Widest Zone Of Inhibition Research Articles

Plumieride as a novel anti-fungal and anti-inflammatory iridoid against superficial candidiasis in mice

In the past few decades, there has been a notable rise in the occurrence of several types of candidiasis. Candida albicans is the most common cause of superficial fungal infections in humans. In this study, plumieride, one of the major iridoids from Plumeria obtusa L. leaves, was isolated and investigated for its potential against Candida albicans (CA)-induced dermatitis in mice. qRT-PCR was done to assess the impact of plumieride on the expression of the major virulence genes of CA. Five groups (n = 7) of adult male BALB/c mice were categorized into: group I: non-infected mice; group II: mice infected intradermally with 107–108 CFU/mL of CA; group III: CA-infected mice treated with standard fluconazole (50 mg/kg bwt.); group IV and V: CA-infected mice treated with plumieride (25- and 50 mg/kg. bwt., respectively). All the treatments were subcutaneously injected once a day for 3 days. Skin samples were collected on the 4th day post-inoculation to perform pathological, microbial, and molecular studies. The results of the in vitro study proved that plumieride has better antifungal activity than fluconazole, manifested by a wider zone of inhibition and a lower MIC. Plumieride also downregulated the expression of CA virulence genes (ALS1, Plb1, and Hyr1). CA-infected mice showed extensive dermatitis, confirmed by strong iNOS, TNF-α, IL-1β, and NF-κB genes or immune expressions. Whereas the treatment of CA-infected mice with plumieride significantly reduced the microscopic skin lesions and modulated the expression of all measured proinflammatory cytokines and inflammatory markers in a dose-dependent manner. Plumieride interfered with the expression of C. albicans virulence factors and modulated the inflammatory response in the skin of mice infected with CA.

Antibacterial Activity of the Allium sativum Crude Extract against Methicillin-resistant Staphylococcus aureus

Garlic contains various components, such as allicin, ajoenes, and allyl sulfides, which are organosulfur compounds. It exhibits antimicrobial activities in all forms, including garlic powder, garlic extract, and garlic oil. Additionally, it exerts anti-inflammatory, antibacterial, antibiofilm, and antifungal effects. The drastic increase in drug-resistant organisms worldwide, especially methicillin-resistant Staphylococcus aureus (MRSA) strains, has led to treatment failure in various infectious diseases. To overcome this issue, we aimed to assess the antibacterial activity of garlic extract against MRSA and explore its action mechanism against penicillin-binding proteins (PBPs) in this study. Mueller–Hinton agar was used for the agar well diffusion test. Moreover, bactericidal activity was determined using the Mueller–Hinton agar and spot tests. Molecular docking was performed using AUTODOCK to evaluate the PBP-binding ability of allicin. A wide zone of inhibition was observed for MRSA, and molecular docking revealed a strong interaction between PBP3 of S. aureus and allicin. Overall, our findings revealed the antibacterial activity of garlic extract against MRSA, a prevalent gram-positive coccus causing healthcare-associated infections. In addition to its affordability, the beneficial effects of garlic suggest its therapeutic potential for MRSA treatment in combination with cefoxitin.

Prospects of isolating new antimicrobial compounds from plants: The case of Azadirachta indica bark extract

Objectives: Essential oils and extracts from medicinal plants have been shown to have antimicrobial properties in several investigations carried out in regions with diverse floras. This study intends to evaluate the antimicrobial activity of Azadirachta indica (Neem plant) bark extract on microbial isolates. Materials and Methods: The plant’s bark was cut out of the tree, dried, and pulverized using a mechanical grinder. The crushed barks were split in half, one half macerated in ethanol and the other put through the Soxhlet apparatus. The ethanol extract of plant bark was used to analyze microbial isolates (Pseudomonas aeruginosa, Bacillus subtilis, Escherichia coli, Staphylococcus aureus, and Candida albicans). The active components in the extracts were analyzed using gas chromatography-mass spectrometry. Results: According to the inhibition zone width, mean inhibition concentration, and lowest bactericidal concentration, all organisms were shown to be sensitive to the antibacterial activities of A. indica at varied doses of the extracts utilized. For every isolate examined, the minimum inhibitory concentration (MIC) of the extract was 12.5 mg/mL; however, B. subtilis had a concentration of 25 mg/mL. The extract had bactericidal activity on all the isolates except Bacillus sp. The minimum bactericidal concentration (MBC) for the isolates was 12.5 mg/mL for P. aeruginosa, S. aureus, and C. albicans, and 100 mg/mL for E. coli. Among the principal compounds discovered are pentadecanoic acid, 14-methyl-methyl ester, stigmasterol, 9-octadecanoic acid (z)-methyl ester, methyl stearate, n-hexadecanoic acid, linoelaidic acid, and Vitamin E. Conclusion: Our research showed that the ethanol extract from A. indica bark contains several bioactive compounds with antimicrobial properties.

