Exploration of Antimicrobial, Antibiofilm and Antiquorum Sensing Activity of the Himalayan Yellow Raspberry (Rubus ellipticus) against Clinical Isolates of Escherichia coli and Staphylococcus aureus

2021 ◽  
Author(s):  
Honeysmita Das ◽  
A.K. Samanta ◽  
Sanjeev Kumar ◽  
P. Roychoudhury ◽  
Kalyan Sarma ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Plant Extracts ◽  
Leaf Extract ◽  
Diffusion Method ◽  
Antibiofilm Activity ◽  
Zone Of Inhibition ◽  
E Coli ◽  
Rubus Ellipticus

Background: Management of ever growing multidrug resistant (MDR) bacteria becomes one of the biggest threats to public health worldwide. The situation is worsening due to lack of new generation antimicrobials in the arsenal of the clinicians. Development of new alternatives to the conventional antimicrobial agents is the need of the hour to control the menace of AMR. Plants based products are attractive alternatives with proven efficacy but needs scientific investigation to explore their potential antimicrobial, antibiofilm and antiquorum sensing activities against major bacterial pathogens of human and animals. The present study was conducted to explore the antimicrobial, antibiofilm and antiquorum sensing activity of aqueous and methanol extracts of leaf, flower, fruit and stem of the Himalayan yellow raspberry (Rubus ellipticus) against clinical isolates of Staphylococcus aureus and Escherichia coli. Methods: E. coli and S. aureus were isolated and identified from diarrhoeic pigs and poultry and mastitic milk of cattle of Mizoram, respectively. Leaf, flower, fruit and stem/bark of R. ellipticus were collected from Mizoram and extracted by methanol and aqueous solvents. The antimicrobial activity and MIC was determined by well diffusion method and 96 wells microtiter plate method, respectively. Antibiofilm activity of plant extracts was determined in 96 well tissue culture plate. Antiquorum sensing activity was determined by disc diffusion method. Result: Methanol leaf extract exhibited antimicrobial activity against S. aureus with 19 mm and 7 mm zone of inhibition at 200 mg/mL and 12.5 mg/mL, respectively. Methanol fruit extract also showed antimicrobial activity against S. aureus only. Highest and lowest activities were observed at 200 mg/mL and 25 mg/mL concentrations with 15 mm and 7 mm zone of inhibition, respectively. No antimicrobial activities by either of the extracts were observed against E. coli isolates. The MIC of R. ellipticus methanol leaf and fruit extracts against S. aureus was 0.203125 mg/mL and 0.8125 mg/mL, respectively. The methanol leaf (86.60%) and stem (85.60%) extracts of R. ellipticus showed significant antibiofilm activity against S. aureus isolates, whereas methanol fruit (89.20%) extracts exhibited antibiofilm activity against E. coli isolates at the concentration of 0.05 mg/mL. Significant antiquorum sensing (QS) activities was exhibited by the methanol leaf extract of R. ellipticus at 200 mg/mL concentration against E. coli. This is the first ever report on antibiofilm and anti QS activities of the R. ellipticus plant extracts against E. coli and S. aureus bacteria.

Antimicrobial Activity of Bidens pilosa Leaves Extracts Against Staphylococcus aureus and Escherichia coli

2021 ◽  
Vol 38 ◽  
pp. 20-24
Author(s):  
S.A. Mohamed ◽  
C. Mathew
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Diffusion Method ◽  
Zone Of Inhibition ◽  
Bidens Pilosa ◽  
Leaf Extracts ◽  
E Coli ◽  
Tract Infections

