scholarly journals Effect of Storage Period on Silver Nanoparticles Biosynthesized By Pseudomonas Aeroginosa

2019 ◽  
Vol 9 (04) ◽  
pp. 678-681
Author(s):  
Ashraf S Hassan ◽  
Khawlah J Khalaf ◽  
Hamzia A Ajah
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Candida Albicans ◽  
Storage Period ◽  
Before And After ◽  
Pathogenic Microbes

The present study demonstrates the effect of storage period on silver nanoparticles (AgNPs), which synthesized by Pseudomonas aeruginosa and their antibacterial activity. The result shows that the size of (AgNPs) which synthesis by Pseudomonas aeruginosa was 93.55nm after 4-72hour, and when storage about 2 years, we found that the size of AgNPs was stable and reduced to 69.0nm. Antibacterial activity against pathogenic microbes: Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Serratia sp,Streptococcus sp , Klebsiella sp, Candida albicans was performed before and after storage and found that AgNPs have activity against this microbes.

scholarly journals UTILIZAÇÃO DE GÁS OZÔNIO NA DESINFECÇÃO DE RESÍDUOS DE SERVIÇOS DE SAÚDE

2018 ◽  
Vol 7 (2) ◽  
pp. 125-139
Author(s):  
Thais Nogueira Gonzaga ◽  
Dora Inés Kozusny-Andreani
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Candida Albicans ◽  
Health Care Services ◽  
Pathogenic Bacteria ◽  
Ozone Treatment ◽  
Microbiological Analysis ◽  
Before And After ◽  
Staphylococcus Spp

Nesta pesquisa objetivou-se avaliar a viabilidade técnica da aplicação de ozônio como bactericida e fungicida em amostras de resíduos de serviços de saúde potencialmente infectantes. Foram determinados os     micro-organismos presentes nos resíduos gerados em um hospital particular. Para realização das análises microbiológicas e o tratamento com ozônio o material foi particulado e homogeneizado. As análises microbiológicas foram realizadas antes e após a ozonização.Para os testes de desinfecção foram retirados 10,0g de amostra que foi submetida à ozonização por 5, 10, 15, 20 e 25 minutos com doses de 140,0; 280,0; 420,0; 560,0 e 700,0mg L-1 de ozônio, respectivamente. Verificou-se presença de mesófilos totais, coliformes totais e termotolerantes, Escherichia coli, Pseudomonas aeruginosa, Proteus spp., Staphylococcus aureus, Staphylococcus spp, Candida albicans e Rhizopus spp. O ozônio foi eficiente para eliminação de todos os micro-organismos em 20 minutos; nos primeiros cinco minutos de exposição ao gás verificou-se redução superior a 98%.Palavras-chave: Bactérias patogênicas. Fungos. Ozonização. USING OZONE GAS FOR DISINFECTION OF SOLID WASTE FROM HEALTH CARE SERVICES ABSTRACT: The aim of this research was to evaluate the technical viability of the application of ozone as bactericide and fungicide in samples of potentially infectious health services residues. The microorganisms present in the waste generated in a private hospital were determined. The material was particulated and homogenized to perform the microbiological analysis and to undergo ozone treatment. Microbiological analysis was performed before and after ozonization. For the disinfection tests, 10.0g of sample were removed and submitted to ozonization for 5, 10, 15, 20 and 25 minutes with 140,0; 280,0; 420,0; 560,0 and 700,0mg doses of L-1 of ozone, respectively. It was verified the presence of total mesophiles, total and thermotolerant coliforms, Escherichia coli, Pseudomonas aeruginosa, Proteus spp., Staphylococcus aureus, Staphylococcus spp, Candida albicans and Rhizopus spp. Ozone was efficient while eliminating all microorganisms in 20 minutes; in the first five minutes of gas exposure, the reduction was greater than 98%.Keywords: Pathogenic bacteria. Fungi. Ozonization.