DEVELOPMENT OF THE PHARMACEUTIC CRYSTALLIZATION PROCESS USING PLASMODIUM FALCIPARUM, A DERIVATIVE OF THIOSEMICARBAZONE

Objective: The current study was designed with the goal of analyzing novel derivatives of organic and semi-organic NLO molecules that are just entering this field as the foundation for future therapeutic development. Methods: Thiosemicarbazones (TSC) are semicarbazide analogs that have sulfur atoms in place of oxygen atoms. The greatest number of therapeutic treatments for various disorders are also being used carbonyl compounds. These two types of organic compounds were combined, and their replacement with crystal growth procedures using solution growth was tested as an antibiotic for a few fastidious and nonfastidious species. The preparation of meta-substituted benzaldehydes using TSC. Tests were conducted with this single component. The following experimental technique was used to determine the antibacterial activity of Plasmodium falciparum. Half-inhibitory maximum (IC50) by calculation technique, cell viability % calculation method, and MTT assay by colorimetric method. Results: Method using agar discs. Using the agar disc diffusion method to measure the inhibition zone width and comparing the minimal inhibitory concentration (MIC) and inhibition zone width of available antibiotics against the aforementioned organism using data from the EUCAST and NCCLS databases, The absolute, relative, and mound slope values of an antibiotic that is currently on the market may be determined using the GraphPad Prism software; the epidemiological cutoff value can be determined using the ECOF Finder software; and the nature of the antibiotic can be determined using the WHONET 5.6 software. The newly developed antibiotics’ size and structure are contrasted with the structures of commercially available antibiotics and living organisms. Conclusion: The design of new drugs using novel derivatives of organic and semiorganic NLO molecules is based on the in vitro method of analysis, which has recently been introduced to this field. P. falciparum has an extremely low MIC value (0.625 μg/mL) against TSCMNB. The MIC break points are always larger than, not equal to, the MIC values and fall within the range of 110 μg/mL–130 μg/mL. We concluded that all of the novel compounds exhibit a susceptible form of inhibition.

Investigation of Polyurethane Primer Coating Paint Based on Local Palm Oil with Antimicrobial and Anticorrotion Agent Formula Bentonite-Chitosan

Paint is a product that is really needed to coat iron or steel materials such as industrial pipes, medical equipment, and so on. The sample formulation used was the addition of chitosan bentonite filler 2, 4, 6, 8% w/w. In TGA testing, the sample underwent single decomposition and showed the best results in the Polyurethane/Bentonite/Chitosan 8:8% w/w sample where the sample began to degrade at a temperature of 416.85 (℃). The bacterial test results showed the best results in the Polyurethane/Bentonite/Chitosan 8:8% w/w sample which had the widest inhibition zone with a value of 6.9 mm for E.Coli bacteria. The sample with the composition Polyurethane/Bentonite/Chitosan 8:8% w/w was the best sample where the sample experienced the smallest corrosion rate, namely 5.08 mpy. The application of this paint is to strengthen the durability of the building so that corrosion does not occur in the Hagu Barat Laut of Lhokseumawe because it is close to sea waters which have air levels that are quite susceptible to corrosion.

Uji aktivitas antimikroba ekstrak daun tumbuhan akar kucing (Acalypha indica L.) terhadap mikroba patogen manusia

The leaves of Acalypha indica L. were used as the object that are easily found around the home contain secondary metabolites as antimicrobials for Meticillin Resistant Staphylococcus aureus (MRSA) and Candida albicans. The method used for plant sampling is purposive sampling method. Extraction of active compounds using maceration method. The antimicrobial potency test used the agar-diffusion method using two types of microbial pathogens: Meticillin Resistant Staphylococcus aureus (MRSA) and C. albicans. Each paper disk was given 50 L of bacterial isolate and incubated at 370C for 24 hours and continued for 48 hours. The parameter observed is the clear zone formed around the paper disk. The results showed that the leaves of contained compounds that could inhibit the growth of MRSA bacteria and the fungus. A good solvent to extract the active compounds contained in the leaves of is distilled water. The extract - distilled water treatment with a concentration of 100% had the widest inhibition zone among other treatments, which was 4.5 mm against the growth of the fungus

