Larvicidal, nematicidal, antifeedant and antifungal, antioxidant activities of Mentha spicata (Lamiaceae) root extracts

Purpose: To evaluate the larvicidal, nematicidal, antifeedant, and antifungal effects of 10 solvent extracts of Mentha spicata root.Methods: Ten solvent extracts were investigated for their total flavonoid and phenolic content and screened for larvicidal, nematicidal, antifeedant, and antifungal activities. The total phenolic content of the extracts was determined using the Folin–Ciocalteu method, while total flavonoid content was determined by aluminium chloride (AlCl3) colorimetric assay. Four solvents extracts were screened for antifungal activity against Aspergillus niger, Candida albicans, recultured Cryptococcus neoformans, and Microsporum audouinii using the agar diffusion method. The nematicidal activity of the compounds was evaluated against the juvenile Meloidogyne javanica organism, while larvicidal properties were evaluated against the urban mosquito Culex quinquefasciatus using a standard bioassay protocol. The antifeedant activity of marine acclimated Oreochromis mossambicus was used for evaluating ichthyotoxic potential.Results: The total flavonoid content in the extracts ranged from 18.5 to 83.4 mg/g, and the amount of free phenolic compounds ranged from 14.7 to 91.9 mg/g of extract powder. The water extract of these plants exhibited significant antioxidant activity and significant levels of phenolics and flavonoids. The water extract exhibited higher larvicidal (LD50 = 11.77 μg/mL), nematicidal (LD50 = 11.78 μg/mL), antifeedant (LD50 > 40 μg/mL), and antifungal activities (minimum inhibitory concentration: 16 μg/mL) against M. audouinii compared with the other extracts.Conclusion: These results show that the water extract of Mentha spicata may be used as a potential natural alternative source of nutritional and pharmaceutical ingredients.Keywords: Mentha spicata, Larvicidal, Nematicidal, Antifeedant and Antifungal activities, Nutritional supplement, Pharmaceutical ingredient

Corrigendum: Synthesis and cytotoxic activity of novel indole derivatives and their in silico screening on spike glycoprotein of sars-cov-2

The authors Kaliappillai Vijayakumar, Magda H. Abdellattif, Mohd Shahbaaz were not included in the published article and the authors Daoud Ali, