Antibacterial Activity Of Ethanol Extracts Research Articles

Antibacterial Activity Test of Malacca Leaf Extract (Phyllanthus emblica) Against Staphylococcus aureus and Staphylococcus epidermidis Bacteria

Antibacterials are substances that can interfere with the growth or even kill bacteria and have the side effect of antibacterial resistance. One effort to reduce resistance is choosing to use natural bacterial ingredients. One plant that can potentially contain antibacterial activity is malacca leaves (Phyllanthus emblica). The contents of this plant include flavonoids, alkaloids, tannins, saponins, and steroids/triterpenoids. This research aimed to prove the antibacterial activity test of malacca leaf extract. The stages in this research included phytochemical screening and testing the antibacterial activity of ethanol extract from Malacca leaves for Staphylococcus aureus and Staphylococcus epidermidis bacteria using the diffusion method using paper discs. The characteristics of malacca leaf simplicia obtained were water content of 4.6%, water-soluble content of 28%, ethanol-soluble essence content of 23.33%, total ash content of 2.00%, and insoluble ash content of 0.5%. The results of phytochemical screening showed the presence of flavonoids, saponins, tannins, glycosides, and steroids/triterpenoids. The antibacterial test results of malacca leaf extract at concentrations of 500 mg/ml, 400 mg/ml, 300 mg/ml, and 200 mg/ml have an antibacterial effect against Staphylococcus aureus and Staphylococcus epidermidis, and there is no difference in the effectiveness of the inhibitor against gram-positive and negative grams.

Antibacterial Activity of Ethanol Extract Red (Jatropha gossypifolia) Leaves Against Bacterial Skin Infections by Agar Diffusion

Red Jatropha gossypifolia plant is a type of Jatropha with purplish red leaves which the chemical compounds are found are calcium oxalate, jatroidene, interquinones, flavonoids, flobatin and phenolics, and these compounds can be used as an anticoagulant, anti-inflammatory, analgesic and antibacterial. The aim of this research is to determine the antibacterial activity of red Jatropha leaves ethanol extract against bacteria causes skin infections by Agar Diffusion. The result of screening antibacterial test of red Jatropha leaves ethanol extract with a concentration of 0,1% active against bacteria Staphylococcus aureus, Staphylococcus epidermidis, Propionibacterium acne and Pseudomonas aeruginosa. The result of analysis Minimum Inhibitor Concentration (MIC) and Minimum Bactericidal Concentration (MBC) ethanol extract obtained MIC value = 0.1% to bacteria acid, MBC value = 0.05% to bacteria acid, and the result of antibacterial activity of ethanol extract obtained the largest inhibitory zone diameter at a concentration of 12.8% was 13.577 mm against Staphylococcus aureus.

Evaluation of antibacterial activity of ethanolic extracts of Ruta chalepensis, Hippocratea excelsa, Litsea glaucescens and Waltheria americana against methicillin-resistant Staphylococcus aureus

Evaluation of antibacterial activity of ethanolic extracts of Ruta chalepensis, Hippocratea excelsa, Litsea glaucescens and Waltheria americana against methicillin-resistant Staphylococcus aureus

Antibacterial activity of ethanolic extracts of Thymus vulgaris and Cinnamomum camphora on human pathogenic bacteria.

Antibacterial activity of ethanolic extracts of Thymus vulgaris and Cinnamomum camphora on human pathogenic bacteria.

