scholarly journals Evaluation of the Antibacterial Effectiveness of Some Antiseptics and Disinfectants

2021 ◽  
Vol 6 (1) ◽  
pp. 175-181
Author(s):  
A. I. Aminu ◽  
◽  
M. S. Abdullahi
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Inhibition Zone ◽  
Bacterial Isolates ◽  
E Coli ◽  
Test Organisms ◽  
Inhibition Zones ◽  
Key Words Evaluation ◽  
Klebsiella Spp

Application of disinfectants and antiseptics continue to be an essential part of infection control practices; as such there is the need for constant evaluation of their effectiveness. The study aimed at evaluating the antibacterial effectiveness of some brands of disinfectants and antiseptics against some bacterial isolates. Two disinfectants-D1 (Sodium hypochlorite 3.85%) and D2 (7% Tar acid, phenol, 2% cresylic creosote) and two antiseptics-A1 (Chloroxyenol B.Pc 48%nw/v, oleumpiniaromgticum 8.3%w/w) and A2 (Dichlorometaxylenol, IPA, terpinol) were selected and their efficacies against Staphylococcus aureus, Pseudomonas aeruginosa, Klebsiella spp and Escherichia coli were determined using agar disk diffusion methods. The potency of the disinfectants was further evaluated against phenol to establish the phenol coefficient (Pc). The result revealed that both the disinfectants and the antiseptics inhibited the different test organisms at various concentrations producing higher inhibition zones at higher concentrations (P=0.001) that differ significantly with the type of agent used (P=0.007).Both agents produces higher inhibitions zones against S. aureus, Klebsiella spp, E. coli and the least inhibition zones against P. aeruginosa. At 100% concentration, D1 produces the highest inhibition zone of 21mm against E. coli, while A1produces the highest inhibition zones of 17mm against E. coli, S. aureus and Klebsiella spp. The result indicated that both disinfectants (D1 and D2) are more effective than phenol and that D1 is more effective than D2 with Pc coefficient of 3.0 and 2.0 against S. aureus and P. aeruginosa respectively compared to D2 with a Pc of 2.0 and 1.05 against S. aureus and P. aeruginosa. The study identifies that both disinfectants and antiseptics especially D1 and A1 were effective against the test isolates except for P. aeruginosa which was less susceptible. Key words: Evaluation, Disinfectants, Antiseptics, Bacteria

Note: Effect of Some Spice Extracts on Bacterial Inhibition

2003 ◽  
Vol 9 (5) ◽  
pp. 353-358 ◽  
Author(s):  
O. Sagdic ◽  
A. G. Karahan ◽  
M. Ozcan ◽  
G. Ozkan
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Yersinia Enterocolitica ◽  
Inhibition Zone ◽  
Bacterial Strains ◽  
Inhibitory Effects ◽  
Antibacterial Effects ◽  
E Coli ◽  
Inhibition Zones ◽  
Mrs Broth

Eighteen extracts of spices commonly consumed worldwide and grown naturally in Turkey were tested against twenty three bacterial strains to compare their antibacterial effects with eleven antibiotics. Eight pathogens and fifteen lactobacilli isolated from chick intestine were used as the test microorganisms. Pathogens (six different Staphylococcus aureus strains, Escherichia coli ATCC 25922 and Yersinia enterocolitica ATCC 1501) were grown in Nutrient broth and lactobacilli in MRS broth. Hop extracts formed inhibition zones against S. aureus strains of upto 36 mm. Inhibitory effects of hop extracts against S. aureuswere generally higher than that of erythromycin as antibiotic. Helichrysum compactum extract produced an inhibition zone of 23mm to E. coli ATCC 25922 and 26mm to Y. enterocolitica ATCC 1501. Helichrysum compactum extract inhibited the growth of Y. enterocolitica ATCC 1501 more than other spice extracts. While inhibition zones of these extracts against lactobacilli were found smaller than on S. aureus strains, inhibition zones of the same extracts against lactobacilli were found similar to those of E. coli ATCC 25922 and Y. enterocolitica ATCC 1501.

scholarly journals Etude bactériologique et pathologique de la pneumonie chez le dromadaire (Camelus dromedarius) en Jordanie

