanum onites, Origanum onites oleum, and Origanum minutiflorum, against Acinetobacter pittii, Bacillus cereus, and Klebsiella pneumoniae, which was isolated from diabetic foot patient. According to our results, the mimosa extracts were slightly more efficient when compared to quebracho extracts to control the bacterial growth of A. pittii (8.77±0.58-35.12±8.41% inhibition for three doses), and K. pneumoniae (21.40±0.48-47.04±0.51% inhibition) except B. cereus (71.1±0.31-23.51±1.66% inhibition). But these inhibition percentages remained at lower levels. On the other hand, essential oil samples of O. onites, O. onites oleum, and O. minutiflorum at tested doses have considerably high antibacterial effects against A. pittii, B. cereus, and K. pneumoniae. The tested essential oils almost completely inhibited B. cereus with percentages of inhibition ranging from 96.18±2.98-100±0.00. Also, the bacterial growth of K. pneumoniae and A. pittii was inhibited by 88.01±2.36 to 100±0.00% and 71.42±12.57 to 100±0.00%, respectively. Moreover, the essential oils of O. onites, O. onites oleum, and O. minutiflorum, had bactericidal activity against A. pittii, and K. pneumoniae but bacteriostatic activity against B. cereus. This potency for essential oil of Origanum species may be evaluated for diabetic footwear. More detailed technical studies are required for the application of Origanum species to leather footwear. Note de contenu : - MATERIALS AND METHODS : Bacterial strain and test materials - Antibacterial tests - Statistical analyses - RESULTS AND DISCUSSION : Antibacterial efficacy of mimosa extracts against tested bacteria - Antibacterial efficacy of quebracho extracts against tested bacteria - Antibacterial efficacy of essential oils of O. onites, O. onites oleum, and O. minutiflorum - Statistical analyses DOI : https://doi.org/10.34314/jalca.v117i6.4964 En ligne : https://drive.google.com/file/d/1tkUAsnRyp1nzpjK77BOJP0MsQbPbfBEg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37798 [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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