Antibacterial Activity of Ethanol Extract of Red Spinach Leaves (Amaranthus tricolor L.) Extracted Using Microwave-Assisted Extraction Against Pseudomonas aeruginosa and Streptococcus pyogenes

Background: Humans are among the most susceptible living beings to bacterial infections. Infectious wounds on the skin surface are easily colonized by various kinds of bacteria such as Pseudomonas aeruginosa and Streptococcus pyogenes. Red spinach (Amaranthus tricolor L.) contains flavonoids with antimicrobial properties. Objective: The aim of this study was to determine the antibacterial activity of ethanol extract of red spinach leaves (Amaranthus tricolor L.) against Pseudomonas aeruginosa and Streptococcus pyogenes. Methods: This research includes the preparation, characterization, phytochemical screening of dried powder and extract. Extraction was performed by microwave-assisted extraction (MAE) method using 70% and 96% ethanol variations and then antibacterial activity of ethanol extract of red spinach leaves against Pseudomonas aeruginosa and Streptococcus pyogenes bacteria was carried out by paper disc diffusion method (Kirby-Bauer test) to obtain the diameter of inhibition. Results: The 70% ethanol extract of red spinach leaves has the lowest concentrations of 0.78 mg/ml and 25 mg/ml against Pseudomonas aeruginosa and Streptococcus pyogenes bacteria with diameters of 7.23 mm, and 7.90 mm respectively. While the 96% ethanol extract of red spinach leaves has the lowest concentration of 0.78 mg/ml against Pseudomonas aeruginosa and Streptococcus pyogenes bacteria with a same diameter of 7.43 mm. Conclusion: Ethanol extract of red spinach leaves has antibacterial activity against Pseudomonas aeruginosa and Streptococcus pyogenes.

Growth Inhibiting Activity Of Staphylococcus Aureus ATCC 25923 Kirinyuh Leaves (Chromolaena Odorata L.) Using The Soxhletation Method

Kirinyuh leaves (Chromolaena odorata L.) have the potential as a medicinal plant because of the active compounds contained in kirinyuh leaves (Chromolaena odorata L.). The purpose of this study was to determine the antibacterial activity of ethanol extract of kirinyuh leaves (Chromolaena odorata L.) against the growth of Staphylococcus aureus ATCC 25923 bacteria. Kirinyuh leaf extract (Chromolaena odorata L.) was carried out using the soxhletation method and the solvent used was 96% ethanol. The concentrations used for each treatment were 30%, 40% and 50%. Each concentration was tested for antibacterial activity against Staphylococcus aureus bacteria using the disc diffusion method. The results showed that the extract of kirinyuh leaves (Chromolaena odorata L.) with a concentration of 30% had an average diameter of the inhibition zone of 9.2 mm, a concentration of 40% had an average diameter of the inhibition zone of 12.36 mm, and a concentration of 50% had an average diameter of the inhibition zone of 13.71 mm. The research conducted can be concluded that the extract of kirinyuh leaves can provide the best effect of inhibiting bacterial growth at a concentration of 50% with the results of the anova test p <0.05 which means there is a significant difference compared to other concentrations

Antibacterial Activity of Ethanol Extract from Australian Finger Lime.

Australian finger lime (Citrus australasica L.) has become increasingly popular due to its potent antioxidant capacity and health-promoting benefits. This study aimed to determine the chemical composition, antibacterial characteristics, and mechanism of finger lime extract. The finger lime extracts were obtained from the fruit of the Australian finger lime by the ethanol extraction method. The antibacterial activity of the extract was examined by detecting the minimum inhibitory concentration (MIC) for two Gram-positive and four Gram-negative bacterial strains in vitro, as well as by assessing variations in the number of bacteria for Candidatus Liberibacter asiaticus (CLas) in vivo. GC-MS analysis was used to identify the antibacterial compounds of the extract. The antibacterial mechanisms were investigated by assessing cell permeability and membrane integrity, and the bacterial morphology was examined using scanning electron microscopy. The extract demonstrated significant antibacterial activity against Staphylococcus aureus, Bacillus subtilis, and Gram-negative bacterial species, such as Escherichia coli, Agrobacterium tumefaciens, Xanthomonas campestris, Xanthomonas citri, and CLas. Among the six strains evaluated in vitro, B. subtilis showed the highest susceptibility to the antimicrobial effects of finger lime extract. The minimum inhibitory concentration (MIC) of the extract against the tested microorganisms varied between 500 and 1000 μg/mL. In addition, the extract was proven effective in suppressing CLas in vivo, as indicated by the lower CLas titers in the treated leaves compared to the control. A total of 360 compounds, including carbohydrates (31.159%), organic acid (30.909%), alcohols (13.380%), polyphenols (5.660%), esters (3.796%), and alkaloids (0.612%), were identified in the extract. We predicted that the primary bioactive compounds responsible for the antibacterial effects of the extract were quinic acid and other polyphenols, as well as alkaloids. The morphology of the tested microbes was altered and damaged, leading to lysis of the cell wall, cell content leakage, and cell death. Based on the results, ethanol extracts from finger lime may be a fitting substitute for synthetic bactericides in food and plant protection.