2001 ◽  
Vol 54 (2) ◽  
pp. 93 ◽  
Author(s):  
Y. H. Al Tarazi
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Mannheimia Haemolytica ◽  
Camelus Dromedarius ◽  
E Coli ◽  
Actinomyces Pyogenes ◽  
Klebsiella Spp

Les publications concernant la pneumonie chez le dromadaire sont en général rares. Dans cette étude, 284 poumons de dromadaires, abattus entre 6 mois et 10 ans d’âge et provenant du nord de la Jordanie, ont été examinés. La prévalence de la pneumonie a été de 10,2 p. 100. Les lésions pathologiques des poumons atteints de pneumonie ont été classées selon qu’elles indiquaient la présence de la bronchopneumonie proliférative chronique, de la pleuropneumonie chronique ou de la pneumonie interstitielle. Les abcès du poumon ont aussi été enregistrés. La broncho-pneumonie proliférative chronique (20,69 p. 100) et la pleuropneumonie chronique (6,9 p. 100) ont été plus fréquentes chez les dromadaires âgés (10 ans environ), alors que la pneumonie interstitielle (58,6 p. 100) et les abcès du poumon (10,34 p. 100) ont été plus fréquents chez les jeunes dromadaires (âgés de 6 mois à 4 ans). Mannheimia haemolytica et Pseudomonas aeruginosa ont été les espèces les plus fréquemment isolées dans le cas de broncho-pneumonie proliférative chronique et de pleuropneumonie chronique, alors que, dans les cas de pneumonie interstitielle, c’étaient Escherichia coli et Klebsiella spp. qui l’ont été le plus. Dans les cas d’abcès du poumon c’étaient Staphylococcus aureus, Actinomyces pyogenes et des streptocoques hémolytiques qui ont été le plus fréquemment observés. Au total, 75 espèces bactériennes ont été isolées de 29 poumons. Les plus fréquentes ont été E. coli (26,66 p. 100), Klebsiella spp. (14,66 p. 100), Pseudomonas aeruginosa (12 p. 100), Staphylococcus aureus (10,66 p. 100), Mannheimia haemolytica (6,66 p. 100) et Actinomyces pyogenes (6,66 p. 100). L’espèce la plus souvent observée parmi les Klebsiella identifiées a été Klebsiella ozaenae.

scholarly journals Antibacterial Screening Activity of Several Sponges Against Staphylococcus aureus, Escherichia coli, Staphylococcus saprophyticus, dan Pseudomonas aeruginosa

2019 ◽  
Vol 7 (2) ◽  
pp. 455
Author(s):  
Deiske A. Sumilat
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacterial Growth ◽  
Inhibition Zone ◽  
E Coli ◽  
Antibacterial Screening ◽  
Sponge Extract ◽  
Screening Activity

Sponge samples collected around Manado waters were obtained 30 species and their crude extracted have been tested in vitro for their activity in inhibiting bacterial growth. Based on the results of antibacterial screening in 30 sponge extracts, there were 23 sponge extracts which had bioactivity in inhibiting the growth of S. aureus, E. coli, S. saprophyticus and P. aeruginosa, Sponge extract No. 43 (of 30 sponge extracts tested) was the most active in inhibiting bacterial growth and had the widest inhibition zone diameter.Keywords: screening, sponge, crude extract, antibacterial, ManadoABSTRAKSampel spons dikoleksi di sekitar Perairan Manado sebanyak 30 jenis/spesies, dimana ekstrak kasarnya telah diuji secara in vitro aktivitasnya dalam menghambat pertumbuhan bakteri. Berdasarkan hasil skrining antibakteri pada 30 ekstrak spons didapatkan hasil ada 23 ekstrak spons yang mempunyai bioaktivitas dalam menghambat pertumbuhan bakteri S. aureus, E. coli, S. saprophyticus dan P. aeruginosa, Ekstrak spons No. 3 (dari 30 ekstrak spons yang diuji) adalah yang paling aktif dalam menghambat pertumbuhan bakteri dan memiliki diameter zona hambat yang paling lebar.Kata kunci: skrining, spons, ekstrak kasar, antibakteri, Manado

scholarly journals Antibacterial effect of Aqueous Neem (Azadirachta indica) leaf extract, crude neem leaf paste, and Ceftriaxone against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa

2016 ◽  
Vol 3 (1) ◽  
pp. 25-36
Author(s):  
Shamima Sultana ◽  
A. S. M. Shahidullah ◽  
Md. Mahbubul Islam ◽  
A. F. S. A. Wasey ◽  
Shamsun Nahar
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Leaf Extract ◽  
Inhibitory Effects ◽  
Dilution Technique ◽  
E Coli ◽  
Test Organisms ◽  
Broth Dilution

The study was conducted during the period of July 2004 to June 2005 in the   Department of Pharmacology & Therapeutics in collaboration of Department of Microbiology, Mymensingh Medical College, Mymensingh to determine the profile of antibacterial effect of crude neem leaf paste (CNLP), aqueous neem leaf extract (ANLE), and standard antibiotic Ceftriaxone against Staphylococcus aureus, Escherichia coli and, Pseudomonas aeruginosa. Five separate experiments were done e.g. I) Determination of inhibitory effect of crude neem leaf paste (CNLP) by incorporation into nutrient agar media (NA), against Staphylococcus aureus, Escherichia coli and, Pseudomonas aeruginosa. II) Determination of minimum inhibitory concentration (MIC) of aqueous neem leaf extract (ANLE) against that three test organisms by broth dilution technique, III) Determination of minimum inhibitory concentration (MIC) of standard antibiotic ceftriaxcone against test organisms by broth dilution technique as well as making a comparison with MIC of ANLE and IV) Subculture study of materials from effective CNLP, ANLE, NLEE and Ceftriaxone in nutrient agar medium for confirmation of respective results of different experiments conducted. Results revealed that inhibitory effects were observed against the growth of Staph. aureus, Esch. coli and Ps. aeruginosa at 15%, 20% and 25% respectively of CNLP incorporated  into NA media.  The broth dilution technique was followed to determine the MICs of ANLE and Ceftriaxone. The MIC of ANLE was 714 μg/ml against S. aureus and that against E. coli and P. aeruginosa was 1428 μg/ml. The MIC of Ceftriaxone was 10μg/ml against S. aureus and that against E. coli and P. aeruginosa was 25 μg/ml. The MIC of Ceftriaxone was the lowest in comparison to MICs of ANLE. The subculture study showed similar results with that of previous experiments in terms of inhibitory effects of CNLP and MICs of ANLE, Ceftriaxone against all of the organisms studied.  

scholarly journals In vitro Antibacterial Activity of Mometasone Furoate, Fluticasone Propionate and Fluticasone Furoate Nasal Preparations Against Streptococcus pneumoniae, Hemophilus influenzae, Streptococcus viridans, Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli

2010 ◽  
Vol 25 (1) ◽  
pp. 13-16
Author(s):  
Philip Lance A. Liu ◽  
Rose Lou Marie C. Agbay ◽  
Samantha S. Castañeda
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Streptococcus Pneumoniae ◽  
Fluticasone Propionate ◽  
Mometasone Furoate ◽  
Fluticasone Furoate ◽  
E Coli ◽  
Inhibition Zones

Objective: To test the antibacterial properties of three commercially available nasal corticosteroid preparations containing Mometasone Furoate (MF), Fluticasone Propionate (FP) and Fluticasone Furoate (FF) against S. pneumoniae, S. viridans, S. aureus, H. influenza, P. aeruginosa and E. coli. Methods:   Study Design:  Experimental in vitro study using the disc diffusion method.   Clinical isolates of Streptococcus pneumoniae, Hemophilus influenzae, Streptococcus viridans, Staphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli were inoculated on separate plates. 0.15 ml of nasal corticosteroid preparations containing MF, FP and FF were applied to blank paper discs, then placed on the plates, including an empty disc.  Following 24 and 48 hours of incubation, the inhibition zones were measured to the nearest mm from the point of abrupt inhibition of growth. Results: After 24 and 48 hours of incubation, S. pneumoniae, S. viridans, and S. aureus showed inhibition zones to all three preparations. S. aureus and S. viridans show the largest zones of inhibition at 24 and 48 hours respectively. H. influenza, P. aeruginosa and E. coli were negative. The inhibition zones of each bacteria were shown to be statistically different. The preparation containing FP had the largest zone of inhibition at 24 and 48 hours, although post hoc tests showed their difference was not significant. Conclusion: The present study demonstrates possible antimicrobial properties of commercially-available nasal corticosteroid preparations. However, it is unclear whether these can be attributed to the steroids, their excipients, or both. Further studies testing each component may offer better insights into their therapeutic use. Keywords: Mometasone Furoate, Fluticasone Propionate, Fluticasone Furoate, Antibacterial, Nasal Corticosteroids, Allergic Rhinitis, Acute Bacterial Rhinosinusitis