scholarly journals Development of technology of disinfectants based on soda production waste

2019 ◽  
Vol 140 ◽  
pp. 01004
Author(s):  
Elina Salmanova ◽  
Lyasan Araslanova ◽  
Iren Tuktarova ◽  
Alexey Nazarov
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Candida Albicans ◽  
Iodine Monochloride ◽  
Waste Production ◽  
Bacillus Subtilus ◽  
High Level ◽  
Technical And Economic Indicators

The main requirements for the development of fundamentally new disinfectants with a high level of efficiency are to reduce toxicity by increasing the technical and economic indicators in the technology of their application. In this paper, an innovative composition of a disinfectant based on iodine monochloride in the complex of waste production of soda and polyvinylpyrrolidone is proposed. The dependence of stability and antibacterial activity of the developed disinfectant is studied. High indicators of stability (3 years) and antibacterial activity were obtained on the example of Staphylococcus aureus (S. aureus), Enterococcus fecalis (E. fecalis), Pseudomonas aeruginosa (P. aerginosa), Bacillus subtilus (B. Subtilis No. 12) at the concentration 0.027-0.055, DS versus commercial drug Zhavilar. The antibacterial activity of the disinfectant DS, DS-1 is maintained up to 0.0044-0.0088 for Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans and Escherichia coli and exceeds the efficiency of the commercial drug Betadine by 8-28 times. Thus, the developed formulations are highly effective, while low-toxic and safe for the environment and humans.

scholarly journals IN VITRO EVALUATION OF ANTIMICROBIAL ACTIVITY OF MICRO PROPAGATED CALLUS OF CURUULIGO ORCHIODES (BLACK MUSILLI) AGAR WELL DIFFUSION AND MINIMUM INHIBITORY CONCENTRATION (MIC)

2017 ◽  
Vol 9 (3) ◽  
pp. 75
Author(s):  
Rajanikanth Garapati ◽  
N. Ramesh
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Candida Albicans ◽  
Bacillus Cereus ◽  
Proteus Vulgaris ◽  
Methanol Extracts ◽  
Tract Infections

Objective: In vitro investigated the potential of methanol extracts of micro-propagated C. orchiodes in the antimicrobial property against the three gram-negative bacteria, two gram-positive and one fungal filament.Methods: The micro propagated callus methanol extract was examined against Escherichia coli, Proteus vulgaris, Salmonella typhimurium, Pseudomonas aeruginosa, Staphylococcus aureus, Bacillus cereus and Candida albicans. The zone of inhibitions are determined at 10 mg/ml concentration of methanol extracts of callus on agar well plate and MIC against tested microorganism.Results: The highest antibacterial activity recorded in Staphylococcus aureus Bacillus cereus and followed by Candida albicans. Antibacterial activity of leaf extracts of A. reticulata was also significant against the tested microorganisms Escherichia coli, Salmonella typhi, Proteus vulgaris, Pseudomonas aeruginosa compared to ciprofloxacin.Conclusion: Based on the above observations, these extracts were further evaluated for their effect on microorganisms causing infections like typhoid fever, urinary tract infections, septicemia, toxic shock syndrome, skin infection, nosocomial infection, arthritis and diarrhoea. The results also suggest that these plants serve a therapeutic purpose in the treatment bacterial infections.

scholarly journals The Hydrophobicity and the Antibacterial Activity of Polyester Modified With Silver Nanoparticle and Hexadecyltrimethoxysilane

Molekul ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. 78
Author(s):  
Eli Rohaeti ◽  
Anna Rakhmawati
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Sodium Citrate ◽  
Polyester Fiber ◽  
Chemical Preparation ◽  
Fiber Modification ◽  
Polyester Fibers ◽  
Before And After