Antibacterial Activity of Ethanolic Extract of Torch Ginger (Etlingera elatior) Towards Enterococcus faecalis: A Preliminary Research to the Alternative of Root Canal Irrigant of Primary Teeth

Enterococcus faecalis is a notable pathogen found in the root canals of primary teeth with endodontic infections, often resistant to conventional root canal irrigation solutions, leading to treatment failure. Torch ginger or kecombrang (Etlingera elatior), a spice plant, is reported to contain bioactive compounds with antibacterial properties. This study investigates the antibacterial efficacy of ethanolic extract of torch ginger against Enterococcus faecalis, evaluating its potential as an alternative irrigant based on minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and effective concentration. Samples included Enterococcus faecalis ATCC® 29212™ and 70% ethanol extract of torch ginger, tested in eight concentrations (80%, 75%, 65%, 50%, 25%, 12.5%, 6.25%, and 3.125%) obtained through maceration, alongside two control groups (NaOCl and saline). The Kirby-Bauer disc diffusion method was employed to determine MIC, while the streaking method from MIC testing identified MBC. Data analysis for MIC and MBC values was conducted using the One-Way ANOVA parametric test (p < 0.05). Torch ginger extract demonstrated antibacterial activity against Enterococcus faecalis, with inhibition observed at a minimum concentration of 3.125% with average inhibition zone diameter of 9.63 ± 0.25 mm and reaching up to 80% concentration with average inhibition zone diameter of 15.03 ± 0.21 mm. The MIC was established at 3.125%, and the MBC among the tested concentrations was 80%. The study concludes that the ethanolic extract of torch ginger shows significant antibacterial activity against Enterococcus faecalis. An 80% concentration is identified as the most effective for inhibiting and killing the pathogen, suggesting its potential as an alternative root canal irrigant of primary teeth.

Testing the Antibacterial Activity of Black Betel Leaf Extract (Piper betle L. Var Nigra) on Streptococcus mutans, Porphyromonas gingivalis, and Enterococcus faecalis

Black betel leaves (Piper betle L. var nigra) are known to have antibacterial effects caused by secondary metabolites such as tannins, phenolic compounds, saponins, flavonoids, alkaloids, and steroids. This study aims to assess the antibacterial activity of ethanol extract of black betel leaves (Piper betle L. var nigra) against S. mutans, P. gingivalis, and E. faecalis by measuring the diameter of the inhibition zone formed. This research is a type of pure experimental research (true experimental) with post test only control group design. This experimental research was conducted using the disc diffusion method in vitro, the bacteria were treated with black betel leaf extract (Piper betle L. var nigra) with a concentration variation of 60%, 70%, 80%, 90%, and 100%. The experiment was repeated three times. The results showed that black betel leaf (Piper betle L. var nigra) had antibacterial activity against two of the three bacteria. This activity was observed through the presence of distinct clear zones around the paper disks. In conclusion, extracts derived from black betel leaf (Piper betle L. var nigra) had antibacterial activity against S. mutans and P. gingivalis bacteria at 70%, 80%, 90%, and 100% concentrations. However, it did not have antibacterial activity against E. faecalis bacteria.

