scholarly journals UJI EFEKTIVITAS ANTIBAKTERI EKSTRAK ETANOLIK BAWANG MERAH (Allium cepa L.) TERHADAP BAKTERI Staphylococcus aureus DALAM MEDIA MUELLER HINTON AGAR (MHA)

2021 ◽  
Vol 16 (1) ◽  
pp. 1-7
Author(s):  
Amalia Desty Nofita
Keyword(s):  
Staphylococcus Aureus ◽  
Allium Cepa ◽  
Mueller Hinton ◽  
Allium Cepa L ◽  
Mueller Hinton Agar

scholarly journals Synergy of Daptomycin with Oxacillin and Other β-Lactams against Methicillin-Resistant Staphylococcus aureus

2004 ◽  
Vol 48 (8) ◽  
pp. 2871-2875 ◽  
Author(s):  
Kenneth H. Rand ◽  
Herbert J. Houck
Keyword(s):  
Staphylococcus Aureus ◽  
Bactericidal Activity ◽  
Screening Method ◽  
Methicillin Resistant ◽  
Drug Concentrations ◽  
Mueller Hinton ◽  
Mueller Hinton Agar ◽  
High Level ◽  
Time Kill

ABSTRACT We previously observed marked synergy between daptomycin and both rifampin and ampicillin against vancomycin-resistant enterococci (VRE). Because the synergy between daptomycin and ampicillin was observed for 100% of VRE strains with high-level ampicillin resistance (ampicillin MIC of ≥128 μg/ml), we looked for synergy between daptomycin and other β-lactams against 18 strains of methicillin-resistant Staphylococcus aureus (MRSA) by employing a time-kill method using Mueller-Hinton broth supplemented to 50 mg of Ca2+/liter. All strains were resistant to oxacillin (16 of 18 strains were resistant at drug concentrations of ≥256 μg/ml), and all strains were susceptible to daptomycin (the MIC at which 90% of the tested isolates were inhibited was 1 μg/ml). Daptomycin was tested at concentrations of 2, 1, 0.5, 0.25, 0.125, and 0.0625 μg/ml alone or in combination with oxacillin at a fixed concentration of 32 μg/ml. Synergy was found for all 18 strains with daptomycin at one-half the MIC in combination with 32 μg of oxacillin/ml, and synergy was found for 11 of 18 strains (61%) with daptomycin at one-fourth the MIC or less in combination with oxacillin. At 24 h, the daptomycin-oxacillin combination with daptomycin at one-half the MIC showed bactericidal activity against all 18 strains, and the combination with one-fourth the daptomycin MIC showed bactericidal activity against 9 of 18 strains. We also used a novel screening method to look for synergy between daptomycin and other β-lactams. In this approach, daptomycin was incorporated into Ca2+-supplemented Mueller-Hinton agar at subinhibitory concentrations, and synergy was screened by comparing test antibiotic Kirby-Bauer disks on agar with and without daptomycin. By this method, daptomycin with ampicillin-sulbactam, ticarcillin-clavulanate, or piperacillin-tazobactam showed synergy comparable to or greater than daptomycin with oxacillin. For seven of the eight strains tested, time-kill studies confirmed synergy between daptomycin and ampicillin-sulbactam with ampicillin in the range of 2 to 8 μg/ml. The combination of daptomycin and β-lactams may be useful for the treatment of MRSA infection, but further studies are needed to elucidate the mechanisms and to determine the in vivo efficacy of the combination.

scholarly journals OptimizedIn VitroAntibiotic Susceptibility Testing Method for Small-Colony Variant Staphylococcus aureus

2016 ◽  
Vol 60 (3) ◽  
pp. 1725-1735 ◽  
Author(s):  
Mimi R. Precit ◽  
Daniel J. Wolter ◽  
Adam Griffith ◽  
Julia Emerson ◽  
Jane L. Burns ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Susceptibility Testing ◽  
Brain Heart Infusion ◽  
Chronic Infections ◽  
Poor Growth ◽  
Content Type ◽  
Treatment History ◽  
Mueller Hinton ◽  
Mueller Hinton Agar ◽  
Small Colony

