Minimun Inhibitory Concentration Research Articles

ANTIBACTERIAL EFFECTIVENESS OF RAMBAI (Sonneratia Caseolaris) LEAVES EXTRACT AGAINST STREPTOCOCCUS MUTANS

Background: The 2018 Riskesdas data stated that dental caries prevalence in Indonesia was 88.8%. Dental caries is a multifactorial disease characterized by hard tissue damage to the enamel, dentin, and cementum of the teeth. One of the causes of caries is the presence of a microorganism called Streptococcus mutans. Rambai leaf extract (Sonneratia caseolaris) is a typical plant of South Kalimantan with content flavonoids, tripernoids, tannins, phenols, steroids that have antibacterial properties against the growth of Streptococcus mutans which can prevent caries. Purpose: To determine the difference in the effectiveness of the antibacterial extract of rambai leaves (Sonneratia caseolaris) against bacteria Streptococcus mutans in vitro. Methods: This research was a true experimental with a post-test-only design and a control group, using six treatment groups, namely 20%, 40%, 60%, 80%, positive control (povidone iodine 1%), and negative control (aquadest) respectively. Each treatment got 3 repetitions. The antibacterial test method used in this study was the liquid dilution method to determine the Minimun Inhibitory Concentration (MIC) by using Spectrophotometer and solid dilution to determine the Minimum Bactericidal Concentration (MBC) by using tools Colony Counter. Results: Based on the results and data analysis, it can be seen that the rambai leaf extract has a MIC of 20% and a MBC of 60%. Conclusion: Rambai leaf extract (Sonneratia caseolaris) can inhibit and have antibacterial activity against the growth of Streptococcus mutans. Keywords: Antibacterial, Rambai leaf extract, Streptococcus mutans

Uji Aktivitas Antibakteri Ekstrak Etanol Kulit Kayu Laban (Vitex pubescens Vahl) terhadap bakteri Escherichia coli

Background: In the world, 800.000 children die every year due to diarrheal diseases. Chronic diarrhea is usually caused by a bacterial infection, one of which is E. coli. Empirically, Dayaknese in Sampit, Central Kalimantan consuming Laban bark to treat diarrhea and dysentery. Through this research, people get scientific information about Laban wood as an alternative herbal medicine for treating diarrhea.
 Objective: To find out whether Laban bark can inhibit Escherichia coli bacteria and to determine the minimum inhibitory concentration in Laban bark extract that can inhibit Escherichia coli bacteria.
 Methods: This type of research used true experimental design with research post test only control group design. The research subjects were Escherichia coli cultured on Muller Hinton Agar (MHA) media and Laban bark extract with 3 different concentrations using the disc diffusion method. This study had 2 control groups and 3 treatment groups, DMSO as negative control, ciprofloxacin as positive control and ethanol extract of Laban bark with concentrations of 25%, 50%, and 75%. Inhibition zone diameter results were analyzed quantitatively in 3 replications.
 Results: The results showed that the concentrations of 25%, 50% and 75% of the extract had bacterial inhibition, in the very strong antibacterial category.
 Conclusion: The ethanol extract of Laban bark can inhibit the growth of Escherichia coli with an minimun inhibitory concentration 25%, which is in the very strong inhibition category.
 
 Keywords: Disc diffusion, Escherichia coli, Laban bark (Vitex pubescens Vahl)

Antifungal Activity of Pericopsis (Afrormosia) laxiflora (Benth.) Bark on Ringworm Germs