Perbandingan ekstraksi akar kucing (Acalypha indica l.) dengan ekstrak etanol 96% dan ekstrak akuades terhadap pertumbuhan EPEC dan Candida albicans

The root of the cat (Acalypha indica L.) was used as the object of research and extraction was carried out to determine the antimicrobial activity of 96% ethanol extract and distilled water against EPEC (Enterophatogenic Escherichia coli) bacteria and the fungus Candida albicans. The method used for plant sampling is purposive sampling method. Extraction of active compounds using maceration method. The antimicrobial potency test used the agar-diffusion method using two types of microbial pathogens, namely the bacteria EPEC and the fungus Candida albicans. Each paper disk was given 50 µL of bacterial isolate, incubated at 37 0C for 24 hours and continued for 48 hours. The observed parameter is the clear zone formed around the paper disk. The results showed that cat root (A. indica L.) contains compounds that can inhibit the growth of EPEC bacteria and the fungus C. albicans. A good solvent to extract the active compounds contained in the cat root plant (A. indica L.) is distilled water. Treatment with aquadest extract with a concentration of 100% had the widest inhibition zone among other treatments, namely 6.8 mm against the growth of EPEC bacteria and ethanol extract with a concentration of 100% which was 3.8 mm against the growth of the fungus Candida albicans.

Evaluation of antifungal activity of vanilla pods silver nanoparticles against various oral candidal species: An in-vitro study.

The oral health of individuals is undoubtedly affected by the fact that fungal microorganisms are currently resistant to the conventional antifungal drugs used. Still, there are numerous emerging therapeutic alternatives available like phytotherapy. The phytochemistry of various plant species has indicated that phytochemicals could be a better source of medicine with outstanding antifungal, healing, anti-inflammatory spectrum, and antioxidant properties. To evaluate the antifungal efficacy of silver nanoparticles of vanilla pods against Candida albicans, Candida glabrata, and Candida krusei and to compare with Fluconazole. The vanilla pods were procured from the organic store. The aqueous extracts were prepared. Ten percent of the vanilla extract was utilized to generate the silver nanoparticles. The generated silver nanoparticles were characterized visually based on color change and confirmed by UV spectroscopy. Disk diffusion method was used to determine the antifungal activity of the vanilla pods reinforced silver nanoparticles at different concentrations (20 μl, 40 μ, 40n μ, and 80 μand 80ratioC. albicans, C. glabrata, and C. krusei. The antifungal efficacy of the produced nanoparticles was evaluated against a standard of ketoconazole (30 μ30. Vanillin silver nanoparticles exhibit commendable antifungal activity against C. albicans, C. glabrata which is equivalent to that of ketoconazole, and amplified activity against drug-resistant C. krusei was evident. Silver nanoparticles from vanilla pods were studied and their wider zones of inhibition indicated exemplary antifungal efficacy compared with conventional antifungal drugs like ketoconazole. Future research on vanillin nanocarrier systems might enhance their stability, bioavailability, and bioactivity. As an outcome, with some promising advances in this area, it would be captivating to pursue a systematic investigation into the potential effects of vanillin at the cellular and molecular levels. This will enable us to further assess its applicability as an active biopharmaceutical ingredient in mouthwashes, probiotic lozenges, and denture resin for use as an effective strategy against the biofilm growth of various Candida species.

Efekti antibakteror i Thymus serpyllum ndaj E. faecalis në dentinën radikulare

Despite the advanced use of preparation techniques, in- struments, application of irrigants, namely simultaneous root canal medications, endodontic failures can occur. Therefore, in order to find a new alternative, we have de- termined that the purpose of this in vitro research is: to evaluate the antibacterial efficiency of the extract of Thy- mus serpyllum alone and in combination with NaOCl 2%, as well as Chlorhexidine against Enterococcus faecalis in the solution with dentin powder using the agar disk diffusion method. The zones of inhibition caused by the herbal ex- tract of Thymus serpyllum were evaluated after 5 minutes, 60 minutes and 24 hours, and were compared with the standard solutions of NaOCl 2 % and Chlorhexidine after mixing with the dentin powder. The statistical analysis of the results was done with One Way ANOVA and the Kruskal Wallis test. Sodium hypochlorite 2% has shown antibacte- rial effect against Enterococcus faecalis by forming a wide zone of inhibition, but after mixing with dentin powder, its effect is reduced. Chlorhexidine 2% has shown an antibac- terial effect against E.faecalis, giving an inhibition zone, which is reduced under the influence of dentin powder. Chlorhexidine after mixing with plant extracts of Thymus serpyllum has resulted in more powerful antibacterial effect against E.faecalis. The herbal extract of Thymus serpyllum has been shown to be effective against E.faecalis, which is re- duced under the influence of dentin powder.

Conjugated microporous polymers as a novel generation of drug carriers: A systemic study toward efficient carriers of tetracycline antibiotic

Herein, a novel approach for synthesizing three distinct types of conjugated microporous polymers (CMPs) is presented. The method involves utilizing 2,1,3-benzothiadiazole (BBT) as a common monomeric unit, along with other monomeric units such as triphenylamine (TPA), tetraphenylethylene (TPE), and pyrene (Py), which exhibit varying levels of planarity. The synthesis of CMPs is achieved through a Suzuki coupling condensation reaction involving 4,7-dibromo-2,1,3-benzothiadiazole (BBT-Br2) and 1,4-benzeneboronic acid [PhB(OH)2]. The resulting CMPs possess unique structural characteristics, adjustable pore sizes, and exceptional chemical and physical properties, thereby surpassing other existing materials in their performance. Notably, these CMPs demonstrate favorable thermal stability and porosity comparable to previously reported CMPs in the literature. Among the synthesized CMPs, the TPE-Ph-BBT CMP exhibits the highest thermal stability, with a char yield of 72 wt%. Additionally, the biocompatibility and toxicity of the CMPs are assessed using an MTT assay and a live/dead cell viability assay. The findings reveal that the CMPs exhibit low toxicity and outstanding biocompatibility, as evidenced by cell viability values exceeding 90% after 24 or 48 h of incubation. Thus, these CMPs hold significant potential for biomedical applications. Furthermore, the CMPs can effectively serve as drug carriers for tetracycline antibiotics. The antimicrobial activity of tetracycline (TCH)-loaded CMPs is evaluated using an inhibition zone methodology, demonstrating wide zones of inhibition measuring up to 1.7 cm against Staphylococcus aureus (S. aureus) and 1.9 cm against Escherichia coli (E. coli). This study highlights the promising prospects of CMPs in molecular engineering and their utility in diverse therapeutic applications as efficient drug carriers.

ANTIMICROBIAL ACTIVITY OF ORGANIC NLO CRYSTALS USING THIOSEMICARBAZONE DERIVATIVE

Thiosemiccarbozones are having enormous medicine applications due to the presence of hetero atom nitrogen and sulfur in its molecular structure. The carbonyl compounds are also having the largest clinical applications to cure many diseases. We merged these two classes of organic compounds and their substitution by solution growth techniques of crystal growth tested as antibiotic against few fastidious and non fastidious gram +ve and gram –ve organisms. Ortho substituted para substituted and Meta substituted benzaldehydes were merged with thiosemicarbazone and prepared. Thiosemicarbazone of (2-chlorophenyl) methylideneamino thiourea, when compared with linear optical material, these NLO have high medicinal application since it is the photo dynamic therapeutically more active, proved by the early researches mentioned in the experimental part. These one compounds were tested against. Streptococcus Aureus, the following experimental method was adopted find out the antimicrobial activity. MTT assay by colorimetric method, Cell viability percentage calculation method, Half inhibitory maximum (IC50) by calculation method. Agar disc diffusion method. Inhibition zone width by agar disc diffusion method, EUCAST and NCCLS database analysis to compare the MIC and inhibition zone width of existing antibiotic against the above said one organism, Graphpad prism software is used to find out the absolute, relative IC50 value and hill slope value, ECOF finder software to find out the epidemiology cutoff value, WHONET 5.6 software analysis is used to find out resistant, susceptible or intermediate nature of commercially existing antibiotics. Size and structure of the newly designed antibiotics compare with the structure of commercially existing antibiotics and structure of organisms. KEYWORDS: MTT Assay, Cell Viability, IC 50, Agar Dis Diffusion, Graph pad ,EcoF Finder, EUCAST,NCCLS.