scholarly journals Prevalence of symptomatic urinary tract infection and bacterial spectrum of diabetic and non-diabetic patients at the two teaching hospitals in Enugu, Nigeria

2021 ◽  
Vol 22 (4) ◽  
pp. 480-488
Author(s):  
C.C. Okwume ◽  
N.F. Onyemelukwe ◽  
I.N. Abdullahi ◽  
O.E. Okoyeocha ◽  
S.D. Asamota
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Bacterial Pathogen ◽  
Diabetic Patients ◽  
Isolation Rate ◽  
E Coli ◽  
Enterococcus Spp ◽  
Infections Urinaires ◽  
Klebsiella Spp

Background: Diabetes mellitus is a group of metabolic disorder characterized by relative or absolute lack of insulin. When this condition is not properly managed, it can lead to complications that make diabetic patients vulnerable to urinary tract infections (UTI). The objectives of this study are to determine the prevalence of microbiologically confirmed UTI and the spectrum of uropathogens in diabetic and non-diabetic patients with clinical features of UTI attending the two tertiary hospitals in Enugu State, Nigeria. Methodology: Clean catch specimen of single mid-stream urine sample was collected from each of 60 (22 males, 38 females) diabetic and 60 (22 males, 38 females) non-diabetic patients enrolled using stratified random sampling method. The samples were cultured on standard microbiological culture media (MacConkey and Blood agar plates) and incubated aerobically at 37◦C for 24 hours. Plates with significant bacteria growth (>105 CFU/ml) were processed further for bacterial identification using conventional biochemical test scheme. Antibiotic susceptibility test (AST) of each isolate to 17 selected antibiotics was performed by the modified disc diffusion method. Results: Of the total 120 patients enrolled, 101 had bacterial pathogens isolated from their voided urine samples; 51 of 60 (85.0%) diabetics and 50 of 60 (83.3%) non-diabetics (p=0.802). Bacteria were isolated in 59.1% (13/22) of diabetic and 54.5% (12/22) of non-diabetic male patients compared to 100% (38/38) isolation rate in diabetic and non-diabetic female patients. The most frequently isolated bacteria in the diabetic patients were Proteus spp (18.6%), Klebsiella spp (16.9%) and Escherichia coli (15.5%) while the most frequently isolated bacteria among the non-diabetic patients were E. coli (30.0%), Proteus spp (26.3%) and Enterobacter spp (14.0%). Apart from Klebsiella spp which was more frequently isolated from the diabetic (16.9%) than non-diabetic patients (6%) (p=0.039), the frequency other bacterial pathogen isolation such as Proteus spp, E. coli, Enterobacter spp, Pseudomonas aeruginosa, Staphylococcus aureus and Enterococcus spp was not significantly different between the two population groups (p>0.05). The Gram-positive and Gram-negative bacteria were highly sensitive to imipenem in both diabetic and non-diabetic patients, but the isolates from both study groups exhibited low susceptibility to amoxicillin, nitrofuran- toin, cefixime and cefuroxime. Conclusion: Although the overall frequency of bacterial pathogen isolation in the diabetic and non-diabetic patients was not significantly different, females had a higher pathogen isolation rate than the males, and diabetic females had a higher frequency of polymicrobial infections compared to non-diabetic females and the male population. The high antimicrobial resistance of the isolated bacteria pathogens underscores the need for clinical microbiology laboratory testings to optimize the management of UTI in diabetic patients.   