The objective of this research were to study hydrophobicity and antibacterial activity of polyester fibers before and after modification by using silver nanoparticles as antibacterial agent and hexadecyltrimethoxysilane (HDTMS) as self cleaning agent. The research was conducted in stages, chemical preparation of silver nanoparticles, deposit of silver nanoparticles on polyester fiber, modification of polyester fiber through the addition HDTMS, and characterization. Modification of polyester fibers with silver nanoparticles and HDTMS was conducted through dipping method, followed by curing. Characterization was conducted by testing the contact angle and antibacterial activity against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218. Silver nanoparticles has been prepared by adding sodium citrate and polyvinylalcohol as stabilizer. The addition of silver nanoparticles decreased hydrophobicity of polyester fibers without and with modification. Modification with HDTMS increased hydrophobicity of polyester fibers. Modification with silver nanoparticles and HDTMS increased antibacterial activity of polyester fabrics. Statistic analysis showed that there were significant differences in the antibacterial activity of polyester fibers against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218

Chemical Composition and Antibacterial Activity of Essential Oils of Three Medicinal Plants from Algerian Semi-Arid Climatic Zone

2018 ◽  
Vol 16 (S1) ◽  
pp. S155-S163 ◽  
Author(s):  
S. Mehalaine ◽  
O. Belfadel ◽  
T. Menasria ◽  
A. Messaili
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Rosmarinus Officinalis ◽  
Salvia Officinalis ◽  
Thymus Algeriensis

The present study was carried out to determine, for the first time, the chemical composition and antibacterial activity of essential oils derived from the aerial parts of three aromatic plants Thymus algeriensis Boiss & Reut, Rosmarinus officinalis L., and Salvia officinalis L. growing under semiarid conditions. The essential oils were chemically analyzed and identified by gas chromatography (GC) and GC/ mass spectrometry (GC/MS) and their antimicrobial activity was individually evaluated against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa using both agar disk diffusion and agar dilution methods. The major constituents of Thymus algeriensis essential oil were identified as camphor (13.62%), 1,8-cineol (6.00%), borneol (5.74%), viridiflorol (4.00%), and linalool (3.93%). For Rosmarinus officinalis essential oil, 48 compounds were characterized, of which the main constituents were camphor (17.09%), Z-β-ocimene (10.88%), isoborneol (9.68%), α-bisabolol (7.89%), and borneol (5.11%). While, Salvia officinalis essential oil was characterized by β-thujone (16.44%), followed by viridiflorol (10.93%), camphor (8.99%), 1,8-cineol (8.11%), trans-caryophyllene (5.85%), and α-humulene (4.69%) as the major components. Notably, results from antibacterial screening indicated that Thymus algeriensis and Salvia officinalis essential oils exhibited a strong inhibitory effect against both Escherichia coli and Staphylococcus aureus compared to Rosmarinus officinalis essential oil. Further, less activity was recorded against Pseudomonas aeruginosa for the three tested essential oils.

Complexes of Cu (II) with a-Ketoglutaric Acid and 1- (o-tolyl) Biguanide Synthesis, characterization and biological Activity

2019 ◽  
Vol 70 (10) ◽  
pp. 3603-3610
Author(s):  
Madalina Mihalache ◽  
Cornelia Guran ◽  
Aurelia Meghea ◽  
Vasile Bercu ◽  
Ludmila Motelica ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Biological Activity ◽  
Candida Albicans ◽  
Antifungal Activity ◽  
Copper Complexes ◽  
Substrate Adhesion ◽  
Inert Substrate

The three copper complexes having a-ketoglutaric acid (H2A) and 1- (o-tolyl) biguanide (TB) ligands have been synthesized and characterized. The proposed formulas for these complexes are: [Cu(TB)(HA)]Cl (C1), [Cu(TB)(HA)CH3COO]�H2O (C2) and [Cu(TB)(HA)](NO3) (C3) where HA represents deprotonated H2A. The complexes obtained were tested for antibacterial activity against Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853, antifungal activity on Candida albicans ATCC 10231 and antitumor activity on HeLa tumor cells. Due to the antitumor, antifungal, antimicrobial activity and inhibition of inert substrate adhesion, complexes synthesized could be used for potential therapeutic applications.