Manfaat Ekstrak Kunyit (Curcuma domestica Val.) Dalam Menghambat Pertumbuhan Staphylococcus aureus

Background: Staphylococcus aureus is an major human pathogen. Most individuals get Staphylococcus aureus infections with varying degrees of malignancy, such as superficial pyoderma, at some point in their lives. Antibiotics are often used to treat Staphylococcus aureus infections, however they may not be utilised or prescribed correctly, resulting in resistance. Alkaloids, flavonoids, tannins, essential oils, terpenoids, and curcuminoids are some of the active components in turmeric that have antibacterial properties. Objective: The goal of this study was to see how efficient the most effective turmeric extract (Curcuma domestica Val.) was in stopping Staphylococcus aureus from growing. Methods: This is an experimental research with a post-test control group. A maceration process employing 96 percent ethanol as a solvent was used to extract Singaraja turmeric. The extract concentrations employed in this research were 15%, 30%, 50%, 75%, and 100%; the positive control was vancomycin, and the negative control was 96 percent ethanol. Using the disc spreading approach, the test was conducted four times. The Kruskal-Wallis test was used to examine the findings of the research. Results: For the average, the inhibition zones were 7 mm, 7.25 mm, 7.5 mm, 7 mm, and 7 mm in diameter at each concentration. This research obtained significance figure by 0.001 (p<0.05). This suggests that the development of Staphylococcus aureus is influenced by varying amounts of turmeric ethanol extract. Conclusions: Turmeric extract (Curcuma domestica Val.) inhibits the growth of Staphylococcus aureus at all concentrations, with 50% of the extracts displaying the largest inhibition zone width.

Effect of Crude and Volatile Oil Extract of Casuarina cunninghamiana Leaves on Candida albicans

This research involved extracting the crude and volatile oil from Casuarina cunninghamiana leaves, which are part of the Casuarinaceae family. It also involved doing a phytochemical screen to determine the yield of the crude and volatile oil extract., The antifungal effects of crude and volatile oil extract depended on concentration; for example, a methanol crude extract of leaves expressed its maximal inhibitory zone at 400 mg/ml, which was 20.12 mm, but at low concentrations of 100 mg/ml, it was 13.2 mm. While the inhibitory zone against C. albicans at a high concentration of ethanol crude extract of leaf reached a diameter of 1 9.12 mm. In contrast, the inhibition zone width against C. albicans in the high concentration of hexan volatile oil extract reached 22.15 mm despite the low concentration of reported 12.3 mm. The low concentration of 13.12 mm was however measured. In hexan volatile oil extract, C. albicans exhibited great activity. The width of the inhibitory zone, however, is against C. albicans obtained a diameter of 21.13 mm at a low concentration of 14.12 mm of ether volatile oil extract. The study’s objective is to determine the best extract (crude or volatile oil extract), as well as the best alcoholic extract (methanol, ethanol, ether, and hexan), and the best concentration of the study extracts.

Anti-Stapylococcus Epidermidis of Methanolic Extracts from Some East Lombok Medicinal Plants

Wounds are structural and functional disruptions of the skin that occur as a result of an injury. Wound healing is a complex tissue repair or remodelling process in response to the injury. The most common factor that causes wounds not properly heal is infection. An infection develops when microorganisms enter the body, multiply, and trigger an immune reaction in the body. This study aims to determine the activity of Jatropha multifida L., Stachytarpheta jamaicensis (L.) Vahl, Centella asiatica (L.) Urb., Euphorbia pulcherrima Willd. ex Klotzsch, and Angelica keiskei (miq.) Koidz has long been used to treat and manage wounds in East Lombok. The plants were dried and macerated with methanol; excessed solvent was evaporated. Disc diffusions were used to determine the antibacterial activity of the plant extracts. All extracts were tested against Staphylococcus epidermidis, a common cause of wound infection. Statistically, the activity of Jatropha multifida (5;10 mg/mL), Stachytarpheta jamaicensis (10 mg/mL), Centella asiatica (10 mg/mL), Euphorbia pulcherrima (M) (5, 10 mg/mL), and Angelica keiskei (2,5; 5; 10 mg/mL) extracts were comparable with positive control. However, Angelica keiskei has a wider inhibition zone than other extracts. This discovery could be served as a basis for using plants to aid wound healing, especially to combat the interference bacteria. However, further research is needed to discover the active phytochemicals involved in the antibacterial and wound healing process.

