Antifungal Activity Test Research Articles

IN VITRO EVALUATION OF ANTIMICROBIAL AND ANTIOXIDANT ACTIVITY OF CARICA PAPAYA L. SEEDS GROWN IN THE REPUBLIC OF YEMEN

This study aimed to investigate the phytochemical, antimicrobial, and antioxidant activities of Carica papaya L. seeds extracts collected from Al Hudaydah city, Yemen (Latitude: 14°47′52″ N Longitude: 42°57′16″ E) during the months of January and February 2021.
 The seed was extracted with different solvents by the cold percolation method. The disk diffusion method was employed to assess the antibacterial activity of the seed extract against six bacterial and four fungal strains. Spectrometric methods were employed to calculate the total alkaloids, anthocyanin, flavonoid, phenolic, quinones, saponin, steroids, terpenoid, tannin, and phenols contents, as well as the antioxidant activities.
 Antibacterial and antifungal activity tests exhibited that the selected microorganisms are highly sensitive to the ethanolic and methanolic extracts of C. papaya L. seeds, followed by chloroform, water, and n-hexane extracts. The samples also demonstrated a significant DPPH, FRAP, and APTS radical scavenging activity. Additionally, the preliminary phytochemical analysis revealed the presence of flavonoid, terpenoid, saponin, alkaloids, steroids, quinones, anthocyanin, tannin, and phenols, all of which potentially contribute to the antimicrobial activities of C. papaya L. seeds.

Chemical Composition, Antibacterial and Antifungal Activity of the Essential Oil from Cistus ladanifer L.

Cistus ladanifer L. is a plant widely used in folk medicine to treat various illnesses. This study aims to evaluate the effect of the plant flourishing time harvest on the chemical composition and the antimicrobial effect of its essential oil. Chemical analysis of the essential oil was carried out using gas chromatography-mass spectrometry (GC-MS). The antibacterial and antifungal proprieties were tested against four selected bacteria (Staphylococcus aureus, Salmonella Typhi, Escherichia coli, and Acinetobacter baumannii) and nine fungi (Yeasts (Candida tropicalis, Candida glabrata, Candida dubliniensis, Candida sp., Rhodotorula rubra, Cryptococcus neoformans) and molds (Penicillium sp. (P), Fusarium sp. (F), Aspergillus niger (A. niger)), respectively. The essential oil of C. ladanifer demonstrated a powerful antibacterial activity with an inhibition zone of 55 ± 0.22 mm for Staphylococcus aureus, 42 ± 0.11 mm for Escherichia coli, 35 ± 0.27 mm for Acinetobacter baumannii (Full resistant to antibiotics) and 30 ± 0.25 mm for Salmonella Typhi. It also inhibited all tested bacteria at 10 µL/mL. For the antifungal activity test, C. tropicalis and C. neoformans appeared to be the most sensitive strains to the essential oil with an inhibition zone of 13 mm, followed by R. rubra and Penicillium sp. (12 mm), then C. dubliniensis and C. glabrata (11 mm). The chemical analysis of the essential oil by GC-MS revealed that the major components of the essential oil were viridiflorol (17.64%), pinocarveol (11.02%), bornylacetate (9.38%), and ledol (8.85%). C. ladanifer exhibited a remarkable antimicrobial activity that could be more exploited to develop targeted natural remedies against specific diseases.

Uji Aktivitas Anti Jamur Ekstrak Etanol Biji Alpukat (Persea americana Mill) Terhadap Jamur Kulit Tricophyton rubrum ATCC 28188, Epidermophyton floccosum ATCC 50266 dan Micospprum canis ATCC 32699)

