Photobiological characteristics of chlorophyll a derivatives as microbial PDT agents

2014 ◽  
Vol 13 (8) ◽  
pp. 1137-1145 ◽  
Author(s):  
Marciana P. Uliana ◽  
Layla Pires ◽  
Sebastião Pratavieira ◽  
Timothy J. Brocksom ◽  
Kleber T. de Oliveira ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Candida Albicans ◽  
Chlorophyll A ◽  
Photophysical Properties ◽  
Chlorin E6 ◽  
Photodynamic Activity

Chlorin-e6 (chl-e6) and a hydrogenated derivative (chl-e6H) were semi-synthesized, and their photophysical properties and photodynamic activity againstEscherichia coli,Staphylococcus aureusandCandida albicansevaluated.

Screening and antimicrobial activity of actinomycetes isolated from the rhizosphere of Clitoria ternatea

2016 ◽  
Vol 1 (01) ◽  
Author(s):  
Vemavarapu Bhaskara Rao ◽  
Kandlagunta Guru Prasad ◽  
Krishna Naragani ◽  
Vijayalakshmi Muvva
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Calcium Carbonate ◽  
Rhizosphere Soil ◽  
Soil Samples ◽  
Antimicrobial Spectrum ◽  
Clitoria Ternatea ◽  
Primary Screening

The air dried rhizosphere soil samples pretreated with calcium carbonate was employed for the isolation of actinomycete strains. Serial dilution plate technique was used for the isolation of actinomycetes. A total of 20 actinomycete strains designated as BS1-BS20 were isolated from the rhizosphere of medicinal plant Clitoria ternatea. All the 20 strains were subjected to primary screening for antimicrobial activity. Among the 20 strains screened, 10 strains exhibited high antimicrobial spectrum against Staphylococcus aureus, Escherichia coli and Candida albicans.

The In vitro Evaluation of the Antimicrobial Activity of Quercus robur L. Methanolic and Aqueous Leaves’ Extracts, from the Algerian High Plateaus Against some Uropathogenic Microbial Strains

2019 ◽  
Vol 18 (5) ◽  
pp. 262-274
Author(s):  
E. Benyagoub ◽  
N. Nabbou ◽  
S. Boukhalkhel ◽  
I. Dehini
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Enterococcus Faecalis ◽  
Fusidic Acid ◽  
Quercus Robur ◽  
Diffusion Method ◽  
Phytochemical Analysis ◽  
Microbial Strains

The medicinal value of the plants is due to their chemical components that bring a definite physiological action on the human body to prevent the diseases. In this work, we investigated the antimicrobial activity of leaves’ extracts of Quercus robur L., collected from the Algerian upper highlands, on ten bacterial strains and one fungal strain known to be pathogenic. First, we performed a qualitative phytochemical analysis, and second, antimicrobial activity tests performed by agar diffusion method (disc and well) with the determination of MIC by broth macro-dilution method. Given the results, it appears that obtained macerates of Quercus robur L. were rich in bioactive phytoconstituents such as alkaloids, anthraquinones, saponins, tannins, and other components. The yield of aqueous and methanolic macerates of leaves was 8.5 ± 1.41 and 22.4 ± 4.36%, respectively. The bacterial resistance was relatively important to several antibiotics, namely, ampicillin, amoxicillin + clavulanic acid for strains of Escherichia coli and Salmonella sp. However, Staphylococcus aureus strains were resistant to fusidic acid, penicillin, and oxacillin; while Enterococcus faecalis was resistant to fusidic acid, penicillin, oxacillin, and ticarcillin. The antibacterial activity of the macerates toward tested microbial strains showed that the aqueous and methanolic macerates of the leaves were proportional to the tested concentration and active not only against Gram-positive and Gram-negative bacteria but also on the fungal species Candida albicans. The estimated MIC for Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus was in the order of 10 mg/mL, which seems more effective than toward Salmonella sp., Klebsiella pneumoniae, Pseudomonas aeruginosa, and Candida albicans which were in the order of 30 mg/mL. These preliminary results confirm that the part of the studied plant had a very good antimicrobial activity that was proportional to the serial concentrations of the tested extracts.

Substituted 4-Formyl-2H-chromen-2-ones: Their Reaction with N-(2,3,4,6-Tetra-Oacetyl- β-D-galactopyranosyl)thiosemicarbazide, Antibacterial and Antifungal Activity of Their Thiosemicarbazone Products

2020 ◽  
Vol 24 (19) ◽  
pp. 2272-2282
Author(s):  
Vu Ngoc Toan ◽  
Nguyen Minh Tri ◽  
Nguyen Dinh Thanh
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Candida Albicans ◽  
Selenium Dioxide ◽  
Antibacterial And Antifungal Activity ◽  
E Coli ◽  
Antibacterial And Antifungal Activities ◽  
Alkyl Ethers ◽  
Antibacterial And Antifungal

Several 6- and 7-alkoxy-2-oxo-2H-chromene-4-carbaldehydes were prepared from corresponding alkyl ethers of 6- and 7-hydroxy-4-methyl-2-oxo-2H-chromen-2-ones by oxidation using selenium dioxide. 6- and 7-Alkoxy-4-methyl-2H-chromenes were obtained with yields of 57-85%. Corresponding 4-carbaldehyde derivatives were prepared with yields of 41-67%. Thiosemicarbazones of these aldehydes with D-galactose moiety were synthesized by reaction of these aldehydes with N-(2,3,4,6-tetra-O-acetyl-β-Dgalactopyranosyl) thiosemicarbazide with yields of 62-74%. These thiosemicarbazones were screened for their antibacterial and antifungal activities in vitro against bacteria, such as Staphylococcus aureus, Escherichia coli, and fungi, such as Aspergillus niger, Candida albicans. Several compounds exhibited strong inhibitory activity with MIC values of 0.78- 1.56 μM, including 8a (against S. aureus, E. coli, and C. albicans), 8d (against E. coli and A. niger), 9a (against S. aureus), and 9c (against S. aureus and C. albicans).

Influence of Removable Denture Cleaning Agents on Adhesion of Oral Pathogenic Microflora In Vitro: A Randomized Controlled Trial

2021 ◽  
Vol 14 (1) ◽  
pp. 656-664
Author(s):  
I.R. Volchkova ◽  
A.V. Yumashev ◽  
V.V. Borisov ◽  
V.I. Doroshina ◽  
E.A. Kristal ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Candida Albicans ◽  
Test Group ◽  
Control Group ◽  
Removable Dental Prostheses ◽  
Removable Denture ◽  
Group 2 ◽  
Adhesion Index ◽  
Group 1

Introduction: Removable dentures are used by 20% of the population. These may be accompanied by denture stomatitis in 15-70% of patients. The choice of the optimal cleansing agent for removable dental prostheses is of high significance. Aim: The aim of our research was to study the influence of removable denture cleansing products on the adhesion of microorganisms and yeast. Materials and Methods: We manufactured 144 specimens of standardized round shape with a diameter of 10 mm from 4 types of modern polymeric materials used by prosthetic dentistry to produce removable dentures, 12 specimens of each material were placed into suspensions of bacterial cultures of Staphylococcus aureus, Escherichia coli, Candida albicans, then into “ClearaSept” (Test group 1), “Рrotefix active cleanser” (Test group 2), saline solution (Control group), followed by nutrient media. The adhesion index was calculated and analyzed. Results: There was no reliable lowering of adhesion index of Staphylococcus Aureus to all materials detected in Test group 1 (U=6, p>0.05 for Bio XS; U=8, p>0.05 for Dental D, Denotokeep Peek, Vertex Rapid Simplified). In Test group 2, the adhesion index of Staphylococcus Aureus reliably decreased to all materials compared to the Control group (U=0, p≤0.01). The adhesion index of Candida albicans and Escherichia coli to all materials in Test group 1 had a minor to moderate reliable reduction compared to the Control group (U=0, p≤0.01). Test group 2 showed a significant reliable decrease in Candida albicans and Escherichia coli adhesion index to all materials in comparison with the Control group (U=0, p≤0.01). Conclusion: The research showed an unreliable or minor and moderate reliable decrease in microorganisms adhesion index depending on the microorganism species after treatment of denture material specimens by antibacterial soap “ClearaSept” and a reliable significant decrease in microbial and yeast adhesion after application of Protefix active cleaner solution, which demonstrates a more significant antimicrobial effect in comparison to “ClearaSept” against Staphylococcus aureus, Escherichia coli, and Candida albicans.

scholarly journals A Novel Antimicrobial Phenanthrene Alkaloid from Bryopyllum pinnatum

2011 ◽  
Vol 8 (3) ◽  
pp. 1456-1461 ◽  
Author(s):  
Donatus Ebere Okwu ◽  
Fred Uchenna Nnamdi
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Candida Albicans ◽  
Aspergillus Niger ◽  
Ethanolic Extract ◽  
Klebsiella Pneumonia ◽  
Antimicrobial Studies ◽  
Prevention And Treatment ◽  
Kalanchoe Pinnata ◽  
Isolated Compound

Phenenthrene alkaloid identified as 1-ethanamino 7 hex-1-yne-5I-one phenanthrene was isolated from the ethanolic extract of the leaves ofBryophyllum pinnatum(syn. B. calcinum kalanchoe pinnata) a versatile Nigeria medicinal plant. The structure was elucidated using NMR, IR, UV and MS spectral data. Antimicrobial studies showed that the isolated compound successfully inhibitedPsuedomonas aeruginosa, Klebsiella pneumonia, Staphylococcus aureus, Escherichia coli, Candida albicansandAspergillus niger. This result authenticates the use ofbryophyllum pinantumin phytomedicine for disease prevention and treatment of infections.

scholarly journals Antimicrobial Effect of Plasma-Activated Tap Water on Staphylococcus aureus, Escherichia coli, and Candida albicans

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1480
Author(s):  
William Chiappim ◽  
Aline da Graça Sampaio ◽  
Felipe Miranda ◽  
Mariana Fraga ◽  
Gilberto Petraconi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Tap Water ◽  
Antimicrobial Effect ◽  
Gliding Arc ◽  
Oxidation Reduction ◽  
Treatment Conditions ◽  
Oxidation Reduction Potential

In this study, the potential antimicrobial activity of plasma-activated tap water (PAW) was evaluated against Staphylococcus aureus, Escherichia coli, and Candida albicans. For this, PAW was prepared in a gliding arc plasma system using two treatment conditions: stagnant water and water stirring by a magnetic stirrer, called moving water. Subsequently, their oxidation-reduction potential (ORP), pH, electrical conductivity (σ), and total dissolved solids (TDS) were monitored in different areas of the sample divided according to the depth of the beaker. It was observed that PAW obtained in dynamic conditions showed a more uniform acidity among the evaluated areas with pH 3.53 and ORP of 215 mV. Finally, standardized suspensions of Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 10799), and Candida albicans (SC 5314) were treated with PAW, and the reduction of viable cells determined the antimicrobial effect. Our results indicate that the tap water, activated by plasma treatment using gliding arc, is an excellent inactivation agent in the case of Staphylococcus aureus and Escherichia coli. On the other hand, no significant antimicrobial activity was achieved for Candida albicans.

scholarly journals СИНТЕЗ ТА ДОСЛІДЖЕННЯ АНТИМІКРОБНОЇ АКТИВНОСТІ ДЕЯКИХ ПІРАЗОЛЗАМІЩЕНИХ 7H-[1,2,4]ТРИАЗОЛО[3,4-B][1,3,4]ТІАДІАЗИНІВ

2021 ◽  
pp. 5-13
Author(s):  
I. I. Myrko ◽  
T. I. Chaban ◽  
V. V. Ogurtsov ◽  
V. S. Matiychuk
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Candida Albicans ◽  
Drug Discovery ◽  
Klebsiella Pneumoniae ◽  
Acinetobacter Baumannii ◽  
Cryptococcus Neoformans ◽  
Antimicrobial Drug

Мета роботи. Здійснити синтез деяких нових піразолзаміщених 7H-[1,2,4]триазоло[3,4-b][1,3,4]тіадіазинів та провести дослідження антимікробних властивостей синтезованих сполук. Матеріали і методи. Органічний синтез, ЯМР-спектроскопія, елементний аналіз, фармакологічний скринінг. Результати й обговорення. У результаті взаємодії eтил (2Z)-хлоро(фенілгідразоно)ацетатів з ацетилацетоном було отримано етил 4-ацетил-5-метил-1-феніл-1H-піразол-3-карбоксилати. Зазначені сполуки піддали бромуванню, що дозволило одержати цільові бромкетони. Синтезовані на даній стадії етил 1-арил-4-(бромацетил)-5-метил-1Н-піразол-3-карбоксилати було введено у взаємодію з 4-аміно-5-арил(гетарил)-2,4-дигідро-3Н-1,2,4-триазол-3-тіонами з подальшим формуванням 1,3,4-тіадіазольного циклу та отриманням відповідних етил 1-арил-4-{3-арил(гетарил)-7H-[1,2,4]триазоло[3,4-b][1,3,4]тіадіазин-6-іл)}-5-метил-1H-піразол-3-карбоксилатів. Структура синтезованих сполук підтверджена даними елементного аналізу та ЯМР спектроскопією. В рамках міжнародного проекту "The Community for Antimicrobial Drug Discovery" (CO-ADD) за підтримки Wellcome Trust (Великобританія) і університету Квінсленда (Австралія) для синтезованих сполук здійснено скринінг антимікробної активності. Як тестові мікроорганізми використовували п'ять штамів бактерій: Escherichia coli ATCC 25922, Klebsiella pneumoniae ATCC 700603, Acinetobacter baumannii ATCC 19606, Pseudomonas aeruginosa ATCC 27853, Staphylococcus aureus ATCC 43300 та двох штамів грибків: Candida albicans ATCC 90028 і Cryptococcus neoformans ATCC 208821. Встановлено, що досліджувані сполуки виявляють різноманітну дію, від практично повної її відсутності до виразного антимікробного ефекту. Висновки. Здійснено синтез 12 нових етил 1-арил-4-{3-арил(гетарил)-7H-[1,2,4]триазоло[3,4-b][1,3,4]тіадіазин-6-іл)}-5-метил-1H-піразол-3-карбоксилатів. Зазначені речовини отримані шляхом взаємодії відповідних етил 1-арил-4-(бромацетил)-5-метил-1Н-піразол-3-карбоксилатів з 4-аміно-5-арил(гетарил)-2,4-дигідро-3Н-1,2,4-триазол-3-тіонами. Дослідження антимікробної активності синтезованих сполук демонструють потенціал пошуку антимікробних агентів серед зазначеного класу сполук.

scholarly journals UJI DAYA HAMBAT EKSTRAK DAN FRAKSI SPONS Aaptos Aaptos TERHADAP PERTUMBUHAN Escherichia coli, Staphylococcus aureus, dan Candida albicans

PHARMACON ◽  
2019 ◽  
Vol 8 (1) ◽  
pp. 168
Author(s):  
Sitti N Tunggali ◽  
Herny E. I. Simbala ◽  
Henki Rotinsulu
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Microbial Growth ◽  
Ethanol Extract ◽  
Chloroform Fraction ◽  
Marine Biota ◽  
Disc Diffusion ◽  
Average Value