Biodecolourization of Textile Effluents using Ligninolytic Enzymes Produced from Selected Bacterial and Fungal Isolated From Soil Contaminated Textile Waste

ABSTRACT Textile effluent contains enormous chemicals with detrimental environmental effects on both fauna and flora due to its chemical compositions. In this study, the effect of lignolytic enzymes produced by microorganisms for the treatment of textile effluent was examined using standard microbiological techniques. The potential of the isolates to produce laccase (L), lignin peroxidases (LiP) and manganase peroxidase (MnP) was investigated using streak plate method and assay methods. Finally, the L, LiP and MnP enzymes produced with the optimal processing parameter were used to decolorize textile effluent singly and in combination for ten (10) days. Fourteen (14) microbial isolates which include eight (8) bacterial and four (4) fungi were isolated from soil contaminated with textile effluents. Aspergillus terreus and Aspergillus niger showed higher production of laccase with 8.0 mm diameter zone of inhibition. Bacillus licheniformis and Bacillus subtilis had the widest zone of inhibition (12.0 and 8.0 mm) respectively. Only Aspergillus flavus however had the potential to produce lignin peroxidase (with 10 mm zones of clearance) of all the fungi isolated in this study. Laccase caused the highest decolourization of 72.5% comparable to 71.1% observed for the three enzyme combination while LiP has 57.0%. This finding established the potential use of bacterial ligninocellulolytic enzymes for the decolourization of textile effluent.

The antagonistic potential of peanut endophytic bacteria against Sclerotium rolfsii causing stem rot

Peanut stem rot caused by Sclerotium rolfsii Sacc. is the most common disease of peanut worldwide and has become increasingly serious in recent years. This study is aimed at obtaining peanut endophytic bacteria with high antagonistic/protective effects against peanut stem rot. In total, 45 bacterial strains were isolated from healthy peanut plants from a severely impacted area. Of these, 6 exhibited antagonistic activity against S. rolfsii, including F-1 and R-11 with the most robust activity with an inhibition zone width of 20.25 and 15.49 mm, respectively. These two were identified as Bacillus sp. and Burkholderia sp., respectively, based on morphological, physiological, and biochemical characteristics and 16S rDNA sequencing. To the best of our knowledge, this is the first study to report the Burkholderia sp. antagonistic effect on S. rolfsii as a biological control agent for peanut stem rot. Their culture filtrates potently inhibited the hyphal growth, sclerotial formation, and germination of S. rolfsii. Also, the strain-produced volatile compounds inhibited the fungal growth. Pot experiments showed that F-1 and R-11 significantly reduced the peanut stem rot disease with the efficacy of 77.13 and 64.78%, respectively, which was significantly higher compared with carbendazim medicament (35.22%; P < 0.05). Meanwhile, F-1 and R-11 improved the activity of plant defense enzymes such as phenylalaninase (PAL), polyphenol oxidase (PPO), and peroxidase (POD) enhancing the systemic resistance of the peanut plants. This study demonstrated that Bacillus sp. F-1 and Burkholderia sp. R-11, with a strong antagonistic effect on S. rolfsii, can be potential biocontrol agents for peanut stem rot.

Evaluations of Antibacterial Properties of Zingiber purpureum Essential Oil Against 13 Different Gram-positive and Gram-negative Bacteria

BACKGROUND: Indonesia's tropical forest is home to around 80% of the world's medicinal plants. One of these is Zingiber purpureum, which have traditionally been used to treat joint discomfort, the common cold, and jaundice. The rhizomes of this plant have been suggested to possess antibacterial action in the treatment of infections. In this study, Z. purpureum was screened for antibacterial activity against 13 bacteria (Gram-positive and Gram-negative).METHODS: Z. purpureum rhizomes were obtained and the distillated extracts were made to generate essential oil. The minimum inhibitory concentration (MIC) and Kirby Bauer disk diffusion methods were used to determine the antibacterial activity.RESULTS: All bacteria activity were inhibited by the essential oil of Z. purpureum at concentrations ranging from 2.5 vol% to 10 vol%. However, several bacterias (Escherichia coli, Pseudomonas aeruginosa, and Enterobacter cloacae) were inhibited at the lowest concentration (0.63 vol %), with the inhibition zones ranging from 6.7 mm to 8.0 mm. Meanwhile, the widest inhibition zone (13.3 mm) was reported on E. cloacae at 10 vol% concentration.CONCLUSION: A 10 vol% Z. purpureum rhizome extract inhibits Gram-positive and Gram-negative bacteria, particularly those that are resistant to a variety of antibiotics.KEYWORDS: Zingiber purpureum, antibacterial agents, susceptibility test, infection