Staphylococcus aureussmall-colony variants (SCVs) emerge frequently during chronic infections and are often associated with worse disease outcomes. There are no standardized methods for SCV antibiotic susceptibility testing (AST) due to poor growth and reversion to normal-colony (NC) phenotypes on standard media. We sought to identify reproducible methods for AST ofS. aureusSCVs and to determine whether SCV susceptibilities can be predicted on the basis of treatment history, SCV biochemical type (auxotrophy), or the susceptibilities of isogenic NC coisolates. We tested the growth and stability of SCV isolates on 11 agar media, selecting for AST 2 media that yielded optimal SCV growth and the lowest rates of reversion to NC phenotypes. We then performed disk diffusion AST on 86S. aureusSCVs and 28 isogenic NCs and Etest for a subset of 26 SCVs and 24 isogenic NCs. Growth and reversion were optimal on brain heart infusion agar and Mueller-Hinton agar supplemented with compounds for which most clinical SCVs are auxotrophic: hemin, menadione, and thymidine. SCVs were typically nonsusceptible to either trimethoprim-sulfamethoxazole or aminoglycosides, in accordance with the auxotrophy type. In contrast, SCVs were variably nonsusceptible to fluoroquinolones, macrolides, lincosamides, fusidic acid, and rifampin;mecA-positive SCVs were invariably resistant to cefoxitin. All isolates (both SCVs and NCs) were susceptible to quinupristin-dalfopristin, vancomycin, minocycline, linezolid, chloramphenicol, and tigecycline. Analysis of SCV auxotrophy type, isogenic NC antibiograms, and antibiotic treatment history had limited utility in predicting SCV susceptibilities. With clinical correlation, this AST method and these results may prove useful in directing treatment for SCV infections.

scholarly journals AVALIAÇÃO DA ATIVIDADE ÓLEOS ESSENCIAIS DE Thimus vulgaris (TOMILHO), Syzygium aromaticum (CRAVO-DA-INDIA) E Rosmarinus officinalis (ALECRIM) E DOS CONSERVANTES BENZOATO DE SÓDIO E SORBATO DE POTÁSSIO EM Escherichia coli E Staphylococcus aureus

2015 ◽  
Vol 33 (1) ◽  
Author(s):  
Angela Aparecida Da Silva ◽  
Márcia Maria Dos Anjos ◽  
Suelen Pereira Ruiz ◽  
Lucimara Bergamo Panice ◽  
Jane Martha Graton Mikcha ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Rosmarinus Officinalis ◽  
Thymus Vulgaris ◽  
Syzygium Aromaticum ◽  
E Coli ◽  
Mueller Hinton ◽  
Mueller Hinton Agar

Neste trabalho foi avaliada a ação dos óleos essenciais de Thymus vulgaris (tomilho), Syzygium aromaticum (cravo-da-índia) e Rosmarinus officinalis (alecrim) e dos conservantes benzoato de sódio e sorbato de potássio como agentes antimicrobianos. As cepas de Staphylococcus aureus (ATCC 25923) e Escherichia coli (ATCC 25922) foram utilizadas no teste de susceptibilidade antimicrobiana usando-se a técnica de microdiluição em microplaca de 96 poços para avaliação da Concentração Inibitória Mínima (CIM) e, posteriormente, subcultivo em Mueller Hinton Agar para avaliaçãoda Concentração Bactericida Mínima (CBM). As concentrações dos óleos e conservantes sintéticos testados variaram de 15,6 a 1000μg/mL. As microdiluições utilizando inóculos bacterianos nas concentrações de 104 UFC/mL foram incubadas a 37ºC/24h. As CIM para os óleos essenciais de cravo, tomilho e alecrim foram de 550, 650 e >1000μg/mL para E. coli e 550, 800 e 1000μg/mL para S. aureus, respectivamente. No entanto, a ação bactericida dos óleos essenciais do cravo-da-índia e do tomilho foi encontrada apenas em relação a E. coli, na concentração de 550 e 850μg/mL, respectivamente. Para os dois conservantes sintéticos testados, a CIM foi >1000μg/mL, portanto não apresentaram atividade antibacteriana contra os microrganismos testados. Trabalhos futuros deverão ser realizados para verifi car a efi ciência dos antimicrobianos naturais anteriormente citados e para avaliar a possibilidade de serem utilizados na indústria de alimentos.   

scholarly journals AKTIVITAS ANTIBAKTERI EKSTRAK KULIT BAWANG MERAH (Allium cepa L.) TERHADAP BAKTERI Staphylococcus aureus