Effect of Nymphaea alba Petal Extract on Multidrug Resistant Bacteria

This study aimed to determine the antibacterial effect of the extract of Nymphaea alba petals, and if antibacterial activities are present then the Minimum Inhibitory Concentration (MIC) of the extract is determined. Currently multidrug resistant bacteria are a major concern for clinicians as most conventional antibiotics do not work against MDR strains and infections with MDR strains are increasing day by day, with many resulting in death. This study focused mainly on the antibacterial activity of ethanol extract. Our study showed that the crude extract is significantly effective against MDR Pseudomonas aeruginosa and Klebsiella pneumoniae with MIC value <0.78 mg/ml. This confirms the effectiveness of this extract against MDR bacteria.

Phytochemical screening and in vitro antibacterial activity of Moringa oleifera (Lam.) leaf extract

The study aimed to investigate the phytochemical constituents and antibacterial activity of ethanolic extract of Moringa oleifera Lam. belonging to family Moringaceae. Moringa oleifera is an interesting plant for its use in bioactive compounds. Ethanol and Distilled water were used as a solvent to extract and to detect the phytochemical constituent’s and to screen its antibacterial activity from the leaves of Moringa oleifera. The phytochemical constituents were screened by qualitative analysis method. The phytochemical screening finds out the presence of terpenoids, phenols, tannins, flavonoids, glycosides, etc. in leaf extract of Moringa oleifera. The antibacterial activity of ethanolic leaf extract of Moringa oleifera was examined against gram positive bacteria (Staphylococcus aureus) and gram-negative bacteria (Escherichia coli). Antibacterial Activity were carried out with ethanolic extract of Moringa oleifera using agar well diffusion method. The present study showed that ethanolic extract of Moringa oleifera showed more potent antibacterial activity against S. Aureus and E. coli.

Antibacterial Activity of Ethanolic Extract of Red Frangipani Flowers (Plumeria rubra L.) on the Growth of the Bacteria Methicillin-resistant Staphylococcus aureus (MRSA)

Introduction: MRSA is an antibacterial resistance problem that requires serious treatment. The limitations of antibacterials make it difficult to treat infections. The development of alternative antibacterial is needed. Objectives: This study shows the antibacterial effect of ethanol extract of Plumeria rubra L. flowers against MRSA bacteria. Methods: This research is a true experimental research with the only post-test control group design. The Kirby-Bauer test method was used to evaluate the antibacterial activity of ethanol extract of Plumeria rubra L. flowers with concentrations of 20%, 40%, and 60% in triplicate. The test bacteria used MRSA ATCC 33591 bacteria. Antibacterial activity was assessed from the diameter of the inhibition zone formed in bacterial cultures on agar media. Results: The inhibition zone were not formed after ethanolic extract of Plumeria rubra L. flowers at various concentrations. These were not antibacterial activity shown from Plumeria rubra L. flowers extract at concentrations of 20%, 40%, and 60%. Conclusions: The ethanolic extract of Plumeria rubra L. flowers does not show antibacterial activity against MRSA bacteria. Keywords: Red frangipani flowers (Plumeria rubra L.), antibacterial activity, MRSA.

Antibacterial activity of ethanol extract of limpasu (Baccaurea lanceolata) pericarpium with the ultrasound assisted extraction method against Propionibacterium acne

Background: Acne, a prevalent skin condition, can arise from factors such as an unhealthy lifestyle, dietary habits, hormonal imbalances, and bacterial infections. Propionibacterium acnes is a notable bacterium responsible for acne. In South Borneo, the pericarpium of the limpasu plant (Baccaurea lanceolata) is traditionally used to treat acne. Objective: This study aims to scientifically validate the empirical antibacterial effects of limpasu pericarpium against Propionibacterium acnes, as reported by the communities in South Borneo. Methods: The ultrasound-assisted extraction (UAE) method was utilized to extract compounds from limpasu pericarpium. The antibacterial activity of the limpasu pericarpium extract was evaluated using the disc diffusion method at concentrations of 20%, 40%, 60%, 80%, and 100% w/v. Clindamycin served as the positive control, and 1% DMSO was the negative control. Results: The lowest concentration (20%) fell within the strong activity category, producing a clear zone diameter of 18.76 mm. Higher concentrations (40%, 60%, 80%, and 100%) demonstrated more potent antibacterial effects, with inhibition zones of 23.23 mm, 26.06 mm, 26.93 mm, and 27.33 mm, respectively. Notably, 60% to 100% concentrations exhibited greater inhibitory effects than the positive control, clindamycin, which had an inhibition zone of 25.23 mm. Conclusion: The study confirms the antibacterial properties of limpasu pericarpium against Propionibacterium acnes, supporting the traditional claims of its efficacy by the South Borneo communities.

