Bioprospecting highly diverse endophytic Pestalotiopsis spp. with antibacterial properties from Maytenus ilicifolia, a medicinal plant from Brazil

2007 ◽  
Vol 53 (10) ◽  
pp. 1123-1132 ◽  
Author(s):  
Josiane Gomes-Figueiredo ◽  
Ida C. Pimentel ◽  
Vânia A. Vicente ◽  
Marcio R. Pie ◽  
Vanessa Kava-Cordeiro ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Medicinal Plant ◽  
Micrococcus Luteus ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
New Approach ◽  
Pestalotiopsis Microspora ◽  
Layer Chromatography ◽  
Maytenus Ilicifolia ◽  
Overlay Assay

Thirteen endophytic fungal strains of the genus Pestalotiopsis were isolated from the medicinal plant Maytenus ilicifolia Mart. ex. Reiss (commonly known as “espinheira santa”) and their antimicrobial properties were investigated. Two isolates were successful in inhibiting the growth of the tested microorganisms ( Escherichia coli , Klebsiella pneumoniae , Micrococcus luteus , Staphylococcus aureus , and methicillin-resistant Staphylococcus aureus (MRSA)) using the technique of bioautographic thin-layer chromatography (TLC) agar overlay assay. An analysis based on a polyphasic approach integrating taxonomic information, morphological traits, RAPD markers, and the sequencing of the ITS1–5.8S–ITS2 of the rDNA led to the assignment of the isolates as belonging to the species Pestalotiopsis microspora , Pestalotiopsis vismiae , and Pestalotiopsis leucothoes . Therefore, the present study presents a new approach to the study of endophytic fungi of the genus Pestalotiopsis.

Barrier and Antibacterial Properties of 2-Octyl Cyanoacrylate-Derived Wound Treatment Films

2003 ◽  
Vol 7 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Patricia M. Mertz ◽  
Stephen C. Davis ◽  
Alejandro L. Cazzaniga ◽  
Anna Drosou ◽  
William H. Eaglstein
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacterial Contamination ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Bacterial Invasion ◽  
Wound Treatment ◽  
Antimicrobial Study ◽  
And Control ◽  
Number Of Bacteria

Background: Besides enhancing healing, an ideal dressing should prevent invasion of pathogens and control the number of bacteria already present in the wounds. Objective: To evaluate the barrier and antimicrobial properties of a cyanoacrylate-based bandage (LAB) against Staphylococcus aureus or Pseudomonas aeruginosa on partial thickness wounds in swines. Methods: Barrier study: Bacteria were inoculated over test materials (LAB, standard bandage, air-exposed) that were placed over wounds. The bacteria from wounds were quantitated at 24, 48, and 72 hours postinoculation. Antimicrobial study: Wounds inoculated with bacteria were covered with LAB, standard bandage, or hydrocolloid bandage or left air-exposed. The bacteria recovered from wounds were quantitated at 24 and 72 hours after treatment. Results: Barrier study: No bacteria were recovered from LAB-treated wounds. Antimicrobial study: LAB reduced the number of inoculated bacteria in comparison to all other groups. Conclusion: LAB is effective in protecting wounds from external bacterial invasion and reducing bacterial contamination.

UJI EFEKTIVITAS ANTIBAKTERI ESKTRAK ETIL ASETAT BAWANG DAYAK (Eleutherine palmifolia Merr) TERHADAP STAPHYLOCOCCUS AUREUS DENGAN METODE SUMURAN

2020 ◽  
Vol 5 (2) ◽  
pp. 174
Author(s):  
Fitriyanti Fitriyanti ◽  
Abdurrazaq Abdurrazaq ◽  
Muhammad Nazarudin
Keyword(s):  
Staphylococcus Aureus ◽  
Medicinal Plant ◽  
Ethyl Acetate ◽  
Ethyl Acetate Extract ◽  
Antibacterial Properties ◽  
Inhibition Zone ◽  
Effective Concentration ◽  
Minimum Effective Concentration ◽  
Mueller Hinton ◽  
Mueller Hinton Agar