2016 ◽  
Vol 2 (2) ◽  
pp. 138-144
Author(s):  
Misna Misna ◽  
Khusnul Diana
Keyword(s):  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Allium Cepa ◽  
Inhibition Zone ◽  
Activity Test ◽  
Allium Cepa L

One of the plants tat used in medicine is garlic (Allium cepa L.). In addition as medicinal traditional plant, garlic is used as food spice. Garlic utillizated for the root only, and the skin which is rich with fibrous and flavonoid is wasted. This research aim is to know if the garlic skin have antibacterial activity against Staphylococcus aureus. Garlic skin made into extract with maseration methode using 96% ethanol. Antibacterial activity test with hollow diffusion methode. Te parameter used are inhibition zone created. Variation of concentration are 5%b/v, 10%b/v, 20%b/v, 40%b/v, 60%b/v, 80%b/v. Activity test made with extract added in the hole in the Staphylococcus aureus media, then incubated at temperature 370C 24 hours. The inhibition zone 5%, 10%, 20%, 40%, 60%, and 80% extract respectively were 7,00mm, 8,30mm, 9,60mm, 11,00mm, 12,33m and 14,33mm

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 Inducible clindamycin resistance among staphylococci isolated from clinical samples in an urban hospital of Dhaka City

1970 ◽  
Vol 5 (1) ◽  
pp. 6-8
Author(s):  
Shameem Akhter ◽  
SM Zahurul Haque ◽  
M Mushfequr Rahman
Keyword(s):  
Staphylococcus Aureus ◽  
Tertiary Care ◽  
Clinical Samples ◽  
Care Hospital ◽  
Urban Hospital ◽  
Inducible Clindamycin Resistance ◽  
Inducible Resistance ◽  
Mueller Hinton ◽  
Mueller Hinton Agar ◽  
Resistant Strains

Inducible clindamycin resistance was detemined in 200 clinical isolates of staphylococci from pus (53.5%) and wound swab (46.5%). The study was done from July 2009 to June 2010, in the Department of Microbiology, BIHS Hospital Dhaka. Inducible clindamycin resistance was demonstrated by placing an erythromycin disc (15 ìg) 15 mm apart from the edge of a clindamycin (2 ìg) disc in Mueller Hinton agar. When the clindamycin inhibited zone becomes D- shaped the organism was regarded as positive for inducible resistance (D- test positive). Out of 200 staphylococci, 20% had inducible clindamycin resistance, 5% had constitutive clindamycin resistance and remaining 75% was clindamycin sensitive. In case of methicillin resistant Staphylococcus aureus (MRSA), 48% had inducible clindamycin resistance while 11.5% was constitutively resistant to clindamycin and remainder were clindamycin sensitive. All clindamycin resistant strains were 100% sensitive to vancomycin and linezolid followed by gentamycin (42%) and tetracycline (42.3%). The findings demonstrated that a substantial proportion of staphylococci in our tertiary care hospital had inducible resistance to clindamycin.Ibrahim Med. Coll. J. 2011; 5(1): 6-8 Key words: Staphylococcus aureus; Inducible clindamycin resistance; Constitutive clindamycin resistance; D-testDOI: http://dx.doi.org/10.3329/imcj.v5i1.9853  

scholarly journals Uji Kandungan Fitokimia dan Aktivitas Antibakteri dari Ekstrak Etanolik Bawang Dayak terhadap Bakteri Staphylococcus Aureus dalam Media Mueller Hinton Agar

2021 ◽  
Vol 10 (1) ◽  
pp. 1-6
Author(s):  
Supriani Supriani ◽  
Nurwijayanti Nurwijayanti
Keyword(s):  
Staphylococcus Aureus ◽  
Mueller Hinton ◽  
Mueller Hinton Agar