Antibacterial activity of Kemloko fruit ethanol extract (Phyllanthus emblica L.) against Staphylococcus aureus and MRSA bacteria

Background: Indonesia is a tropical country, so the prevalence of infectious diseases caused by bacteria remains high. On the other hand, the high use of antibacterial ingredients in Indonesia causes bacterial resistance to existing antibacterial drugs. One of the herbal plants that some people widely use is Kemloko fruit. This study aimed to determine the activity of Kemloko fruit (Phyllanthus emblica L.) ethanol extract against the growth of Staphylococcus aureus and methicillin-resistant Staphylococcus aureus (MRSA) bacteria. Methods: Simplicia of Kemloko fruit were tested for secondary metabolites and characterization test of the simplicia. The antibacterial activity test was carried out using the diffusion method, where the disc paper was immersed in the test solution with the ratio of the test concentration. Results: The results of phytochemical screening showed that the secondary metabolite compounds of Kemloko fruit are alkaloids, flavonoids, steroids, tannins, saponins, and glycosides. Antibacterial activity of ethanol extract of Kemloko fruit with agar diffusion method effectively inhibits S. aureus bacteria, namely at a concentration of 80 mg/ml, the inhibition zone is 14.1 mm, and at a concentration of 100 mg/ml, MRSA bacteria obtained an inhibition zone of 14.3 mm. Conclusions: The ethanol extract inhibits the growth of S. aureus and MRSA.

Phytochemical Screening and Antibacterial Activity of Ethanolic Extracts from Delonix regia Against Laboratory Strains of Diarrheal Bacteria

The present study evaluates the antibacterial efficacy of ethanolic extracts from <em>Delonix regia</em> leaves against diarrhea-inducing bacteria <em>Escherichia coli</em> and <em>Salmonella typhimurium</em>. Preliminary phytochemical screening revealed that <em>D. regia</em> leaves comprise flavonoids, alkaloids, saponins, tannins, phenolics, and terpenoids. Fourier Transform Infrared Spectroscopy (FTIR) analysis identified various functional groups in the <em>D. regia</em> leaf extract, including O-H, C-H, C=O, C=C, C-C, C-O, and C-O-C. Liquid Chromatography-Mass Spectrometry/Mass Spectrometry (LC-MS/MS) analysis further confirmed the presence of 16 distinct compounds comprising amino acids, alkaloids, phenolics, flavonoids, terpenoids, anthraquinones, n-acyl pyrrolidines, and fatty acids. The disc diffusion method (Kirby-Bauer) was employed for the antibacterial tests. The extracts of <em>D. regia</em> leaves at concentrations of 25%, 50%, 75%, and 100% generated inhibition zones measuring 5.26 mm, 6.37 mm, 7.27 mm, and 10.18 mm against <em>E. coli</em>, and 5.05 mm, 7.01 mm, 8.77 mm, and 10.04 mm against <em>S. typhimurium</em>, respectively. The commercial antibiotic ciprofloxacin (a positive control) produced inhibition zones of 30.02 mm for <em>E. coli</em> and 28 mm for <em>S. typhimurium</em>. The negative control, consisting of 10% ethanol, showed no inhibitory effect on bacterial growth. These findings indicate that the ethanolic extract of <em>D. regia</em> leaves possesses antibacterial properties against <em>E. coli</em> and <em>S. typhimurium</em>. It is likely that secondary metabolite compounds, such as flavonoids and phenolics, contribute significantly to the observed antibacterial activity