Dayak onion (Eleutherine palmifolia Merr.) is a multifunctional medicinal plant for various diseases, one of which is an antibacterial. Dayak Onions (E. palmifolia Merr.) contains an alkaloid, flavonoid, triterpenoid, and saponin compound which has antibacterial properties. This study aims to determine the effect of the ethyl acetate extract of Dayak Onion tubers inhibits the growth of Staphylococcus aureus bacteria. Dayak onion tuber was extracted using ethyl acetate solvent by the maceration method until thick extract was obtained. The concentration extract used were 30 mg/ml;15 mg/ml;7,5 mg/ml;3,75 mg/ml; 1,875 mg/ml; and 0,9375 mg/ml tested for antibacterial effectivity against Staphylococcus aureus using Mueller Hinton Agar (MHA) with the wells method. The result showed that the ethyl acetate of Dayak onion with MEC (Minimum effective concentration) 3,75 mg/ml obtained inhibition zone of 10,367 mm while at the highest concentration of 30 mg/ml had the best antibacterial effectiveness. The effective concentration of ethyl acetate onion of Dayak tuber which is 30 mg/ml obtained inhibition zone of 18,404 mm even in the moderate category.

scholarly journals Antibacterial properties of a biologically active composite based on glauconite

2021 ◽  
Vol 21 (1) ◽  
pp. 62-71
Author(s):  
Sergei B. Venig ◽  
◽  
Rimma K. Chernova ◽  
Victor G. Sergeantov ◽  
Tatyana Yu. Rusanova ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pharmaceutical Preparation ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Animal Husbandry ◽  
Biologically Active ◽  
Natural Aluminosilicate ◽  
Urgent Task ◽  
Poultry Farming

Glauconite, a natural aluminosilicate, exhibits good sorption properties, is an affordable, cheap material, and has the prospect of being used in construction, ecology, medicine, cosmetology, animal husbandry, poultry farming, agriculture, etc. An urgent task is to study the sorption activity of glauconite in the Beloozersky deposit in the Saratov region in relation to biologically active substances for the creation of antimicrobial composites. The elemental composition and surface morphology of glauconite grains are determined. The sorption capacity of glauconite with respect to the pharmaceutical preparation rivanol based on acridine dye and the degree of its extraction from aqueous solutions were determined by spectrophotometry. A composite was obtained by sorption immobilization and analyzed for antimicrobial activity in relation to the standard strains of Staphylococcus aureus ATCC 6538 P and Escherichia coli ATCC 25922. An improvement in the antimicrobial properties of the immobilized preparation was revealed in comparison with an aqueous solution. The best effect of the composite in relation to Staphylococcus aureus ATCC 6538 P was determined compared to Escherichia coli ATCC 25922. The results of these studies can find practical application in veterinary medicine, poultry farming, agriculture, medicine, etc.

scholarly journals Isolation of rare Genera of actinomycetes — antibiotic producers from soils using Aloe Arborescens juice

2022 ◽  
Vol 66 (9-10) ◽  
pp. 4-11
Author(s):  
O. N. Sineva
Keyword(s):  
Staphylococcus Aureus ◽  
Podzolic Soil ◽  
Micrococcus Luteus ◽  
Growth Stimulation ◽  
Antibiotic Activity ◽  
Phylogenetic Position ◽  
Genus Streptomyces ◽  
New Antibiotics ◽  
Aloe Arborescens ◽  
Layer Chromatography

The search for new antibiotics is an urgent problem due to the spread of resistance to existing antibacterial drugs in pathogenic microorganisms. Actinomycetes are producers of a large number of antibiotics used in medicine. Most antibiotics are isolated from actinomycetes of the Streptomyces genus, while rare genera of actinomycetes can be the producers of new antibiotics.The aim of the study is to investigate the effect of the biological substances complex present in aloe juice on the growth stimulation of rare genera of actinomycetes.Material and methods. Objects: samples of sod-podzolic soil and chernozem. The standard method of sowing soil suspensions on oat agar and Gause medium No. 2 was used to isolate actinomycetes. Chemotaxonomic properties were determined using the methods of ascending thin-layer chromatography on a cellulose layer. The generic identity of cultures was determined using Bergey’s manual and materials comparing the composition of cell walls of actinobacteria. DNA PCR with standard 27f and 1492r primers, as well as Sanger sequencing, were performed to study genosystematic features. Antibiotic activity was determined against the test microorganisms: Staphylococcus aureus ИНА 00985 (FDA 209P), Staphylococcus aureus ИНА 00761 (MRSA), Staphylococcus aureus ИНА 00762 (УФ- 2), Micrococcus luteus ATCC 9341, Bacillus subtilis ATCC 6633, Escherichia coli ATCC 25922, Pseudomonas aeruginosa ATCC 27853, Saccharomyces cerevisiae ИНА 01042.Results. A total of 527 actinomycete cultures were isolated from samples of sod-podzolic soil and chernozem with the addition of aloe juice; their phylogenetic position was determined. The dominant actinomycetes in the studied soil samples are the representatives of the genus Streptomyces. Bacteria of the genus Micromonospora take the second place by the number of isolated cultures. Rare genera of actinomycetes have also been identified: Nonomuraea, Streptosporangium, Nocardia, Actinomadura, Actinocorallia, Pseudonocardia, Amycolatopsis, Saccharomonospora, Saccharopolyspora, Promicromonospora, Kribbella. It was determined that the isolated cultures possess antibiotic activity against test microorganisms.Conclusion. It is advisable to use aloe juice after subjecting the leaves to biostimulation to isolate actinomycetes from the soil and identify their biodiversity.

scholarly journals HONEY AS A THERAPEUTIC AGENT, AN INSIGHT INTO ITS ANTIMICROBIAL PROPERTIES.

2020 ◽  
Author(s):  
FOSU ASARE
Keyword(s):  
Staphylococcus Aureus ◽  
Bacterial Infections ◽  
Therapeutic Agent ◽  
Methicillin Resistant Staphylococcus Aureus ◽  
Close Association ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Medical Practitioners ◽  
Ancient Times ◽  
Insight Into

Traditionally, honey has been used as both food and medicine since ancient times worldwide. Due to its nutritious content and sweet flavor, honey has been in great demand worldwide with China being the leading producer. People apply honey on the wound without having any knowledge of its antibacterial properties. Honey has proven to contain some antibacterial properties such as hydrogen peroxide, acidity, low moisture content, pH, etc. Bacteria are ubiquitous and their life has a close association with humans in their diet, food processing, etc. Some bacteria eg Staphylococcus aureus, consist of the normal flora of humans making them partially harmless but some can be harmful and in turn cause infections. Clinically, antibiotics such as tetracycline, penicillin, amoxicillin lincomycin, etc. have been used in the treatment of bacterial infections but some bacteria eg Methicillin Resistant Staphylococcus aureus have shown resistance to some antibiotics. Medical practitioners have opted for the use of honey in treating bacterial infections due to its antibacterial properties. Researches have proven that honey can kill or inhibit almost every bacteria and is very effective in wound treatment as compared to antibiotics. In light of this most medical practitioners prefer the use of honey in treating bacterial infections.

scholarly journals Antibacterial structure–activity relationship studies of several tricyclic sulfur-containing flavonoids

2016 ◽  
Vol 12 ◽  
pp. 1065-1071 ◽  
Author(s):  
Lucian G Bahrin ◽  
Henning Hopf ◽  
Peter G Jones ◽  
Laura G Sarbu ◽  
Cornelia Babii ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Properties ◽  
Antimicrobial Properties ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Structure Activity ◽  
Acidic Conditions ◽  
Relationship Study ◽  
Sulfur Containing

A structure–activity relationship study concerning the antibacterial properties of several halogen-substituted tricyclic sulfur-containing flavonoids has been performed. The compounds have been synthesized by cyclocondensation of the corresponding 3-dithiocarbamic flavanones under acidic conditions. The influence of different halogen substituents on the antibacterial properties has been tested against Staphylococcus aureus and Escherichia coli. Amongst the N,N-dialkylamino-substituted flavonoids, those having an N,N-diethylamino moiety exhibited good to excellent antimicrobial properties against both pathogens. Fluorine-substituted flavonoids were found to be less active than those bearing other halogen atoms.

A new approach to treatment of stomatitis in experiments on white rats (experimental research)

2018 ◽  
pp. 168-173
Author(s):  
Е.Б. Ганина ◽  
Ю.В. Червинец ◽  
Н.В. Грудинин ◽  
В.Г. Шестакова ◽  
В.М. Червинец ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Oral Cavity ◽  
Experimental Research ◽  
Quantitative Composition ◽  
Oral Diseases ◽  
New Approach ◽  
Highly Active ◽  
White Rats ◽  
Before And After ◽  
Intact Rats