Resistance against synthetic antimicrobial agents is one of the major global public health challenges that compel scientists to search for alternatives including those of plants origin. Staphylococcus aureus and Escherichia coli are bacteria responsible for a variety of infections and diseases that causes significant morbidity and mortality in humans and animals. E. coli is widely distributed in nature and commonly found in lower gastro intestinal tracts of most warm-blooded animals associated with urinary tract infections and enterocolitis in humans and colibacillosis in poultry. This study was carried out to investigate antimicrobial activity of methanolic leaf extracts of Bidens pilosa against S. aureus and E. coli. Agar well diffusion method was used to assess antimicrobial activity of the leaf extracts at 20%, 50% and 70% concentrations respectively based on measured zone of inhibition. The leaf extracts of Bidens pilosa produced significant zone of inhibition indicating its antimicrobial activity against E. coli and S. aureus. The antimicrobial activity was demonstrated in all concentrations however, the highest zone of inhibition (18.5mm and 32mm) for E. coli and S. aureus respectively was at 70% concentration. The results shows that Bidens pilosa leaf extracts have antimicrobial activity against the tested bacteria and have the potential for further development including identification of active components that can be tested for treatment of E. coli and S. aureus associated conditions.

In vitro Antimicrobial, Antibiofilm and Antiquorum Sensing Activity of Indian Rhododendron (Melastoma malabathricum) against Clinical Isolates of Escherichia coli and Staphylococcus aureus

2021 ◽  
Author(s):  
Honeysmita Das ◽  
A.K. Samanta ◽  
Sanjeev Kumar ◽  
P. Roychoudhury ◽  
Kalyan Sarma ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Leaf Extract ◽  
Antimicrobial Agents ◽  
Clinical Isolates ◽  
Antibiofilm Activity ◽  
Zone Of Inhibition ◽  
Leaf Extracts ◽  
E Coli ◽  
Melastoma Malabathricum

Background: Development and persistence of multidrug resistant (MDR) bacteria is considered to be one of the biggest threats to public health worldwide. Development of new antimicrobial agents and alternatives to the conventional antimicrobial agents to control the menace of AMR is the need of the hour. Plants based products can be effectively explored as potential antimicrobial, antibiofilm and antiquorum sensing agents against major bacterial pathogens of human and animals. This present study was conducted to explore the antimicrobial, antibiofilm and antiquorum sensing activity of aqueous and methanol extracts of leaf, flower, fruit and stem of Melastoma malabathricum against clinical isolates of Staphylococcus aureus and Escherichia coli.Methods: E. coli and S. aureus were isolated and identified from diarrhoeic pigs and poultry and mastitic milk of cattle of Mizoram, respectively. Leaf, flower, fruit and stem of M. malabathricum were collected from Mizoram and extracted by methanol and aqueous solvents. The antimicrobial activity and MIC was determined by using well diffusion method and 96 wells microtiter plate method, respectively. Antibiofilm activity of plant extracts was determined in 96 well tissue culture plate. Antiquorum sensing activity was determined by disc diffusion method.Result: Methanol leaf extract exhibited antimicrobial activity against E. coli but not against S. aureus with 18 mm and 6 mm zone of inhibition at 200 mg/mL and 12.5 mg/mL, respectively. Methanol flower extract showed antimicrobial activity against S. aureus but not against E. coli with 14 mm and 6 mm zone of inhibitions at 200 mg/ml and 12.5 mg/mL, respectively. Similarly, the aqueous leaf extract showed antimicrobial activity against S. aureus but not against E. coli with 12 mm and 6 mm zone of inhibition at 200 mg/mL and 100 mg/mL, respectively. The MIC of M. malabathricum methanol leaf extract against E. coli was 3.125 mg/mL, whereas the MIC value of methanol flower and leaf extracts was 6.25 mg/mL against S. aureus. Antibiofilm activity of M. malabathricum methanol leaf, methanol flower and aqueous leaf extracts was recorded only against S. aureus isolates with maximum inhibition at 0.05 mg/mL concentration. Good antiquorum sensing activities was exhibited by the M. malabathricum methanol leaf, methanol flower and aqueous leaf extracts against S. aureus isolates at 200 mg/mL concentration.

scholarly journals Screening of antimicrobial activity of aqueous and ethanolic extracts of some medicinal plants from Cameroon and assessment of their synergy with common antibiotics against multidrug-resistant uropathogenic bacteria.

2021 ◽  
Author(s):  
Mbarga Manga Joseph Arsene ◽  
Podoprigora Irina Viktorovna ◽  
Anytoulou Kitio Linda Davares ◽  
Mouafo Hippolyte Tene ◽  
Irma Aurelia Monique Manga ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Klebsiella Oxytoca ◽  
Diffusion Method ◽  
Distilled Water ◽  
Strong Activity ◽  
E Coli ◽  
Ethanolic Extracts ◽  
Uropathogenic Bacteria

Background and aim: The Cameroonian flora abounds in plants with multidimensional therapeutic virtues which can play an important role in the fight against resistance to antibiotics and the search for new antimicrobials. This study aimed to screen the antimicrobial potential of aqueous and ethanolic extracts of thirteen (13) samples (Bark, leaf, seed) of eight (8) plants from Cameroon against 3 reference pathogens and to evaluate their synergy with conventional antibiotics against eleven (11) multiresistant uropathogenic (MRU) bacteria. Method: Bioactive compounds were extracted from leaves of Leucanthemum vulgare, Cymbopogon citratus (DC.) Stapf, Moringa oleifera Lam and Vernonia amygdalina Delile; barks of Cinchona officinalis and Enantia chlorantha Oliv; barks and seeds of Garcinia lucida Vesque and leaves and seeds of Azadirachta indica (Neem) using distilled water and ethanol as solvents. The extracts were tested against Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 6538 and Candida albicans 10231 using the well diffusion method and the microdilution method. The synergistic effect was assessed (using disc diffusion method and the checkerboard method) against MRU bacteria namely Achromobacter xylosoxidans 4892, Citrobacter freundii 426, Enterococcus avium 1669, Escherichia coli 1449, Klebsiella oxytoca 3003, Kocuria rizophilia. 1542, Moraxella catarrhalis 4222, Morganella morganii 1543, Pseudomonas aeruginosa 3057, Staphylococcus aureus 1449 and Streptococcus agalactiae 3984. Results: We found that distilled water extracted a more important mass of phytochemical compounds (7.9-21.2%) compared to ethanol (5.8-12.4%). Except C. officinalis and G. lucida leaves, the rest of extracts were active with inhibition diameters (ID) ranging from 5 to 36 mm. Both ethanolic (EE) and aqueous extract (AE) of E. chloranta bark (ECB) were the most active against all pathogens with the mean ID of 17 and 36 mm vs S. aureus ATCC 6538, 23 and 14 mm vs E. coli ATCC 25922 and 36 and 19 mm vs C. albicans ATCC 10231. Only the EE of E. chloranta bark (ECB) had a strong activity against all the microorganisms tested (MIC <2 mg / ml); L. vulgare leaves (LVL) and G. lucida seed (GLS) had moderate (average MIC of 8 mg/ml) while all other extracts showed very weak antimicrobial activity. In addition, the fractional inhibitory concentration (FIC) ranged from 0.125 to 0.750. No antagonism (FIC> 4) or indifference (1≤ FIC≤4) was noted between the extracts and the antibiotics, but the best synergies were found with ECB which well-modulated Kanamycin (FIC = 0.125 against S. aureus and 0.250 against E. coli), nitrofurantoin (FIC = 0.250 against S. aureus and 0.188 against E. coli) and ampicillin (FIC = 0.125 against E. coli). Similarly, compared to other extracts, ECB, LVL and GLS also well-modulated ampicillin, ceftazidime, tetracycline, nitrofurantoin, and trimethoprim against all the above-mentioned resistant uropathogenic bacteria with important increase in fold area (IFA). Conclusion: This study show that E. chlorantha bark, L. vulgare leaves G. lucida seed, have good antimicrobial activity against both bacteria (Gram positive and Gram negative) and fungi (C. albicans); and should be more investigated for their possible use to the fight against MDR and MRU microorganisms.

scholarly journals CHARACTERIZATION OF LACTIC ACID BACTERIA AND ANTIMICROBIAL ACTIVITY IN SUI WU’U FROM BAJAWA DISTRICT, NUSA TENGGARA TIMUR, INDONESIA