Antibacterial Activity of Ethanol Extract of Sirih Cina Leaves (Peperomia pellucida) Using TLC-Bioautography and Agar Diffusion Methods

Sirih cina leaf (Peperomia pellucida) is a plant that contains active compounds of alkaloids, terpenoids, tannins, saponins, flavonoids and phenols that have potential antibacterial activity. This research aimed to determine the antibacterial activity of ethanol extract of sirih cina leaves (Peperomia pellucida) using the TLC-Bioautography and Agar Diffusion methods. Sirih cina leaf (Peperomia pellucida) was extracted by maceration and evaporated to obtain a thick extract. Screening test result showed that the extract was active at a concentration of 0.1% against the bacteria Propionibacterium acnes, Staphylococcus aureus and Pseudomonas aeruginosa. The results of antibacterial activity testing using the TLC-Bioautography method using the eluent methanol: chloroform (1:4) showed results with Rf values = 0.94, 0.80, 0.65, 0.54, 0.40, 0.30, 0.21, 0.10 against the bacteria Propionibacterium acnes, Staphylococcus aureus, and Pseudomonas aeruginosa. In determining the MIC, the value obtained was the same for the three test bacteria at a concentration of 0.5%, while the KBM value was at a concentration of 2% for Propionibacterium acnes bacteria, a concentration of 0.5% for Staphylococcus aureus bacteria, and a concentration of 1% for Pseudomonas aeruginosa bacteria. The results of antibacterial activity testing using the Agar Diffusion method obtained the largest inhibitory zone diameter at a concentration of 16% against Propionibacterium acnes bacteria with an inhibitory zone diameter of 23.20 mm, Staphylococcus aureus bacteria with an inhibitory zone diameter of 23.63 mm, and Pseudomonas aeruginosa bacteria with an inhibitory zone diameter. 24.48mm

Antibacterial Activity of Ethanol Extract of Larch Sponge Fruiting Body

Antibiotic resistance in pathogenic bacteria is a worldwide problem. In recent years, there has been increasing interest in the evaluation of plants and fungi with antibacterial activity against various infectious agents. The antibacterial activity of ethanol extract of Laricifomes officinalis (Vill.) Kotl. et Pouzar (Polyporaceae) fruiting body was studied. Activity was assessed using the disk diffusion method. L.officinalis ethanol extract showed high activity against Yersinia pseudotuberculosis, as well as moderate activity against Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, and Staphylococcus aureus. Listeria monocytogenes were not sensitive to ethanol extract of the fruiting body of L.officinalis.

In vitro Antibacterial Activity of Ethanolic Tanao Si Kan Dang RD1 (Cannabis sativa L.) Extracts Against Human Antibiotic-Resistant Bacteria.