Infeksi merupakan penyakityang disebabkan oleh bakteri. Antibakteri adalah zat yang dapat mengganggu pertumbuhan atau bahkan mematikan bakteri.Bawangdayak telah dilaporkan mengandung senyawa yang memiliki kemampuan sebagai antibakteri. Penelitian ini bertujuan untuk mengetahui kandungan fitokimia dan uji aktivitas antibakteri dari ekstrak etanolik bawang dayak terhadap bakteri Staphylococcus aureus dalam media Mueller Hinton Agar (MHA).Metode:Metode yang digunakan untuk ekstraksi bawang dayak adalah maserasi, dengan pelarut etanol 96%. Ekstrak etanolik yang diperoleh diuji kandungan fitokimia dan aktivitas antibakteri terhadap bakteri Staphylococcus aureusdengan teknik disk diffusion.Hasil penelitian menunjukkan, kandungan fitokimia yang terdapat pada ekstrak etanolik bawang dayak mengandung golongan senyawa flavonoid, kuinon, polifenol, steroid, dan tannin. Ekstrak etanolik bawang dayak memiliki aktivitas antibakteri sedang dengan efektivitas yang rendah (<50%). Konsentrasi ekstrak etanolik bawang dayak 8% memiliki aktivitas antibakteri paling baik dengan rata-rata sebesar 6,94 mmdibandingkan dengan konsentrasi 4% dengan rata-rata 5,242 mm dan konsentrasi 6% sebesar 6,28 mm dilihat dari perhitungan efektivitas antibakteri.

scholarly journals PENENTUAN AKTIVITAS EKSTRAK ETANOL CABAI MERAH DALAM MENGHAMBAT PERTUMBUHAN BAKTERI

2021 ◽  
Vol 26 (1) ◽  
pp. 64-73
Author(s):  
Alfi Sapitri ◽  
Eva Diansari Marbun ◽  
Ulfayani Mayasari
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Ethanol Extract ◽  
Clear Zone ◽  
Capsicum Annum ◽  
Activity Test ◽  
Mueller Hinton ◽  
Mueller Hinton Agar ◽  
Escherichia Coli Bacteria

Penelitian ini bertujuan untuk melakukan uji fitokimia terhadap ekstrak etanol Cabai merah (Capsicum annum L.) dan uji aktivitasnya terhadap pertumbuhan bakteri Staphylococcus aureus dan Escherichia coli. Pengujian aktivitas antibakteri ini menggunakan metode difusi agar dengan menggunakan kertas cakram dengan tiga kali pengulangan. Ekstrak etanol cabai merah dibuat dengan konsentrasi 45, 60, 75, dan 90%. Uji aktivitas antibakteri dilakukan dengan metode Kirby Bauer. Media yang digunakan sebagai uji antibakteri pada penelitian ini yaitu Mueller-Hinton Agar (MHA). Hasil skrining fitokimia terhadap ekstrak etanol cabai merah menunjukkan adanya senyawa metabolit sekunder. Senyawa metabolit sekunder tersebut yaitu alkaloid, flavonoid, tanin, saponin, dan Steroid/triterpenoid. Steroid berfungsi sebagai antimikroba. Hasil penelitian ini juga mengungkapkan adanya kandungan senyawa capsaicin yang terkenal sebagai senyawa aktif antimikroba. Ekstrak etanol cabai merah memiliki aktivitas antibakteri terhadap bakteri Staphylococcus aureus dan Escherichia coli zona bening terendah pada konsentrasi 45% dan zona bening tertinggi pada konsentrasi 90%. Dapat disimpulkan bahwa ekstrak cabai merah memiliki aktivitas antibakteri terhadap penghambatan pertumbuhan bakteri.THE ABILITY OF RED CHILI ETHANOL EXTRACT IN INHIBITHING THE GROWTH OF BACTERIAThis study aimed to perform a phytochemical test on the ethanolic extract of red chili (Capsicum annum L.) and test its activity against the growth of Staphylococcus aureus and Escherichia coli bacteria. This antibacterial activity test used the agar diffusion method using disc paper with three repetitions. Red chili ethanol extract was made with concentrations of 45%, 60%, 75% and 90%. The antibacterial activity test was carried out using the Kirby Bauer method. The medium used as an antibacterial test in this study was Mueller-Hinton Agar (MHA). The results of phytochemical screening of red chili ethanol extract showed the presence of secondary metabolites. The secondary metabolites are alkaloids, flavonoids, tannins, saponins, and steroids/triterpenoids. Steroids serve as  antimicrobials. The results of this study also revealed the presence of capsaicin compounds which are known as active antimicrobial compounds. Red chili ethanol extract had antibacterial activity against Staphylococcus aureus and Escherichia coli bacteria in the lowest clear zone at a concentration of 45% and the highest clear zone at a concentration of 90%. It can be concluded that red chili extract has antibacterial activity against bacterial growth inhibition.

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