Dermatophytes are responsible for ringworms that are very often found on the heads of children in Africa. In Côte d'Ivoire, ringworms have been the subject of several studies revealing fairly high frequencies.
 Aims: The present work consisted essentially in studying the antifungal activity of the barks of Pericopsis laxiflora, a plant from the Ivorian pharmacopoeia on germs responsible for ringworm.
 Methodology: The 70% hydroethanolic extract of the bark of Pericopsis laxiflora was prepared and tested on Trichophyton mentagrophytes and Trichophyton rubrum. In addition, by staining and precipitation tests, phytochemical sorting was carried out on this extract.
 Results: Faced with the hydroethanolic extract, Trichophyton mentagrophytes recorded a Minimun Inhibitory Concentration (MIC) which is equal to the Minimun Fungicidal Concentration(MFC) (MIC = MFC = 6.25 mg/mL). For the fungal strain of T. rubrum, the MFC obtained (100 mg/mL) was twice the MIC (50 mg/mL). The phytochemical study of this extract revealed the presence of sterols and polyterpenes, flavonoids and catechic tannins.
 Conclusion: The results suggest that P. laxiflora extract could therefore be useful in the fight against dermatophytes.

Aktivitas Antibakteri Ekstrak Karang Lunak Sarcophyton sp. yang Difragmentasi dan Tidak Difragmentasi dari Perairan Pulau Pramuka, Kepulauan Seribu, Jakarta

Fragmented and non-fragmented soft corals showed antibacterial activities. Soft corals were gradually extracted using methanol, ethyl acetate, and hexane. Crude extract of the samples was tested its antibacterial activity, Minimun Inhibitory Concentration, toxicity (Brine Shrimp Lethality Test method), and phytochemicals. Overall, the antibacterial activity of crude extract of non-fragmented soft coral Sarcophyton sp. was higher than the crude extract of fragmented soft coral Sarcophyton sp. Crude ethyl acetate extract showed higher antibacterial activities. The ethyl acetate crude extract of non-fragmented soft coral Sarcophyton sp. is able to inhibit all tested bacteria is E. coli, S. aureus, P. aeruginosa and B.cereus, while the ethyl acetate crude extract of fragmented Sarcophyton sp. is unable to inhibit bacteria P. aeruginosa. Minimum inhibitory concentration extracts of non-fragmented Sarcophyton sp. in range 240−480 μg/disc. The 24-h LC50 extracts of fragmented and non-fragmented Sarcophyton sp. for Artemia salina were 149.50 ppm and 45.15 ppm, respectively. Bioactive compounds of fragmented and non-fragmented Sarcophyton sp. extract are steroid, flavonoid and alkaloid.

Synthesis of a burkholdine analogue containing β-hydroxytyrosine.

Synthesis of a β-OHTyr-containing Bk analogue, a cyclic octalipopeptide with antifungal activities, is described. Since β-OHTyr-containing peptides generally are unstable in strong acidic conditions, synthesis of β-HOTyr-containing peptides by SPPS have rarely been reported. To overcome this problem, we found that using distilled TFA removed the protecting groups of side chains of β-OHTyr-containing Bk analogue, which was prepared by Fmoc-SPPS. Abbreviations: β-OHTyr: β-hydroxytyrosine; β-OHAsn: β-hydroxyasparagine; Bk: burkholdine; FAA: fatty acyl amino acid; β-MeOTyr: β-methoxytyrosine; SPPS: solid phase peptide synthesis; MIC: minimun inhibitory concentration; DMF: dimethyl formamide; DIPEA: diisopropylethylamine; DIPC: diisopropylcarbodiimide; HOBt: 1-hydroxybenzotriazole; Fmoc: 9-fluorenylmethyloxycarbonyl; HFIP: 1,1,1,3,3,3-hexafluoropropan-2-ol; TFA: trifluoroacetic acid; LAP: N-lauryl -3-amino-4-carbamolypropanoic acid; HPLC: high performance liquid chromatography; ESI-TOFMS: electrospray ionization-time of flight mass spectrometry; Bn: benzyl; Boc: t-butyloxycatbonyl; 2-CTC: 2-chlorotritylchloride.