<b>Background and Objective:</b> A new strain of cannabis, <i>Cannabis sativa</i> L. Tanao Si Kan Dang RD1, has been approved and registered by the Rajamangala University of Technology Isan, Thailand. The <i>C. sativa</i> is acknowledged for its medicinal properties which demonstrated various therapeutic properties, such as anti-cancer and antibacterial activities. This study aimed to investigate the antibacterial activity of ethanolic extracts from the stems and leaves of the Tanao Si Kan Dang RD1 strain against seven antibiotic-resistant bacteria. <b>Materials and Methods:</b> The primary antibacterial activity of ethanolic Tanao Si Kan Dang RD1 extracts were determined using the disc diffusion method, while the minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) were determined using the broth microdilution method. <b>Results:</b> The largest inhibition zone, measuring 12 mm, was observed in leaf extracts against <i>Pseudomonas aeruginosa</i> 101. The lowest MIC, at 0.78 mg/mL, was obtained from stem extracts against <i>Stenotrophomonas maltophilia</i>. The lowest MBCs, at 12.5 mg/mL, were observed in leaf extracts against <i>Enterococcus faecalis</i>, <i>Acinetobacter baumannii</i>, multidrug-resistant <i>Klebsiella</i> <i>pneumoniae</i>, <i>Stenotrophomonas maltophilia</i> and <i>Pseudomonas aeruginosa</i> 101 and stem extracts against <i>Acinetobacter baumannii</i>, multidrug-resistant <i>Klebsiella pneumoniae</i>, <i>Stenotrophomonas maltophilia</i> and <i>Pseudomonas aeruginosa</i> 101. <b>Conclusion:</b> This study presents a novel finding regarding the antibacterial activity of ethanolic extracts from the leaves and stems of Tanao Si Kan Dang RD1 against antibiotic-resistant bacteria. The potential application of these cannabis plant extracts in the development of antibiotics capable of combating antibiotic-resistant pathogenic bacteria represents a promising strategy to address a significant global health concern.

ANTIBACTERIAL ACTIVITY OF TIN LEAVES (Ficus carica L.) ETHANOL EXTRACT AGAINST THE BACTERIA Salmonella typhi

Tin (Ficus carica L.) is a plant from the Moraceae family that contains phytochemicals including alkaloids, flavonoids, saponins, phenols, steroids, tannins. The purpose of this research was to determine the antibacterial activity of ethanol extract of tin leaves against Salmonella typhi bacteria by using the disc diffusion method. Disc paper containing antimicrobials is placed on a medium that has been planted with microorganisms that will diffuse into the media, the clear area indicates an inhibition of microorganism growth. The concentrations of ethanol extract tin leaves used were 10% and 5%. The strength of antibacterial activity can be seen through the parameter of inhibitory strength. Inhibition area 20 mm or more (very strong), 10-20 mm (strong), 5-10 mm (medium) and 5 mm (less). The results showed that the ethanol extract of tin leaves had strong antibacterial activity.

Antibacterial, bacteriolytic, antibiofilm, and synergistic effects of Curcuma species ethanol extracts with antibiotic against multidrug resistant Pseudomonas aeruginosa

Introduction: Curcuma species have shown antibacterial activity against Pseudomonas aeruginosa. The current study was conducted to analyze the antibacterial activity of ethanol extracts of Curcuma species rhizomes, including Curcuma domestica, C. xanthorrhiza, C. mangga, C. zedoaria, and C. aeruginosa against multidrug-resistant Pseudomonas aeruginosa (MDR P. aeruginosa). Furthermore, the mechanism action of Curcuma species in combination with antibiotic against MDR P. aeruginosa and its chemical component were also investigated. Methods: Determination of minimum inhibitory concentration (MIC) was carried out by the microdilution method. The synergistic effects of the extract and tetracycline were determined by the checkerboard method. The effect of the combination of Curcuma species and tetracycline to prevent bacterial resistance was investigated using inhibition of biofilm formation, permeability of bacterial cell membrane, and EtBr accumulation methods. Gas chromatography-mass spectrometry (GC-MS) analysis was also performed. Results: MIC of C. domestica, C. xanthorrhiza, and C. mangga against MDR P. aeruginosa were 125, 250, and 125 µg/mL, respectively. C. xanthorrhiza ethanol extract (7.8 µg/mL) in combination with tetracycline (1.9 µg/mL) revealed a synergistic activity with Fractional Inhibitory Concentration Index (FICI) value of 0.06. The combination of C. xanthorrhiza ethanol extract and tetracycline showed inhibitory effects on biofilm formation and efflux pump of MDR P. aeruginosa. This combination also had bacteriolytic activity. GC-MS analysis led to the identification of ar-turmerone (11.63%) and xanthorrhizol (11.36%) as the major compounds. Conclusion: Combination of C. xanthorrhiza ethanol extract and tetracycline might be developed as an alternative treatment against MDR P. aeruginosa.