French title: Prévalence des infections urinaires symptomatiques et spectre bactérien des patients diabétiques et non diabétiques dans les deux hôpitaux universitaires d'Enugu, au Nigeria   Contexte: Le diabète sucré est un groupe de troubles métaboliques caractérisés par un manque relatif ou absolu d'insuline. Lorsque cette condition n'est pas correctement gérée, elle peut entraîner des complications qui rendent les patients diabétiques vulnérables aux infections des voies urinaires (UTI). Les objectifs de cette étude sont de déterminer la prévalence des infections urinaires confirmées microbiologiquement et le spectre des uropathogènes chez les patients diabétiques et non diabétiques présentant des caractéristiques cliniques des infections urinaires fréquentant les deux hôpitaux tertiaires de l'État d'Enugu, au Nigeria. Méthodologie: Un échantillon de capture propre d'un seul échantillon d'urine à mi-jet a été prélevé sur chacun des 60 (22 hommes, 38 femmes) patients diabétiques et 60 (22 hommes, 38 femmes) patients non diabétiques inscrits à l'aide d'une méthode d'échantillonnage aléatoire stratifié. Les échantillons ont été cultivés sur des milieux de culture microbiologiques standard (plaques de gélose MacConkey et Blood) et incubés en aérobie à 37°C pendant 24 heures. Les plaques avec une croissance bactérienne significative (>105 CFU/ml) ont été traitées davantage pour l'identification bactérienne en utilisant un schéma de test biochimique conventionnel. Le test de sensibilité aux antibiotiques (AST) de chaque isolat à 17 antibiotiques sélectionnés a été réalisé par la méthode de diffusion sur disque modifiée. Résultats: Sur un total de 120 patients recrutés, 101 avaient des agents pathogènes bactériens isolés de leurs échantillons d'urine évacués; 51 des 60 (85,0%) diabétiques et 50 des 60 (83,3%) des non-diabétiques (p=0,802). Les bactéries ont été isolées chez 59,1% (13/22) des patients diabétiques et 54,5% (12/22) des hommes non diabétiques contre un taux d'isolement de 100% (38/38) chez les femmes diabétiques et non diabétiques. Les bactéries les plus fréquemment isolées chez les patients diabétiques étaient Proteus spp (18,6%), Klebsiella spp (16,9%) et Escherichia coli (15,5%) tandis que les bactéries les plus fréquemment isolées chez les patients non diabétiques étaient E. coli (30,0%), Proteus spp (26,3%) et Enterobacter spp (14,0%). Hormis Klebsiella spp qui était plus fréquemment isolé chez les diabétiques (16,9%) que les patients non diabétiques (6%) (p=0,039), la fréquence d'isolement d'autres agents pathogènes bactériens tels que Proteus spp, E. coli, Enterobacter spp, Pseudomonas aeruginosa, Staphylococcus aureus et Enterococcus spp n'étaient pas significativement différents entre les deux groupes de population (p>0,05). Les bactéries Gram-positives et Gram-négatives étaient très sensibles à l'imipénème chez les patients diabétiques et non diabétiques, mais les isolats des deux groupes d'étude présentaient une faible sensibilité à l'amoxicilline, à la nitrofurantoïne, au céfixime et à la céfuroxime. Conclusion: Bien que la fréquence globale d'isolement des agents pathogènes bactériens chez les patients diabétiques et non diabétiques n'était pas significativement différente, les femmes avaient un taux d'isolement des agents pathogènes plus élevé que les hommes, et les femmes diabétiques avaient une fréquence plus élevée d'infections polymicrobiennes par rapport aux femmes non diabétiques. et la population masculine. La haute résistance antimicrobienne des bactéries pathogènes isolées souligne la nécessité de tests de laboratoire de microbiologie clinique pour optimiser la gestion des infections urinaires chez les patients diabétiques.    