2020 ◽  
pp. 44-49
Author(s):  
ROSALINA YULIANA AYEN ◽  
ENDANG KUSDIYANTINI ◽  
SRI PUJIYANTO
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
16S Rrna ◽  
Diffusion Method ◽  
E Coli ◽  
Query Cover

Objective: This research aimed to isolate, determine the characteristics of lactic acid bacteria (LAB) of Sui Wu’u from Bajawa, Nusa Tenggara Timur and identify LAB using 16S rRNA potential as antimicrobial activity against pathogenic bacteria. Methods: Sui Wu’u which has been stored for 6 months was obtained from Bajawa district, inoculated on de Man Rogosa-Sharpe Agar (Merck) + 0.5% CaCO3, purification of LAB, characterization of selected isolates, biochemical test, tolerance test for pH, viability to test temperature, and content NaCl, determination of antimicrobial action by the agar well disk diffusion method using antibiotic (Amoxicillin) as a control and as indicator bacteria (Staphylococcus aureus and Escherichia coli) and isolation of genomic 16S rRNA; molecular identification. Results: Based on research results obtained five isolates of LAB, Gram staining the LAB isolated from Sui Wu’u showed that the isolated bacteria (bacilli and coccus) are Gram-positive, catalase-negative and the isolates have tolerance of viability at temperatures of 10°C, 45°C, and 50°C and to salinitas of 4% and 6.5%. The inhibitory zone LAB isolates (2PKT) against E. coli bacteria (20 mm) and S. aureus (12 mm), and (2PKB) against E. coli bacteria (17 mm) and S. aureus (10 mm). The two selected isolates were identified as Lactobacillus fermentum strain HB bacteria with 100% identification value and 98.93% query cover and L. fermentum strain HT with 100% identification value and 99.23% query cover. Conclusion: L. fermentum from Sui Wu’u has antibacterial activity against Staphylococcus aureus and Escherichia coli.

scholarly journals Germicidal Activities of Some Selected Disinfectants on Staphylococcus aureus and Escherichia Coli

2020 ◽  
Vol 5 (2) ◽  
pp. 1-5
Author(s):  
Celestina MI
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Inhibitory Activity ◽  
Diffusion Method ◽  
Zone Of Inhibition ◽  
E Coli ◽  
Test Organisms ◽  
And Staphylococcus Aureus ◽  
Mic Value ◽  
Pathogenic Infection

The germicidal efficacy of four common disinfectants used for different purposes was tested against two common pathogens namely Escherichia coli and Staphylococcus aureus . The disinfectants (Dettol, Jik, Izal and Purit) were diluted with sterile distilled water to achieve different concentrations (100%, 50%, 25%, 12.5% and 6.25%) and they were tested on the two organisms using Agar well diffusion method. The plates were allowed to incubate for 24 hours at 37°C.The germicidal efficiency of the disinfectants was evaluated by measuring the zone of inhibition of each disinfectant based on their varying concentrations. Dettol was observed to have the highest inhibition at 100% concentration and was more germicidal on E. coli than S. aureus with Minimal Inhibitory Concentration (MIC) value of 1:16 dilution against the two test organisms. This was closely followed by Jik which also showed more inhibitory activity against E. coli at the initial concentration recording the second highest inhibition rate compared to other disinfectants, but its efficacy decreased as the concentration dropped. Jik exhibited MIC value of 1:8 and 1:2 dilutions for Staphylococcus aureus and Escherichia coli respectively. Purit showed more inhibitory activity on S. aureus with 3.8mm zone of inhibition as against 1.3mm at 100% concentration, recording MIC value of 1:8 dilution on S. aureus and 1:16 dilution for E. coli . The disinfectant Izal was observed to be the lowest as it did not inhibit the growth of any of the organisms, indicating resistance of the organisms to the disinfectant at all concentrations. All the disinfectants apart from Izal inhibited the two test isolates. Only Dettol proved to be best among them. Therefore, Dettol is encouraged to be used in homes to prevent pathogenic infection.