ABSTRACT Sponge Aaptos aaptos is a marine biota that has great potential, which can be applied, in the pharmaceutical field because of the presence of large compounds in inhibiting microbial growth. This study aims to determine the inhibitory activity of extracts and fractions of sponge Aaptos aaptos on microbial growth of Escherichia coli, Staphylococcus aureus, and Candida albicans. The samples were extracted by maceration with 96 % ethanol and fractioned with n-hexane, choloroform and methanol. Testing is done using the Disc Diffusion Agar method. Crude ethanol extract and fraction of sponge Aaptos aaptos showed the greatest antimicrobial activity against Staphylococcus aureus and categorized as strong, with an average value of 20.32 mm for ethanol extract with strong categories, chloroform fraction 13,28 mm with medium category and methanol fractions 18,48 mm strong category. Keyword: Aaptos aaptos, antimicrobial activity, Escherichia coli, Staphylococcus aureus, Candida albicans.  ABSTRAK Spons Aaptos aaptos merupakan biota laut yang memiliki potensi sebagai antimikroba yang dapat diterapkan di bidang farmasi dengan kandungan senyawa yang besar dalam menghambat pertumbuhan mikroba. Penelitian ini bertujuan untuk mengetahui aktivitas daya hambat dari ekstrak dan fraksi spons Aaptos aaptos terhadap pertumbuhan mikroba Escherichia coli, Staphylococcus aureus, dan Candida albicans. Sampel diekstraksi secara maserasi dengan etanol dan difraksinasi dengan pelarut n–heksan, kloroform dan metanol. Pengujian dilakukan dengan menggunakan metode Disc Diffusion Agar. Ekstrak kasar etanol dan fraksi dari Spons Aaptos aaptos menunjukkan aktivitas antimikroba paling besar terhadap Staphylococcus aureus dan dikategorikan kuat, dengan nilai rata – rata 20,32 mm untuk ekstrak etanol dengan kategori kuat, fraksi kloroform 13,28 mm, kategori sedang dan fraksi metanol 18,48 mm kategori kuat.Kata Kunci : Aaptos aaptos, aktivitas antimikroba, Escherichia coli, Staphylococcus aureus, Candida albicans

scholarly journals Verificação da eficiência de um dispositivo de desinfecção por radiação UV-C

2021 ◽  
Vol 10 (6) ◽  
pp. e31310615817
Author(s):  
Alexsandro Silvestre da Rocha ◽  
Cláudia Adriana da Silva ◽  
Regina Lélis de Souza ◽  
Nilo Maurício Sotomayor Choque ◽  
Denisia Brito Soares ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Candida Albicans ◽  
Uv C

A Pandemia COVID-19, causada pelo vírus SARS-COV-2, evidenciou a necessidade de desenvolvimento de métodos seguros e economicamente viáveis para a realização de desinfecções em escala comercial e doméstica. Os coronavírus são mais suscetíveis à radiação UV-C do que fungos e bactérias e diversos estudos relacionados à eficiência da UVC contra o vírus causador da COVID-19 já foram realizados utilizando micro-organismos substitutos. Desta forma, este estudo buscou o desenvolvimento de um dispositivo acessível a usuários leigos para utilização em materiais que não podem ser submetidos a métodos convencionais de eliminação de micro-organismos (desinfecção química ou térmica). Esta pesquisa propôs a produção e validação de um dispositivo emissor de radiação UV-C portátil para a desinfeção de substratos suscetíveis a contaminação por bactérias, fungos e vírus patogênicos. O dispositivo foi desenvolvido a partir de materiais acessíveis a grande parte das empresas e população. Em seguida foi realizada a validação da eficiência do dispositivo através da exposição de culturas microbianas (bactéria Gram positiva, negativa e levedura) em diferentes intervalos de tempo. O dispositivo foi desenvolvido plenamente a partir de materiais de baixo custo e acessíveis. Todos os micro-organismos testados (Candida albicans, Staphylococcus aureus e Escherichia coli) foram eliminados do meio de cultura com menos de 20 min. de exposição. O dispositivo desenvolvido neste estudo pode ser construído por boa parte das empresas e população. O dispositivo se mostrou eficaz para reduzir o risco de contágio de diferentes micro-organismos patogênicos, sugerindo sua efetividade contra SARS- COV-2 causador da pandemia COVID-19.

Sign in / Sign up

Export Citation Format

Share Document