Antifungal activity test of avocado seed extract (Persea americana Mill) against fungi that cause dermatophytosis skin disease, namely Trichophyton rubrum ATCC 28188, Epidermophyton floccosum ATCC 50266 and Microsporum canis ATCC 32699. Phytochemical test results of avocado seeds contain phenolic compounds, saponins, alkaloids, flavonoids. The antifungal activity test of ethanol extract of avocado seeds used the agar diffusion method, with a concentration of 26,25%, 48,75%, 75%, and the positive control used was ketoconazole and ethanol distillate negative control. The results showed that the diameter of the zone of inhibition against the fungus Trichophyton rubrum ATCC 28188 with an inhibition zone diameter of 7.5 mm, 9.8 mm, 12 mm, against the fungus Epidermophyton floccosum ATCC 50266, the inhibition zone diameter was 7.4 mm, 9, 7 mm, 11.7 mm and against fungi Microsporum canis ATCC 32699 the inhibition zone was 8.4 mm, 10.1 mm, 13.4 mm. It can be concluded that the ethanol extract of avocado seeds has antifungal activity against. Trichophyton rubrum ATCC 28188, Epidermophyton floccosum ATCC 50266 and Microsporum canis ATCC 32699 The greatest antifungal activity was against Microsporum canis at a concentration of 75% with a diameter of 13.4 mm in the strong category

PREPARATION AND ANTIFUNGAL ACTIVITIES OF CHITOSAN FROM APPLE-SNAIL (Pila ampullacea) SHELLS AS PRESERVING AGENT FOR POSTHARVEST PODANG MANGO (Mangifera indica L.) cv Podang

Podang mango, an endemic mango from Kediri, has a short post-harvest shelf life that accelerates by physiological factors and pathogenic fungal contamination. Chitosan reported as an active compound for coating. The apple-snail was reported to contain chitosan in its shell. The purposes of this study are to synthesis chitosan from Pila ampullacea, examine anti-fungal activities to Fusarium oxysporum and Aspergillus ochraceus, and verify the effect of chitosan coating on shelf life and quality of Podang mango. The effect of chitosan coating on fruit quality was analyzed using three treatments which were negative control, chitosan, and chitosan-gelatin with 3 replications. The parameters measured were color, texture, aroma, water content, vitamin C, and weight loss. Results showed that chitosan synthesized from P. ampullacea had 53.56 degrees of deacetylation. Antifungal activity test of chitosan 2% had the highest inhibitory activity against F.oxysporum and A.ochraceus growth with 14.46 mm and 10.33 mm inhibition zone. Coating with chitosan statistically affected fruit quality for 14 days of storage (sig <0.05). Chitosan-gelatin coating is the best treatment in reducing weight loss (8.97%), maintain aroma (sweet fragrance), texture (soft), water content (84%), and vitamin C (0.182%), while the color (reddish yellow) was more influenced by Chitosan coating. Chitosan coated with gelatin is recommended for application on Podang mangoes.

Innovation Approach -Preparation of Lemon Wood Charcoal Finishing with Natural Materials

Charcoal are of natural origin has anti-odour properties by controlling the metabolism of odour causing bacteria and fungi. In the present study, charcoal prepared from natural sources are finished on to natural cotton and bamboo fabrics with the aim of developing anti-odour fabrics. Finished fabrics were subjected to anti-odour testing using modified artificial sweat studies against the test bacterial specimens (Staphylococcus aureus and Micrococcus luteus). The infection associated with odour causing organisms were considered significant and hence the antibacterial and antifungal activity was tested using standard EN ISO 20645 test method and AATCC-30 test method respectively. No fungal organism was recorded for all the test specimens finished with lemon charcoal finished fabrics. Antibacterial and antifungal activity test also revealed the efficacy of charcoal finished fabrics in terms of inhibitory zones against the test organisms. This study would be considered highly significant by providing an eco-friendly and sustainable products for different fields of applications by developing charcoal from waste recycle process.

ANTIFUNGAL EVALUATION OF DICHROSTACHY cinerea (LEAVES AND STEM) EXTRACTS AGAINST SOME DERMATOPHYTES

This study was carried out to evaluate the antifungal efficacy of Dichrostachys cinerea extracts against some isolates of dermatophytic fungi. The powdered plant materials were extracted via soxhlet extraction technique using methanol, dichloromethane and petroleum ether as extraction solvents. The extracts were subjected to phytochemical screening for qualitative detection of plant secondary metabolites. The extracts were further tested for antifungal activity against human isolates of Microsporum canis, Trichophyton terrestre, Trichophyton mentagrophytes and Trichophyton verrucosum. The results of phytochemical screening showed the presence of some secondary metabolites including; alkaloids, tannins, saponins, glycosides and steroid. Antifungal activity testing indicated that all the extracts were active against the isolates tested with the exception of T. verrucosum. Pet ether extracts showed the least activity as reflected in the zone of inhibition (24 mm at 50 mg/ml), against the isolates compared to methanol (30 mm at 25 mg/ml) and dichloromethane (30 mm at 50 mg/ml) extracts. The findings of this study, indicated that the plant is a potential for the drug candidate for the treatment of dermatophytic diseases and support the claim for their traditional use against skin diseases

In silico molecular docking studies of oxadiazole and pyrimidine bearing heterocyclic compounds as potential antimicrobial agents.