The Characterization of Antibiotic Resistance of Bacterial Isolates from Intensive Care Unit Patient Samples in a University Affiliated Hospital in Romania

2019 ◽  
Vol 70 (5) ◽  
pp. 1778-1783
Author(s):  
Andreea-Loredana Golli ◽  
Floarea Mimi Nitu ◽  
Maria Balasoiu ◽  
Marina Alina Lungu ◽  
Cristiana Cerasella Dragomirescu ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibiotic Resistance ◽  
Bacterial Pathogens ◽  
Resistance Rate ◽  
Resistance Pattern ◽  
Bacterial Isolates ◽  
E Coli ◽  
Acinetobacter Spp ◽  
Almost All ◽  
Klebsiella Spp

To determine the resistance pattern of bacterial pathogens involved in infections of the patients aged between 18-64 years, admitted in a ICU from a 1518-bed university-affiliated hospital. A retrospective study of bacterial pathogens was carried out on 351 patients aged between 18-64 years admitted to the ICU, from January to December 2017. In this study there were analysed 469 samples from 351 patients (18-64 years). A total of 566 bacterial isolates were obtained, of which 120 strains of Klebsiella spp. (35.39%%), followed by Nonfermenting Gram negative bacilli, other than Pseudomonas and Acinetobacter (NFB) (75- 22.12%), Acinetobacter spp. (53 - 15.63%), Pseudomonas aeruginosa and Proteus (51 - 15.04%), and Escherichia coli (49 - 14.45%). The most common isolates were from respiratory tract (394 isolates � 69.61%). High rates of MDR were found for Pseudomonas aeruginosa (64.70%), MRSA (62.65%) and Klebsiella spp. (53.33%), while almost all of the isolated NFB strains were MDR (97.33%). There was statistic difference between the drug resistance rate of Klebsiella and E. coli strains to ceftazidime and ceftriaxone (p[0.001), cefuroxime (p[0.01) and to cefepime (p[0.01). The study revealed an alarming pattern of antibiotic resistance in the majority of ICU isolates.

scholarly journals Fabrication of a Novel AgBr/Ag2MoO4@InVO4 Composite with Excellent Visible Light Photocatalytic Property for Antibacterial Use

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1541
Author(s):  
Jie Zhang ◽  
Jia Wang ◽  
Qingjun Zhu ◽  
Binbin Zhang ◽  
Huihui Xu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Degradation Rate ◽  
Photocatalytic Property ◽  
Photocatalytic Reaction ◽  
Composite Photocatalyst ◽  
E Coli ◽  
Radical Trapping ◽  
Visible Light Photocatalytic

A novel AgBr/Ag2MoO4@InVO4 composite photocatalyst with different heterojunction structures was successfully constructed by compounding InVO4 with Ag2MoO4 and AgBr. According to the degradation, antibacterial and free radical trapping data, the photocatalytic antibacterial and antifouling activities of AgBr/Ag2MoO4@InVO4 composite were evaluated, and the corresponding photocatalytic reaction mechanism was proposed. Adding AgBr/Ag2MoO4@InVO4 composite, the degradation rate of ciprofloxacin (CIP) achieved 95.5% within 120 min. At the same time, the antibacterial rates of Escherichia coli (E. coli), Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) achieved 99.99%. The AgBr/Ag2MoO4@InVO4 composite photocatalyst showed promising usage in photocatalytic antibacterial and purification areas.

scholarly journals ISOLATION AND CHARACTERIZATION OF ACTINOMYCETES FROM SOIL OF AD-DAWADMI, SAUDI ARABIA AND SCREENING THEIR ANTIBACTERIAL ACTIVITIES

2017 ◽  
Vol 9 (10) ◽  
pp. 276 ◽  
Author(s):  
Gouse Basha Sheik ◽  
Muazzam Sheriff Maqbul ◽  
Gokul Shankar S. ◽  
Ranjith M S
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Antibacterial Activities ◽  
Soil Samples ◽  
Streptomyces Sp ◽  
Crude Extracts ◽  
Test Organisms ◽  
Inhibition Zones