Цель исследования - охарактеризовать микробиологическую картину стоматита до и после его лечения высокоактивными культурами лактобацилл, дать оценку эффективности их применения при экспериментальном стоматите. Методика. Опыты проводились на 32 самках беспородных белых крыс массой 230 г. Моделирование стоматита включало 2 этапа: моделирование травматического стоматита и воспроизведение бактериального стоматита на базе травматического. У крыс контрольной и опытных серий на всех этапах эксперимента брали мазки с поверхности десен для характеристики микробиоценоза ротовой полости. Результаты. После обработки слизистой оболочки полости рта (СОПР) культурой патогенного штамма Staphylococcus aureus существенно снизились частота встречаемости и количество условно-патогенных микроорганизмов. Лечение стоматита у крыс культурами лактобацилл ( Lactobacillus 11 зв., Lactobacillus 2 п.рта, Lactobacillus 24 д.ст.) и их комбинацией приводило к снижению распространенности S. aureus вплоть до его исчезновения, а также к нормализации количества условно-патогенной микробиоты. Заключение. Исследования показали эффективность использования отдельных высокоактивных штаммов лактобацилл или их комбинации при лечении заболеваний СОПР, в частности бактериального стоматита. Aim. To characterize the microbiological picture of stomatitis in intact rats before and after the treatment with highly active cultured lactobacilli and to evaluate the effectiveness of this treatment in experiments on white rats. Methods. Experiments were carried out on 32 mongrel female white rats weighing 230 g. Smears were taken from the gum surface of control and experimental rats at all stages of the experiment to characterize the oral cavity microbiocenosis. Results. After treatment of the oral cavity with cultured Staphylococcus aureus , the occurrence and quantity of opportunistic microorganisms significantly decreased. The treatment of stomatitis in rats with cultured lactobacillus ( Lactobacillus 11 zv., Lactobacillus 2 p.r., Lactobacillus 24 d.st. and their combination) led to a decrease in S. aureus prevalence up to its extinction and to normalization of the quantitative composition of opportunistic microbiota. Conclusions. The study showed the effieacy of highly active lactobacillus strains individually or their combinations in the treatment of oral diseases, in particular, bacterial stomatitis.

EFECTO INHIBITORIO DE EXTRACTOS DE Vitex mollis Kunth CONTRA BACTERIAS Y ESPECIES DE Fusarium DE IMPORTANCIA HUMANA Y AGRÍCOLA

2018 ◽  
Vol 41 (4) ◽  
pp. 353-363
Author(s):  
Alberto J. Valencia-Botin ◽  
Melesio Gutiérrez-Lomelí ◽  
Juan A. Morales-Del-Río ◽  
Pedro J. Guerrero-Medina ◽  
Miguel A. Robles-García ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Salmonella Enterica ◽  
Micrococcus Luteus ◽  
E Coli

Actualmente existe la necesidad de hacer frente al problema de la resistencia a los antibióticos y al uso indiscriminado de fungicidas químicos en la agricultura. El objetivo de este trabajo fue evaluar el efecto inhibitorio de extractos acuosos, metanólicos, acetónicos y hexánicos de hoja y tallo de Vitex mollis Kunth (Lamiaceae) contra diferentes bacterias (Escherichia coli, Micrococcus luteus, Salmonella enterica y Staphylococcus aureus) y especies del hongo Fusarium (F. verticillioides, F. oxysporum, F. tapsinum y F. oxysporum f.sp. lycopersici) de importancia en la salud y en la agricultura, así como determinar su composición química general. Se determinaron las concentraciones inhibitorias mínimas (CIM) de todos los extractos por la técnica de microdilución, excepto del hexánico, que no presentó inhibición en las bacterias estudiadas. S. enterica fue la bacteria que mostró mayor sensibilidad al extracto metanólico de tallo (CIM = 28 μg mL-1), le siguieron M. luteus (CIM = 32 μg mL-1), S. aureus (CIM = 75 μg mL-1) y E. coli (CIM = 80 μg mL- 1). Los extractos metanólicos y acuosos de tallo presentaron mayor porcentaje de inhibición contra los diferentes tipos de Fusarium evaluados por el método de dilución en agar. Los extractos de V. mollis inhibieron a F. verticillioides entre 62 y 91 % con 120 μg mL-1 de extracto. El orden de las especies de hongos inhibidas por los extractos fue: F. verticillioides > F. oxysporum > F. tapsinum > F. oxysporum f.sp. lycopersici. La composición química de las especies se determinó mediante pruebas para fenoles, taninos, flavonoides, triterpenos, alcaloides, cumarinas y saponinas. Ninguno de los extractos presentó alcaloides y saponinas. Los fenoles (37.1 mg EAG/g muestra seca) y flavonoides (26.8 mg EQ/g muestra seca) fueron los compuestos mayoritarios en los extractos metanólicos y acuosos. En conclusión, se requieren cantidades muy pequeñas de extracto para la inhibición de bacterias y de Fusarium; por lo tanto, V. mollis puede ser considerada una fuente de metabolitos para este fin y en la agricultura como control alternativo dentro de un manejo integrado de enfermedades.

Garlic Extract (Allium sativum L.) Effectively Inhibits Staphylococcus aureus and Escherichia coli by Invitro Test

2020 ◽  
Vol 2 (2) ◽  
pp. 61-68
Author(s):  
Agnina Listya Anggraini ◽  
Ratih Dewi Dwiyanti ◽  
Anny Thuraidah
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Bacterial Infections ◽  
Allium Sativum ◽  
Antibacterial Properties ◽  
Herbal Medicines ◽  
Garlic Extract ◽  
Dilution Method ◽  
Initial Stage

Infection is a disease caused by the presence of pathogenic microbes, including Staphylococcus aureus and Escherichia coli. Garlic (Allium sativum L.) has chemical contents such as allicin, alkaloids, flavonoids, saponins, tannins, and steroids, which can function as an antibacterial against Staphylococcus aureus and Escherichia coli. This study aims to determine the antibacterial properties of garlic extract powder against Staphylococcus aureus and Escherichia coli. This research is the initial stage of the development of herbal medicines to treat Staphylococcus aureus and Escherichia coli infections. The antibacterial activity test was carried out by the liquid dilution method. The concentrations used were 30 mg/mL, 40 mg/mL, 50 mg/mL, 60 mg/mL and 70 mg/mL. The results showed that the Minimum Inhibitory Concentration (MIC) against Staphylococcus aureus and Escherichia coli was 40 mg/mL and 50 mg / mL. Minimum Bactericidal Concentration (MBC) results for Staphylococcus aureus and Escherichia coli are 50 mg/mL and 70 mg/mL. Based on the Simple Linear Regression test, the R2 value of Staphylococcus aureus and Escherichia coli is 0.545 and 0.785, so it can be concluded that there is an effect of garlic extract powder on the growth of Staphylococcus aureus and Escherichia coli by 54.5% and 78.5%. Garlic (Allium sativum L.) extract powder has potential as herbal medicine against bacterial infections but requires further research to determine its effect in vivo.

scholarly journals Au–ZnO Conjugated Black Phosphorus as a Near-Infrared Light-Triggering and Recurrence-Suppressing Nanoantibiotic Platform against Staphylococcus aureus

Pharmaceutics ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 52
Author(s):  
Atanu Naskar ◽  
Sohee Lee ◽  
Kwang-sun Kim
Keyword(s):  
Staphylococcus Aureus ◽  
Bacterial Infections ◽  
Near Infrared ◽  
Au Nanoparticles ◽  
Synthesis Method ◽  
Antibacterial Properties ◽  
Black Phosphorus ◽  
Infrared Light ◽  
Resistant Bacteria ◽  
Near Infrared Light

Antibiotic therapy is the gold standard for bacterial infections treatment. However, the rapid increase in multidrug-resistant (MDR) bacterial infections and its recent use for secondary bacterial infections in many COVID-19 patients has considerably weakened its treatment efficacy. These shortcomings motivated researchers to develop new antibacterial materials, such as nanoparticle-based antibacterial platform with the ability to increase the chances of killing MDR strains and prevent their drug resistance. Herein, we report a new black phosphorus (BP)-based non-damaging near-infrared light-responsive platform conjugated with ZnO and Au nanoparticles as a synergistic antibacterial agent against Staphylococcus aureus species. First, BP nanosheets containing Au nanoparticles were assembled in situ with the ZnO nanoparticles prepared by a low-temperature solution synthesis method. Subsequently, the antibacterial activities of the resulting Au–ZnO–BP nanocomposite against the non-resistant, methicillin-resistant, and erythromycin-resistant S. aureus species were determined, after its photothermal efficacy was assessed. The synthesized nanocomposite exhibited excellent anti-S. aureus activity and good photothermal characteristics. The non-resistant S. aureus species did not produce drug-resistant bacteria after the treatment of multiple consecutive passages under the pressure of the proposed nanoantibiotic, but rapidly developed resistance to erythromycin. This work clearly demonstrates the excellent photothermal antibacterial properties of Au–ZnO–BP nanocomposite against the MDR S. aureus species.

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