Microbial resistance is a major problem faced by the scientific community. It has created an urgent need to develop antimicrobial agents with novel structures and mechanisms of action. With this aim, a series of novel 1,3,4-oxadiazoles bearing 3,4-dihydropyrimidine heterocyclic motifs 4a-l were designed and synthesized. One-pot Biginelli synthesis is pivotal due to the use of readily available chemicals, shorter reaction time, and ecofriendly synthesis with a good yield. The structures of the synthesized molecules were characterized and confirmed by infrared, 1 H nuclear magnetic resonance (NMR), 13 C NMR, and mass spectroscopic techniques. The title compounds were screened against Gram-positive and -negative strains of bacteria and fungi using the Mueller-Hinton broth method. Compound 4d was found to be the most promising against Escherichia coli (12.5 µg/ml), whereas the same compound showed good activity against Staphylococcus aureus at a concentration of 50 µg/ml. Other compounds of the same series, 4c and 4h, displayed moderate activity against Streptococcus pyogenes at a concentration of 50 µg/ml. Furthermore, results of the antifungal activity tests revealed that compound 4i showed promising activity against all the strains of fungi, Candida albicans, Aspergillus niger, and Aspergillus clavatus, at concentrations of 100, 50, and 100 µg/ml, respectively. Molecular docking also showed that these compounds had a significant binding affinity (Glide docking score: -7.74 to -6.531) for DNA gyrase, engaging in a series of bonded and nonbonded interactions with residues lining the active site. The results of molecular docking study validated the experimental findings, thereby providing an initiation mark to optimize this motif using a structure-based drug design approach.

Synthesis and charcterization of Cu-doped TiO2 (Cu/TiO2) nanoparticle as antifungal phytophthora palmivora

Preparation of Cu-doped TiO2 nanoparticles (Cu/TiO2) as antifungal Phytophthorapalmivorahas been carried out. In this study, we did a synthesis of Cu/TiO2 nanoparticles by the sol-gel method and determine the performance of the modification of Cu/TiO2 nanoparticles as antifungal agents P. palmivora. The stages of this research include synthesis of Cu/TiO2 nanoparticles using the sol-gel method, characterization of Cu/TiO2 nanoparticles using UV-Vis DRS and characterization of Cu/TiO2 nanoparticles using SEM-EDX, and P. palmivora antifungal activity test. TiO2 is known to be used as an antifungal agent and to increase photocatalyticactivity, TiO2 is doped with Cu metal ions to be active in visible light. The results showed that Cu/TiO2 has a band gap energy of 3.12 eV. Based on the results of SEM-EDX analysis of TiO2-Cu nanoparticles confirmed the presence of elements Cu (2.16%), Ti (28.74%) and O (69.10%) with morphological shapes such as irregular spheres. Cu/TiO2 nanoparticles have a strong ability at concentrations of 0.05% and 2.5% in inhibiting the growth of the fungus P. palmivora. Percent inhibition respectively 60.41% and 75% and at concentrations>3% have activities that can kill P. palmivora fungus.

Aktivitas Anti Candida albicans ATCC 14053 Sediaan Pasta Gigi Gel Ekstrak Daun Jengkol (Archidendron pauciflorum) dengan Kombinasi Na-CMC dan Karbomer