Konsentrasi Hambat Minimum Ekstrak Daun Sawo (Achras Zapota L.) Terhadap Pertumbuhan Staphylococcus Aureus Secara In Vitro

Sapodilla (Achras zapota L.) is a plant commonly found on the island of Java, West Sumatra and West Nusa Tenggara. Sapodilla plant contains flavonoids, saponins and tannins. In leaf the dominant are flavonoids. The content of flavonoids in the plant tissue may act as an antioxidant and antibacterial. As an alternative natural antibacterial, sapodilla leaves should also be tested minimum inhibitory concentration effective to inhibit the bacteria Staphylococcus aureus. This study aims to determine the minimum inhibitory concentration sapodilla leaf extract (Achras zapota L.) on the growth of Staphylococcus aureus. The research was conducted from January to February 2015 in the Laboratory of Microbiology UNP. Research method is descriptive by observing turbidity levels at each test tube as well as comparison increment Optical Density (OD) before incubation and after incubation of zeroes. Sapodilla leaf extract concentration ranging from 10% - 50%, amoxilin as a positive control, and negative controls (without extract). Study results showed that the minimum inhibitory concentration of Sapodilla leaf extract on the growthbacteria present in a concentration of 50%. Keywords : Sapodilla leaf extract , Minimun Inhibitory Concentration (MIC), and Staphylococcus aureus

Antimicrobial activity of chemically modified dextran derivatives

Cationic amphiphilic dextran derivatives with a long alkyl group attached to the reductive end of the polysaccharide chain and quaternary ammonium groups attached as pendent groups to the main dextran backbone were synthesized and tested for their antimicrobial properties against several bacteria and fungi strains. Dependence of antimicrobial activity on both polymer chemical composition (dextran molar mass, length of end alkyl group and chemical structure of ammonium groups) and type of microbes was highlighted by disc-diffusion method (diameter of inhibition zone) and broth microdilution method (minimum inhibitory concentrations). Polymers had antimicrobial activity for all strains studied, except for Pseudomonas aeruginosa ATCC 27853. The best activity against Staphylococcus aureus (Minimun Inhibitory Concentration 60μg/mL) was provided by polymers obtained from dextran with lower molecular mass (Mn=4500), C12H25 or C18H37 end groups, and N,N-dimethyl-N-benzylammonium pendent groups.

The anthraquinones rubiadin and its 1-methyl ether isolated from Heterophyllaea pustulata reduces Candida tropicalis biofilms formation

BackgroundCandida tropicalis is increasingly becoming among the most commonly isolated pathogens causing fungal infections with an important biofilm-forming capacity. PurposeThis study addresses the antifungal effect of rubiadin (AQ1) and rubiadin 1-methyl ether (AQ2), two photosensitizing anthraquinones (AQs) isolated from Heterophyllaea pustulata, against C. tropicalis biofilms, by studying the cellular stress and antioxidant response in two experimental conditions: darkness and irradiation. The combination with Amphotericin B (AmB) was assayed to evaluate the synergic effect. Study design/MethodsBiofilms of clinical isolates and reference strain of Candida tropicalis were treated with AQs (AQ1 or AQ2) and/or AmB, and the biofilms depletion was studied by crystal violet and confocal scanning laser microscopy (CSLM). The oxidant metabolites production and the response of antioxidant defense system were also evaluated under dark and irradiation conditions, being the light a trigger for photo-activation of the AQs. The Reactive Oxygen Species (ROS) were detected by the reduction of Nitro Blue Tetrazolium test, and Reactive Nitrogen Intermediates (RNI) by the Griess assay. ROS accumulation was also detected inside biofilms by using 2′,7′-dichlorodihydrofluorescein diacetate (DCFH-DA) probe, which was visualized by CSLM. Superoxide dismutase (SOD) activity and the total antioxidant capacity of biofilms were measured by spectrophotometric methods.The minimun inhibitory concentration for sessile cells (SMIC) was determined for each AQs and AmB. The fractional inhibitory concentration index (FICI) was calculated for the combinations of each AQ with AmB by the checkerboard microdilution method. ResultsBiofilm reduction of both strains was more effective with AQ1 than with AQ2. The antifungal effect was mediated by an oxidative and nitrosative stress under irradiation, with a significant accumulation of endogenous ROS detected by CSLM and an increase in the SOD activity. Thus, the prooxidant-antioxidant balance was altered especially by AQ1. The best synergic combination with AmB was also obtained with AQ1 (80.5%) (FICI=0.74). ConclusionUnder irradiation, the oxidative stress was the predominant effect, altering the prooxidant-antioxidant balance, which may be the cause of the irreversible cell injury in the biofilm. Our results showed synergism of these natural AQs with AmB. Therefore, the photosensitizing AQ1 could be an alternative for the Candida infections treatment, which deserves further investigation.