In vitro antimicrobial appraisal of the potentials of Morinda lucida against some selected bacteria

The bioactive compounds from plant extract represent a potent alternative to combating the increasing antimicrobial resistance (AMR) to synthetic drugs. This study aimed to investigate the phytochemical, and antibacterial activities of Morinda lucida. Leaves of M. lucida was extracted successively using n-hexane, acetone, methanol and distilled water. The crude plant extracts were evaluated for their antibacterial activity against pathogens found in food and other sources such as Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Salmonella enterica serovar Typhi, Escherichia coli, and Klebsiella spp. using the agar well diffusion technique. Minimum inhibitory concentration (MIC) was carried out using the microbroth dilution technique. The phytochemical analysis showed the presence of alkaloids and sterols in all extracts. Flavonoid was only present in the n-Hexane extract. The result showed that n-Hexane extract had the widest zone of inhibition against P. aeruginosa - 13.67 mm (12.5 mg/mL MIC), B. subtilis - 15 mm (12.5 mg/mL MIC), while acetone extract was most active against S. enterica ser. Typhi - 24.67 mm (6.25 mg/mL MIC), S. aureus - 24.83 mm (3.13 mg/mL MIC), E. coli - 13.33 mm (1.56 mg/mL MIC) and Klebsiella spp. - 18.33 mm (12.5 mg/mL MIC). These findings indicated that n-Hexane and acetone extract of M. lucida exhibited significant antimicrobial activity. Therefore, further research should be carried out to isolate the bioactive compounds with potentials in developing new drug leads against drug-resistant microbial strains.

Preparation and application of silver/chitosan-sepiolite materials with antimicrobial activities and low cytotoxicity

Antimicrobial materials can prevent microbial infection and affect the beauty and structure of interior walls. Herein, a hybrid material silver/chitosan-sepiolite (Ag/5CTs-Sep) with antimicrobial activities was prepared via impregnation. Its antimicrobial properties were investigated via the disk diffusion method. Results showed that the width of inhibition zone of Ag/5CTs-Sep against Staphylococcus aureus (S. aureus), Escherichia coli (E. coli) and Aspergillus niger reached 58.15, 32.95 and 35.18 mm, respectively. The Sep was a suitable carrier for increasing thermal stability and antimicrobial durability, and chitosan improved the dispersion of silver to enhance antimicrobial activities. In addition, characterization indicated that the modification of Sep by CTs can promote the formation of lattice oxygen in Ag/5CTs-Sep, which can induce a high reactive oxygen species (ROS) content, causing the death of microbials. The antifungal mechanism revealed that the death of Aspergillus niger was due to Ag/5CTs-Sep that induced the production of high ROS level and damaged cell membrane. Moreover, Ag/5CTs-Sep possessed low cytotoxicity, and an applied test of the water-based coatings showed that the addition of Ag/5CTs-Sep could both effectively inhibit microorganisms and meet the performance standards for water-based coatings. This work may provide new guidance for the design and application of antibacterial materials.

α-Glucosidase Inhibitory and Antimicrobial Benzoylphloroglucinols from Garcinia schomburgakiana Fruits: In Vitro and In Silico Studies.

α-Glucosidase plays a role in hydrolyzing complex carbohydrates into glucose, which is easily absorbed, causing postprandial hyperglycemia. Inhibition of α-glucosidase is therefore an ideal approach to preventing this condition. A novel polyprenylated benzoylphloroglucinol, which we named schomburgkianone I (1), was isolated from the fruit of Garcinia schomburgkiana, along with an already-reported compound, guttiferone K (2). The structures of the two compounds were determined using NMR and HRESIMS analysis, and comparisons were made with previous studies. Compounds 1 and 2 exhibited potent α-glucosidase inhibition (IC50s of 21.2 and 34.8 µM, respectively), outperforming the acarbose positive control. Compound 1 produced wide zones of inhibition against Staphylococcus aureus and Enterococcus faecium (of 21 and 20 mm, respectively), compared with the 19 and 20 mm zones of compound 2, at a concentration of 50 µg/mL. The MIC value of compound 1 against S. aureus was 13.32 µM. An in silico molecular docking model suggested that both compounds are potent inhibitors of enzyme α-glucosidase and are therefore leading candidates as therapies for diabetes mellitus.