Jengkol leaf extract can inhibit the growth of the fungus Candida albicans because it contains flavonoids, saponins, and tannins. Candida albicans species are most commonly found in the oral cavity that can cause various diseases in humans as canker sores and skin lesions. The purpose of this study was to formulate jengkol leaf extract into gel toothpaste preparations by distinguishing variations in the concentration of carbomer as a gelling agent. The research method used is experimental. Jengkol leaf samples extracted using the maceration method with 70% ethanol. The concentration of active substance used in each formula was 7.5% based on the preliminary test results and the carbomer concentration used was 0.5% in formula I, 1% in formula II, 1.5% in formula III, and 2% in formula IV. The physical stability test consists of organoleptic, homogeneity, spreadability, viscosity, pH, and high foam for 28 days of storage. Antifungal activity test using the disc diffusion method. Statistic analysis performed using the Shapiro-Wilk, Levene Statistics, and One Way Anova methods. During 28 days of keeping all formula homogeneous stable. The viscosity increased in each formulation due to differences in the concentration of carbomer used, the higher of carbomer the more viscous of the preparation, the pH, foam height of the formulation was stable and met the standard. The particles are evenly distributed so that the formulation colors and odors have stable. The result of the antifungal activity test of toothpaste gel extract of 7,5% jengkol leaf has inhibition of 11 mm. The increase in carbomer concentration showed a significant difference in each formula based on the One Way Anova statistical analysis (p <0.05) and the addition of carbomers to the formula showed stable viscosity and high foam. The most stable formula is the formula I with a carbomer concentration of 0.5%.

Characterization of PVDF/Graphene Nanocomposite Membranes for Water Desalination with Enhanced Antifungal Activity

Seawater desalination is a worldwide concern for the sustainable production of drinking water. In this regard, membrane distillation (MD) has shown the potential for effective brine treatment. However, the lack of appropriate MD membranes limits its industrial expansion since they experience fouling and wetting issues. Therefore, hydrophobic membranes are promising candidates to successfully deal with such phenomena that are typical for commercially available membranes. Here, several graphene/polyvinylidene (PVDF_G) membranes with different graphene loading (0–10 wt%) were prepared through a phase inversion method. After full characterization of the resulting membranes, the surface revealed that the well-dispersed graphene in the polymer matrix (0.33 and 0.5 wt% graphene loading) led to excellent water repellence together with a rough structure, and a large effective surface area. Importantly, antifungal activity tests of films indicated an increase in the inhibition percentage for PVDF_G membranes against the Curvularia sp. fungal strain. However, the antifungal surface properties were found to be the synergistic result of graphene toxicity and surface topography.

Posaconazole micelles for ocular delivery: in vitro permeation, ocular irritation and antifungal activity studies.

Posaconazole (PSC) is a triazole group anti-fungal agent with the widest spectrum. Although there is no commercially available ocular dosage form, its diluted oral suspension preparation (Noxafil®) is used as off-label in topical treatment of severe keratitis and sclerokeratitis in the clinic. However, ocular bioavailability of PSC suspension form is extremely low due to its highly lipophilic character. Thus, there is a clinical need to improve its ocular bioavailability and to develop novel delivery system for the treatment of ocular fungal infections. Herein, we studied ex vivo permeation, penetration, anti-fungal activity, and Hen's Egg Test-Chorioallantoic Membrane (HET-CAM) toxicity tests in order to assess ocular targeting of PSC micelles, which were optimized in our previous study. The results indicated that micellar carrier system increased the permeability of PSC to eye tissues. Micelles showed higher affinity to ocular tissues than that of commercial oral suspension of PSC (Noxafil®). In vitro anti-fungal activity data also confirmed the efficacy of PSC loaded micellar formulations against Candida. albicans strains. The relative safety of the optimized micelles on the ocular tissue was shown with the HET-CAM toxicity test. In conclusion, micellar systems could be a promising strategy for the effective and safe delivery of PSC in the treatment of ocular fungal infections.

Formulation and Antifungal Activity of Piper betle L. Leaf Extract in Emulsion Gels Against Candida albicans