Nationwide survey of Streptococcus pneumoniae drug resistance in the pediatric field in Japan.

Streptococcus pneumoniae is a major causative pathogen of pneumonia in children. The Drug-Resistant Pathogen Surveillance Group in Pediatric Infectious Disease conducted a nationwide surveillance of S. pneumoniae in 2000-2001, 2004, 2007, 2010 and 2012, and investigated changes in drug resistance of S. pneumoniae. All strains of S. pneumoniae were isolated from clinical specimens collected from pediatric patients. The minimun inhibitory concentration was measured and the strains were classified according to the Clinical Laboratory Standards Institute criteria. The isolation rates of penicillin-intermediate resistant S. pneumoniae (PISP) and penicillin-resistant S. pneumoniae (PRSP) were compared based on seven patient factors. Logistic regression analysis was also performed. The sum of the isolation rates for PISP and PRSP for each period was 64.6%, 67.0%, 56.2%, 76.9% and 49.5%, respectively. Among the patient factors, age category 1 (<3 years, ≥3 years), age category 2 (infant, toddler and preschooler, schoolchild), siblings (absence, presence), and pre-treatment with antimicrobial agents (absence, presence) were associated with significant differences in the isolation rate of PISP + PRSP. An interaction was observed between pre-treatment with antimicrobial agents and schoolchild, and the isolation rate of PISP + PRSP was higher in patients with both pre-treatment with antimicrobial agents and schoolchild. Although some changes were observed in the rate of resistance of S. pneumoniae, an increasing trend was not observed. Both pre-treatment with antimicrobial agents and age were associated with resistance, and an interaction was observed between pre-treatment with antimicrobial agents and schoolchild.

PERBANDINGAN EFEKTIVITAS DAYA HAMBAT INFUSUM DAUN SIRIH (PIPERBETIE L) DAN DAUN MENGKUDU (MORINDA CITROFILIA L) TERHADAP PERTUMBUHAN JAMUR CANDIDA ALBICANS

Many people tend to consider using plants for medicine. Beatle’s leaves are contained of some active substance such as kavikol,kavibetol and eugenol while mengkudu’s leave have active substance such as Scalopoetin ,antrhakuinon and saponin that known as antifungi. One of fungi as the main agent of Candidiasis diseases in mouth is Candida albicans. The purpose of study is to compairing the difference inhibitions activity of infusion beatle’s Leaves (Piper beatle L) and infusion mengkudu’s leaves (Morinda citrofilia L) against Candida albicans growth. The Study use dilution method to determine of Minimun Inhibitory Concentration (MIC). This research using 32 sample of infusion beatle’s leaves and infusion mengkudu’s leaves and mixing with Candida albicans and then incubation with Sabouroud Dextrose Broth media. The result is concentration 80% of infusion beatle’s leaves had an inhibitions power against Candida albicans growth. Concentration 100% infusion mengkudu’s leaves had an inhibitions power against Candida albicans growth.The Conclusion of the study is concentration needed of infusion beatle’s leaves low than infusion mengkudu’s leaves for inhibition against Candida albicans growth.