scholarly journals Efficacy of Caryocar brasiliense Camb. and Annona crassiflora Mart. leaves in the reduction of biotransferred Escherichia coli from Lactuca sativa L. leaves to polypropylene

2021 ◽  
Vol 10 (17) ◽  
pp. e124101724268
Author(s):  
Larissa Lorrane Rodrigues Borges ◽  
Alécia Daila Barros Guimarães ◽  
Fanciellen Morais-Costa ◽  
Eduardo Robson Duarte ◽  
Márcia Martins ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Plant Extracts ◽  
Diffusion Method ◽  
Minimal Inhibitory Concentrations ◽  
E Coli ◽  
Lactuca Sativa L ◽  
Caryocar Brasiliense ◽  
Agar Diffusion Method ◽  
Annona Crassiflora

The antimicrobial activity of Caryocar brasiliense and Annona crassiflora leaves extracts was evaluated against Escherichia coli strains through a sensitivity test by the agar diffusion method and by the evaluation of minimal inhibitory concentrations (MIC) and minimal bactericidal concentrations (MBC) by the microdilution technique followed by plating. The sanitizing efficiency of these extracts in reducing E. coli cells biotransferred from L. sativa leaves to polypropylene surfaces was evaluated after an exposure time of 5 minutes. All strains were sensitive to antibacterials and the formation of an inhibition halo was observed for the extracts against all strains tested. The C. brasiliense extract showed better antimicrobial action against E. coli strains, with a MIC of 1.09 mg/mL, while the MIC of A. crassiflora extract was 5.58 mg/mL. No MBC was found for plant extracts. The strains were not able to form biofilms under the conditions studied, however, there was biotransfer and adhesion of E. coli to polypropylene. The highest counts of E. coli cells biotransferred and, consequently, adhere to the polypropylene coupons were observed when 5 log CFU/mL was inoculated, with a mean count of 4.53 ± 0.66 log CFU/cm2. It was verified that the treatment with the extract solutions in the minimum inhibitory concentrations (MIC) totally reduced the number of E. coli cells adhered to the polypropylene coupons. The results obtained indicate that the use of extracts from both species as antibacterials is promising.

scholarly journals Antibacterial activity and toxicological evaluation of Anogeissusleiocarpus and Psidium guajava on Escherichia coli and Staphylococcus aureus

2021 ◽  
Vol 14 (1) ◽  
pp. 214-220
Author(s):  
S.A. Yabo ◽  
S.B. Manga ◽  
A.S. Baki ◽  
R.F. Atata ◽  
S. Gambo ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antibacterial Activity ◽  
Leaf Extract ◽  
Diffusion Method ◽  
Potential Candidate ◽  
Toxicological Evaluation ◽  
E Coli ◽  
Function Tests ◽  
And Staphylococcus Aureus

The study was carried out to determine the antibacterial activities and toxicological evaluation of Anogeissusleiocarpus and Psidiumguajava on Escherichia coli and Staphylococcus aureus isolated from clinical samples. The plants leaves were extracted using Hexane, Methanol, Ethanol and Water. Various concentrations (50, 25, 12.5 and 6.25mg/ml) of the crude extract of the plants were prepared and their antibacterial activity against Staphylococcus aureus and E. coli was determined using Agar well (Diffusion) method. Toxicity of the plants was evaluated, acute toxicity test, kidney and liver function tests. The result revealed that at 50mg/ml concentration, the leaf extract of Psidiumguajava was active against Staphylococcus aureus and E. coli exhibiting the highest zones of inhibition of 19mm and 9mm respectively. Whereas The leaf extract of Anogeissusleiocarpus only inhibited the growth of Staphylococcus aureus recording highest zone of inhibition of 15mm at a concentration of 50mg/ml. The plant extracts were found to be non-toxic as the LD50  was above 5000mg/kg and the biochemical parameters evaluated for both liver and kidney function tests revealed values that are within normal range. Hence the study established that consumption of the leaves of P.guajava for medicinal purpose can be said to be innocuous, as such the plant could be regarded as a potential candidate in the search of potent and harmless plants of therapeutic value.