Candidiasis is the most common fungal infection in humans and is a form of primary and secondary infections of C. albicans. Betel (Piper betle L.) leaf extract has been reported to exhibit efficacious antifungal effects against C. albicans. Emulsion gels, a type of topical dosage form, can deliver hydrophilic and hydrophobic drugs and perform multiple and controlled releases. This research aimed to determine the antifungal activity and physical properties of emulsion gels formulated from betel leaf extract. The dried betel leaves were extracted by maceration with alcohol 95%. Then, with different concentrations (1, 2, and 4%), the extract was formulated into emulsion gels. These dosage forms were later subjected to antifungal activity testing against C. albicans using the cup plate diffusion method that involved Mycoral Cream® for comparison. In this test, the intensity of the activity was determined by measuring the diameter of the formed inhibition zone. The second test evaluated the physical characteristics of the dosage forms, including organoleptic properties, pH, adhesion, dispersion, and viscosity. These data were analyzed using the Mann-Whitney method, and the conclusion was withdrawn from describing the results quantitatively. The reaction yield of the extraction was 9.702%. The analysis results showed that emulsion gels containing 1, 2, and 4% of betel leaf extract created zones of inhibition with diameters of 5.3 ± 0.29, 6.2 ± 0.29, and 10.2 ± 0.41 mm, respectively. As for the physical properties, they differed in pH (6.39 ± 0.120, 6.17 ± 0.132, 5.66 ± 0.123), spreadability (1.849 ± 0.45, 1.816 ± 0.051, 1.771 ± 0.092 g.cm.s-1), adhesion (110 ± 10.8, 126.3 ± 8.5, 142.7 ± 13.50 seconds), and viscosity (2640.35, 1992.95, 2162.12 cps), respectively. The betel leaf emulsion gels exhibited antifungal activity against C. albicans (p <0.05) and met the physical requirements of semi-solid dosage forms.

Isolation and potential biocontrol of the fungus causing anthracnose in longan in Vietnam

Introduction: Longan is a crop plant of very high economic value, and both its fruit and flower are beneficial for human health. Longan has been increasingly cultivated in Vietnam due to the increasing demand for domestic consumption as well as export of its fruit. However, the widespread emergence and spread of anthracnose, a group of fungal disease affecting a wide range of plant species, in longan has seriously affected both the longan fruit yield and quality in Vietnam. Current methods for the prevention of anthracnose in longan depend mainly on the use of fungicides which are very harmful to human health as well as disruptive to microbial community structures in different ecosystems. In order to obtain an environmentally friendly method of control for this disease, the agent causing anthracnose in longan must first be identified. Therefore, the aim of this study was to isolate and identify the causal anthracnose agent in longan in Vietnam.
 Methods: Experiments were first carried out with pieces of anthracnose longan leaves pressed onto the surface of potato-dextrose agar (PDA) and incubated for days at 30◦C. Colonies, varying in appearance, were repeatedly isolated and purified on PDA agar, and the anthracnose-causing agent was initially recognized on the basis of colony characteristics and cell morphology. The suspected isolate was then tested for its ability to decompose healthy longan leaf in vitro, and its rDNA region was cloned and sequenced to determine its taxonomy. Antifungal activity testing was performed using the co-culture method.
 Results: We obtained a fungal isolate with septate hyphae, ovoid appressoria, and conidia (which were cylindrical in shape with rounded ends). This isolate showed a clear ability to decompose healthy longan leaves. At the molecular level, the isolate was determined to be a fungal species belonging to genus Colletotrichum, and therefore named Colletotrichum sp. strain BKHCM. We also found that its growth was inhibited when co-cultured with Streptomyces flaveus, an actinomycete originating from soil.
 Conclusion: For the first time, we isolated a fungal species belonging to genus Colletotrichum from anthracnose-infected longan leaves in Vietnam. We also showed that the growth of this fungus could potentially be biocontrolled.

The Impact of Cultivation Media on the In Vitro Biofilm Biomass Production of Candida spp.

The yeasts of the genus Candida are among the most clinically significant fungal pathogenic agents. One of the unique features of the Candida species' pathogenicity is their ability to form biofilms. Generally, infections caused by biofilm-forming microorganisms tend to have chronic course and are difficult to treat. This fact highlights the need to search for drugs with anti-biofilm activities. At present, there are variety of protocols for performing antifungal anti-biofilm activity testing in which fundamental differences, especially in the choice of cultivation media for biofilm formation, can be noted. In our study, we focused on the effect of four different culture media on biofilm biomass formation in ten Candida spp. strains. With emphasis placed on clinical significance, strains of the C. albicans species were predominantly included in this study. Based on our results, we can conclude that the availability of other components in the culture media, such as amino acids or proteins, and not just the commonly mentioned glucose availability, helps promote the transition of Candida yeasts into a sessile form and leads to in vitro robust biofilm formation. We revealed that biofilm formation in C. albicans strains was enhanced, especially in media supplemented with fetal bovine serum (FBS). The nutritionally balanced cultivation medium with 10g/L glucose and 10% (v/v) FBS evidently showed the most significant benefit for in vitro biofilm production in C. albicans strains.