Characterization as Cosmetic Substances of Artemisia argyi H. Extracts

This study was carried out to investigate and verify the functionality of Artemisia argyi H. as cosmetic substances. Antimicrobial activity of water, 60% ethanol and 100% ethanol extracts showed inhibitory effects against Propionibacterium acnes, Staphylococcus aureus, Staphylococcus epidermidis, and Enterobacter aerogenes except Escherichia coli. As the results of MIC(Minimun inhibitory concentration) test, 60% ethanol extracts inhibited the growth of P. acnes at a concentration of 1.25 mg/mL. The mushroom tyrosinase inhibitory activity of water, 60% ethanol, and 100% ethanol extracts of A. argyi H. was increased in concentration-dependent manner. Melanin syntheses of B16/F10 mellanoma cells was also reduced by the extracts of A. argyi H. Especially, 60% ethanol extracts showed a excellent elastase inhibition of 51.9% at 125 ug/mL. In addition, the samples also showed a strong absorption in the range of UV-B(290-320nm). Overall, these results suggest that the extracts of A. argyi H. might be used for cosmetic industry such as anti-wrinkle or whitening substances.

Luliconazole,a novel topical antifungal imidazole

Luliconazole is a novel,optically active,topically applied antifungal imidazole.In vitro and in vivo experimental studies and clinical studies have revealed that luliconazole has a strong wide-spectrum antifungal activity against Dennatophytes spp.,Candida albicans,Malassezia spp.,and some uncommon pathogens including dematiaceous fungi and hyalohyphomycetes.The 50％ minimun inhibitory concentration (MIC50)of luliconazole against Trichophyton rubrum can be as low as 0.00024 μg/ml.In Japan,luliconazole 1％ cream/solution has been approved for the treatment of superficial fungal infections including dermatophytosis,cutaneous candidiasis,and pityriasis versicolor. Key words: Antifungal agents ; Luliconazole ; Safety; Research

Chemical composition of Cymbopogon citratus essential oil and its effect on mycotoxigenic Aspergillus species

This study evaluated the antifungal activity of essential oil of Cymbopogon citratus (Poaceae) against five mycotoxigenic species of the genus Aspergillus (Aspergillus flavus, Aspergillus parasiticus, Aspergillus ochraceus, Aspergillus niger and Aspergillus fumigatus) isolated from maize samples. The oil of C. citratus was obtained by hydro-distillation and analysed by Gas Chromatography – Mass Spectrometry (GC-MS). The oil was dominated by monoterpene hydrocarbons which accounted for 94.25% of the total oil and characterised by a high percentage of geranial (39.53%), neral (33.31%), and myrecene (11.41%). The antifungal activity tests showed that the oil was active against all the five Aspergillus species. The extent of inhibition of fungal growth was dependent on the concentration of the oil. The activity of the oil against the mycotoxigenic fungi had Minimun Inhibitory Concentration (MIC) values ranging from 15 to 118 mg/ml. These results show that the essential oil of C. citratus has antifungal activities against fungi that are the producers of poisonous mycotoxins found in foods. This oil can be used in food preservation systems to inhibit the growth of moulds and retard subsequent mycotoxin production. Key words: A. flavus, A. fumigatus, A. niger, A. ochraceus, A. parasiticus, antifungal.

연안 해역에서 분리한 Vibrio parahaemolyticus에 대한 유기산의 증식억제 효과

This study was carried out to investigate the distribution of V. parahaemolyticus in Incheon adjacent sea, and anti-microbial effect on growth of V. parahaemolyticus in organic acid. The detected strains were compared for geography, months and sample types. V. parahaemolyticus was detected form 28.5 percent of 287 samples collected from Incheon area, and 34.7 percent of 91 samples collected in the months of July through September, and 24.7 percent of 279 shellfish samples respectively. The minimun inhibitory concentration(MIC) of organic acid in V. parahaemolyticus were 1,250ppm at propionic acid, citric acid and acetic acid, 2,500ppm at vanillic acid, respectively. MICs of combined treatment of acetic acid and vanillic acid, citric acid and vanillic acid, propionic acid and vanillic acid were 1,250 ppm. MICs of combined treatment of citric acid and acetic acid, propionic acid and acetic acid, propionic acid and citric acid was 12.5ppm. The antimicrobial effect of organic acid in V. parahaemolyticus was confirmed from the result of this experiment.