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.

TiO2 antifouling coating based on epoxy-modified tung oil waterborne resin

2021 ◽  
pp. 096739112110111
Author(s):  
Hailiang Hu ◽  
Minmin Chen ◽  
Mengye Cao
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Survival Rate ◽  
Light Irradiation ◽  
Fouling Resistance ◽  
Tung Oil ◽  
E Coli ◽  
Antifouling Coating ◽  
Waterborne Epoxy

The eco-friendly functionalized TiO2/polymer antifouling (AF) coating was successfully synthesized by dispersing TiO2 nanoparticles in waterborne epoxy-modified tung oil resin. The AF effectiveness of coating was evaluated toward Staphylococcus aureus ( S. aureus, ATCC6538), Escherichia coli ( E. coli, ATCC8739) and diatom ( Cyclotella sp., FACHB-1635). The nanoTiO2/polymer AF coating showed good antimicrobial activity both under the light and dark conditions by comparison with the pristine TiO2 nanoparticles and bulk polymer. Under light irradiation for 50 min, the AF coating showed only 8.4% and 8% survival rate for S. aureus and E. coli. In addition, The AF coatings exhibited favorable inhibition efficacy toward the growth and adhesion of Cyclotella sp., and the efficacy was enhanced with the increase of TiO2 content. It can be concluded that TiO2 nanoparticles endow the AF coatings with promoted fouling resistance properties.

scholarly journals IN VITRO ANTIMICROBIAL ACTIVITY OF ROOT EXTRACT OF CLITORIA TERNATEA

2017 ◽  
Vol 10 (11) ◽  
pp. 52
Author(s):  
Amita Shobha Rao ◽  
Shobha Kl ◽  
Prathibha Md’almeida ◽  
Kiranmai S Rai
Keyword(s):  
Antimicrobial Activity ◽  
Resistant Strain ◽  
Multidrug Resistant ◽  
Diffusion Method ◽  
Root Extract ◽  
Alcoholic Extract ◽  
Zone Of Inhibition ◽  
Gram Negative ◽  
E Coli ◽  
Multidrug Resistant Strain

  Objective: Infections caused by Gram-negative bacteria are important causes of morbidity and mortality. Extracts of plants and herbs such as Clitorea ternatea are used as diuretic. This work attempts to find out antimicrobial activity of aqueous and alcoholic extract of C. ternatea roots against Pseudomonas aeruginosa (ATCC 27853), Escherichia coli (ATCC 25922), clinical strains of Klebsiella pneumoniae, and Candida albicans.Methods: The agar well-diffusion method was done using Mueller Hinton agar and Sabouraud’s dextrose agar. The microorganism grown in peptone water was inoculated into culture medium. 4 mm diameter well punched into the agar was filled with 20 μl of aqueous and alcoholic root extracts C. ternatea extracts in various concentrations (100-25 μg/ml). The plates were incubated and antimicrobial activity was evaluated.Results: Aqueous root extract of C. ternatea with the concentration of 100 μg/ml showed zone of inhibition against E. coli (ATCC 25922) 18 mm, P. aeruginosa (ATCC 27853) 14 mm, multidrug resistant strain of K. pneumoniae 15 mm. Alcoholic extract of C. ternatea with the concentration of 100 μg/ml showed zone of inhibition of 35 mm against E. coli (ATCC 25922), P. aeruginosa (ATCC 27853) 22 mm, and multidrug resistant strain of K. pneumoniae 28 mm. C. albicanswas resistant to both extract of C. ternatea root. Conclusions: Alcoholic extract of C. ternatea is a better antibacterial agent against multidrug resistant Klebsiella species and other Gram-negative pathogens. Further, studies are required to identify active substances from the alcoholic extracts of C. ternatea for treating infections.

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