Phytoconstituents and Biological Activities of Zanthoxylum armatum Fruit Extract

The essential oil and methanol extract of the fruit of Zanthoxylum armatum DC were extracted by hydro-distillation in the Clevenger apparatus and cold percolation technique respectively and their chemical and biological studies were performed. The chemical compositions of essential oil were analyzed by GC-MS analysis. The most abundant ingredient was Linalool (75.31%) followed by E-methyl cinnamate (11.73%) and limonene (9.45%). The nature of the functional groups present in the extract was analyzed by performing FTIR analysis. The methanol extract showed the presence of alkaloids, flavonoids, glycosides, polyphenols, terpenoids, volatile oils, tannins, and saponins. Biological activities of the oil and extract were evaluated by performing brine shrimp bioassay, antibacterial activity test, and antifungal activity test. Essential oil (LC50 = 76.70 µg/mL) and methanol extract (LC50 = 62.25 µg/mL) were found highly cytotoxic against brine-shrimp nauplii. The essential oil showed potent antibacterial activity against gram-positive bacteria Bacillus subtilis, Micrococcus leutus, and Staphylococcus aureus with the zone of inhibitions 11 mm, 16 mm, and 17 mm respectively and moderate antibacterial activity against the gram-negative bacteria Klebsiella pneumonia, Enterobacter cloacae, and Pseudomonas aeruginosa with the zone of inhibitions 9 mm, 5 mm and 6 mm respectively. The methanol extract was found to be effective against gram-positive bacteria only. Both oil and extract showed moderate antifungal activity against bacterial strains.

Biogenic α-Fe2O3 Nanoparticles Enhance the Biological Activity of Trichoderma against the Plant Pathogen Sclerotinia sclerotiorum

The biogenic synthesis of metallic nanoparticles can contribute to resolving problems related to pests and soil fertilization. Among the different types of metallic nanoparticles, iron nanoparticles have shown good results, especially concerning toxicity because this metal is an essential micronutrient for all plants and can assist their growth, increasing the levels of carbohydrates, proteins, and chlorophyll. This work performed the green synthesis of biogenic iron oxide nanoparticles using the biological control agent Trichoderma harzianum as a stabilizing agent. The physicochemical properties of the nanoparticles were evaluated using the following techniques: dynamic light scattering, nanoparticle tracking analysis, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Cytotoxicity was evaluated using different cell lines, while comet and Allium cepa assays were used to assess genotoxicity. In addition, as a proof of concept, the biological activity of the nanoparticles against the pathogen Sclerotinia sclerotiorum (white mold) was evaluated using an in vitro antifungal activity test. The effect of the nanoparticles on seed germination was also evaluated. The results indicated that the nanoparticles consisted of hematite (α-Fe₂O₃) and had a mean size diameter of 207 ± 2 nm, polydispersity index of 0.45 ± 0.07, and zeta potential of 13 ± 2 mV. The biogenic iron oxide nanoparticles did not alter cell viability, compared to the controls, and did not lead to changes in the mitotic index, at the concentrations used. Furthermore, they were able to increase the proliferation of Trichoderma, which led to the inhibition of emergence of the pathogen S. sclerotiorum and did not affect the germination of the seeds. Therefore, the green synthesis of biogenic iron oxide nanoparticles based on T. harzianum is an attractive option for pest control, aiming at sustainable agricultural practices.