scholarly journals Jabuticaba skin extracts: phenolic compounds and antibacterial activity

2018 ◽  
Vol 21 (0) ◽  
Author(s):  
Flávia Cíntia de Oliveira ◽  
Tamara Rezende Marques ◽  
Gustavo Henrique Andrade Machado ◽  
Thaís Cristina Lima de Carvalho ◽  
Aline Aparecida Caetano ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Listeria Monocytogenes ◽  
Phenolic Compounds ◽  
Methanolic Extract ◽  
Ethanolic Extract ◽  
Salmonella Choleraesuis ◽  
Pharmaceutical Industries

Abstract The phenolic compounds from various extracts of jabuticaba skin powder (JSP) were characterized in this study, and the antibacterial activity assessed. The phenolic compounds were extracted from the JSP using four methods: a) acetone extraction - 1 g JSP: 10 mL 70% acetone, resting for 2 hours; b) aqueous extract - 1 g JSP: 15 mL water, under agitation; c) ethanolic extract - 1 g JSP: 15 mL acidified ethanol, under agitation; and d) methanolic extract - 1 g JSP: 50 mL 50% methanol, under reflux. The antibacterial activity was evaluated by the agar diffusion assay, using Escherichia coli ATCC 11229, Salmonella choleraesuis ATCC 6539, Pseudomonas aeruginosa ATCC 15442, Staphylococcus aureus ATCC 6538 and Listeria monocytogenes ATCC 19117. The ethanolic and methanolic extracts showed the highest levels of phenolic compounds, especially of cyanidin chloride, catechin and epicatechin. The extracts did not inhibit the growth of Escherichia coli and Salmonella choleraesuis, but inhibited 30% of the growth of Pseudomonas aeruginosa with an extract concentration of 250 µg mL-1. Against Staphylococcus aureus and Listeria monocytogenes the highest inhibitory effect observed was 41.8% for the ethanolic extract, followed by 36% inhibition by the methanolic extract, thus revealing the potential of these extracts as possible alternatives for use in the food and/or pharmaceutical industries.

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 FLORAL EXTRACT OF Tibouchina granulosa (DESR.) COGN. PHYTOCHEMISTRY PROSPECTION, AND ANTIBACTERIAL ACTIVITY

2021 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Antonio Carlos Pereira de Menezes Filho ◽  
Matheus Vinícius Abadia Ventura ◽  
Carlos Frederico de Souza Castro
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Enterococcus Faecalis ◽  
Floral Organ ◽  
Salt Formation ◽  
Bacterial Strains ◽  
Positive Results

Tibouchina granulosa is a species that blooms annually in several regions of Brazil. This species is still little explored in terms of phytocompounds in all organs of this plant, especially the floral organ. Flowers of T. granulosa were collected in the municipality of Rio Verde, Goiás, Brazil, in 2021. The hydroethanolic floral extract was prepared by maceration and qualitative phytochemical (colorimetric reactions and salt formation) and antibacterial analyzes performed and the results expressed in millimeters of inhibition at different concentrations in mg mL-1. Several phytochemical classes were observed with positive results, especially for alkaloids, phenolics, oxylates, saponins, carbohydrates and tannins. As for the bacterial assay, potential antibacterial activity was observed for all bacterial strains tested, except for Salmonella serovar Thyphymurium and serovar Enteritidis. Expressive inhibitions were observed for Enterococcus faecalis > Pseudomonas aeruginosa > Staphylococcus aureus and Escherichia coli at the highest concentrations between 100-50 mg mL-1. The floral extract of Tibouchina granulosa showed phytotherapeutic potential with the presence of several phytochemical groups and expressive antibacterial activity.

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