Objective: To isolate and characterize novel actinomycetes and to evaluate their antibacterial activity against drug-resistant pathogenic bacteriaMethods: In the present study, 19 soil samples were collected from different localities of Ad-Dawadmi, Saudi Arabia. Actinomycetes were isolated from these samples using serial dilution and plating method on Actinomycetes isolation agar supplemented with nalidixic acid and actidione to inhibit bacteria and fungi. Crude extracts of potential actinomycetes were produced by submerged fermentation. The antimicrobial activity of crude extracts of actinomycetes was tested against different bacteria using the agar well diffusion method. Characterization of the isolates was done by morphological, physiological and biochemical methods.Results: A total of 9 (47%) isolates of actinomycetes were isolated from 19 different soil samples tested. Among them, 4 (44%) isolates confirmed as Streptomyces sp. showed potential antimicrobial activity against one or more test organisms. Crude extracts were made from these 4 actinomycetes isolates(DOM1, DOM3, DP3, DP4)and tested for their antibacterial activities against 4 different clinical bacterial strains (Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Enterococcus). Crude extract from DP3 isolate showed highest antibacterial activity against all the four test organisms (28 mm, 21 mm, 20 mm and 18 mm) respectively and DP4 showed lowest antibacterial activity against all the four test organisms (14 mm, 12 mm, 0 mm, 6 mm) respectively. The highest zone of inhibition was shown by DP3 against Staphylococcus aureus (28 mm) and Escherichia coli was resistant for DP4. Most of the Inhibition zones produced by crude extracts showed significant differences when compared with control, tested against test organisms (P<0.05). Inhibition zones produced by DP3 and DOM1 against Staphylococcus aureus were 28 mm and 23 mm, respectively which were strong active when compared with control Ciprofloxacin (18 mm).Conclusion: Further studies for purification of bioactive metabolites and molecular characterization analysis of isolated Streptomyces sp. are in progress which would be helpful in discovering novel compounds of commercial value.

scholarly journals Estudio fitoquímico y actividad antimicrobiana de plantas medicinales empleadas para el control de infecciones urinarias

2021 ◽  
Vol 16 (1) ◽  
pp. 43-56
Author(s):  
Lida Vanessa Hernández Moreno ◽  
Ludy Cristina Pabón Baquero ◽  
Patricia Hernández-Rodríguez
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Zingiber Officinale ◽  
Taraxacum Officinale ◽  
Portulaca Oleracea ◽  
Uncaria Tomentosa ◽  
E Coli ◽  
Anthoxanthum Odoratum ◽  
Parietaria Officinalis

Las enfermedades infecciosas han sido un desafío para la humanidad. A pesar de los avances en la ciencia, aún muchas infecciones no tienen tratamientos efectivos o los microorganismos han generado resistencia a los antibióticos, de manera que las plantas medicinales son una alternativa de tratamiento y reducción de la resistencia. El objetivo de este estudio fue realizar un análisis fitoquímico preliminar y evaluar la actividad antimicrobiana de doce extractos etanólicos deplantas empleadas en la medicina tradicional colombiana como control de infecciones urinarias (IU). Las especies Anthoxanthum odoratum (grama), Urera caracasana (ortigón), Equisetum bogotenses (cola de caballo), Parietaria officinalis (parietaria), Achyrocline bogotensis (vira vira), Kohleria hirsuta (caracola), Taraxacum officinale (diente de león), Sedum praealtum (siempre viva), Portulaca oleracea (verdolaga), Petroselinum sativum (perejil), Zingiber officinale (jengibre) y Uncaria tomentosa (uña de gato) fueron adquiridas en la plaza de mercado Soacha (Cundinamarca) y sometidas a maceración con etanol a temperatura ambiente. La actividad antimicrobiana se evaluó por difusión en agar, microdilución en placa y bioautografía frente a Escherichia coli (ATCC 25922), Staphylococcus aureus (ATCC 25923) y Pseudomonas aeruginosa (ATCC 9027). Se determino que S. aureus y P. aeruginosa presentaron inhibición frente a cinco extractos en los tres métodos realizados, mientras que E. coli no fue inhibida por ningún extracto. Se estableció mediante bioautografía con reveladores específicos que los esteroides y/o triterpenoides, fenoles y flavonoides son los posibles metabolitos responsables de la actividad. Este tipo de investigaciones propicia estudios orientados al aislamiento de principios activos con utilidad en la elaboración de medicamentos para tratar IU.

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