Concentração inibitória mínima (CIM) de oito antimicrobianos frente isolados de Streptococcus suis

Avaliou-se a concentração inibitória mínima (CIM) de 75 isolados de Streptococcus suis frente a oito antimicrobianos freqüentemente utilizados no controle da infecção por esse microrganismo. A CIM foi realizada em placas previamente preparadas com ágar sangue, contendo concentrações variando de 0,25 a 256 µg/ml dos seguintes antimicrobianos: amoxicilina, ampicilina, penicilina, ceftiofur sódico, florfenicol, lincomicina, penicilina, sulfametoxazol-trimetoprim e tetraciclina. A amoxicilina nas concentrações de 1 e 2 µg/ml, o florfenicol a 1 µg/ml e o sulfametoxazol-trimetoprim nas concentrações de 2 e 8 µg/ml, foram os antimicrobianos frente aos quais os microrganismos apresentaram menor resistência. Em contraste, a ampicilina, tetraciclina, ceftiofur sódico e lincomicina, foram menos efetivos, apresentando CIM de (64 e 128 µg/ml), (64 e 128 µg/ml), (128 e 256 µg/ml) e (&gt;;256 µg/ml), respectivamente. Os resultados deste estudo demonstram que a amoxicilina e o florfenicol são os antibióticos de escolha para o tratamento de infecções pelo S. suis em suínos.

유기산이 Escherichia coli O157:H7, Salmonella 및 Listeria monocytogenes의 증식에 미치는 영향

The inhibitory effect of the food processing agent on growth of Escherichia coli O157:H7, Salmonella Enteritidis, and Listeria monocytogenes was performed with organic acid, and combination of citric acid, acetic acid, propionic acid and vanillic acid. The minimun inhibitory concentration(MIC) of propionic acid was 5,000 ppm in E. coli O157:H7, 2,500 ppm in Salmonella Enteritidis and Listeria monocytogenes. MIC of citric acid was 10,000 ppm in E. coli O157:H7 and Salmonella Enteritidis, 2,500 ppm in Listeria monocytogenes. MIC of acetic acid was 2,500ppm, while in vanillic acid was 5,000 ppm in Escherichia coli O157:H7, Salmonella Enteritidis, and Listeria monocytogenes. MIC of combined organc acid in E. coli O157:H7 were 2,500ppm in PC, 1,250 ppm in PA, PV, CA, CV and AV. MIC of combined organc acid in Salmonella Enteritidis were 2,500 ppm in PC, PA, PV, CA, and CV, 1,250 ppm in AV. MIC of combined organc acid in Listeria monocytogenes were 1,250 ppm in all treatment group. MIC of combined treatment of three organc acid in E. coli O157:H7, S. Enteritidis and L. monocytogenes were 1,250 ppm in PCA, PCV, PAV and CAV. The inhibitory effect of organc acid in E. coli O157:H7, S. Enteritidis and L. monocytogenes could be confirmed from the result of this experiment. Therefore, it was expected that the food process would increase or maintain by using organic acid.

Efecto antimicrobiano In vitro de propóleos argentinos, colombianos y cubano sobre Streptococcus mutans ATCC 25175

Se evaluó la actividad antimicrobiana de cuatro extractos de propóleos argentinos, cinco colombianos y uno cubano frente a Streptococcus mutans ATCC 25175. La actividad bactericida y bacteriostática fue medida por concentración mínima inhibitoria en un rango entre 0.02 y 15 mg/ml. La totalidad de las muestras analizadas presentaron actividad contra Streptococcus mutans a concentraciones de 15 a 3.75 mg/ml. Los propóleos que presentaron mayor efecto bactericida fueron el 2 y el 3 (muestras colombianas) luego de 48 horas de incubación.El mejor efecto bacteriostático lo presentó la muestra 2 (propóleo colombiano) a un periodo de incubación de 24 horas. El 70% de las muestras de propóleo incrementaron su actividad luego de un tiempo de incubación de 48 horas, en relación con el efecto detectado a las 24 horas. A mayor exposición de las bacterias al propóleo, las muestras colombianas mostraron un efecto superior, las argentinas un efecto moderado y las demás muestras (30%), permanecieron estables.