Characterization of chitinolytic bacteria isolated from shrimp and crab waste producing chitinase and anti-fungal enzymes to overcome saprolegniasis in aquaculture

Chitinolytic bacteria was proposed in this study as an effective solution to overcome the growth of Saprolegnia sp in aquaculture practices.Saprolegnia sp. causesSaprolegniosis, a disease that affects aquaculture species characterised by white filamentous mycelium on the body or fins of freshwater fish. The use of probiotic bacteria as an alternative strategy to traditional chemical remedies may be applied. Potential bacteria may be isolated from shrimp and crab waste since these organic materials were known to harbor these organisms. The search for the specific bacteria was conducted through the research activity namely isolation and cultivation of bacteria, chitinolytic activity test, anti-fungal activity test using Saprolegnia sp and finally characterization through molecular analysis of 16S rRNA gene and chitinase encoding fragments. Cultivation of isolated bacteria and general characterization used Gram staining while the results of the chitinolytic activity test showed that the selected candidates (species 1 dan 2) obtained the highest chitinolytic indexes of 2.12 mm and 1.99 mm, respectively. Results of the invitroanti-fungal activity test usingSaprolegnia sp using species 1 and 2 obtained the zone of inhibitionrespectively 6.00 mm and11.59 mm. Species 1 and 2 were identified with a similiarity of 96% to Bacillus thuringiensis (no accession YP 003665928.1) and 99% identical toBacillus cereus (without accession WP 000932552.1).

Synthesis, characterization and the antifungal activity test of some organotin(IV) benzoates

In continuing search on the biological activity of the organotin compounds we are working with, We here reported the synthesis and the antifungal activity test of three organotin(IV) complexes of dibutyltin(IV) dibenzoate (3), diphenyltin(IV) dibenzoate (6) and triphenyltin(IV) benzoate (9). These three compounds were prepared by the reaction of dibutyltin(IV) dichloride (1), diphenyltin(IV) dichloride (4), and triphenyltin(IV) chloride (7) via dibutyltin(IV) oxide (2), diphenyltin(IV) oxide (5), and triphenyltin(IV) hydroxide (8) with benzoic acid. The product obtained in each step was characterized by UV, IR and NMR spectroscopies and also microelemental analysis. The antifungal activity test was carried out against Fusarium oxysporum strain. The results showed that the inhibition zone shown by these organotin(IV) benzoate were found by far much more active compared to the free benzoic acid, the starting materials 1, 4, 7, and the intermediate products, 2, 5 and 8. The inhibition zone of each of the compounds tested was compared with the control where the fungus alone was grown in the media. The results showed that triphenyltin(IV) benzoate (9) was the most active compound against the fungus and the minimum inhibitory concentration obtained was about 0.7 mM.

Synthesis of TiO2-Ag composite through ultrasonic batch cleaning technique as a candidate for antifungal agent Phytophthora palmivora

In this work, TiO2-Ag composites have been synthesized through the Ultrasonic Batch Cleaning technique and applied as an antifungal candidate against Phytophthora palmivora. P. palmivora is a pod rot fungus on cacao plants. Physically, the successful synthesis of TiO2-Ag has been characterized by a change in the color of the precipitate from white to grey. This success was confirmed by Scanning Electron Microscopy (SEM) analysis, where the presence of Ag+ ions made the TiO2 surface more regular. The Ag+ ion was evenly distributed on the TiO2 surface and covers the large TiO2 particles. The results of EDX analysis have shown that the % composition of TiO2-Ag was 93.22%, each consisting of Ti of 50.37%, O of 37.57%, and Ag of 5.25%. Based on the antifungal activity test, TiO2-Ag has good antifungal activity against P. palmivora. The minimum inhibitory level occurred at a concentration of 2.50%, while the minimum lethal rate occurred at a concentration of 4.88%.

Analysis antifungal compounds produced by endophytic bacteria from oil plant using Bioautography

This study was undertaken to evaluate the antifungal activities of the bioactive compounds poduced by endophytic bacteria isolated from oil palm plant using TLC-Bioautography. Antifungal compounds used in this study have been extracted from potential endophytic bacteria of previous studies using ethyl acetate solvent. The antifungal compounds was tested for its activity against the pathogenic fungus Fusarium oxysporum f.sp. by using TLC-Bioautography method. The results showed that there are 3 spots on the TLC plate for samples of B11 antifungal compound with an incubation time of 54 hours and B11 with an incubation time of 24 hours. Observation of bioautographic antifungal activity test showed the presence of inhibition zones with the largest average percentage given by B11 with an incubation time of 24 hours is 11.59%. The inhibition zone provided B11 with an incubation time of 54 hours is only 11.08%.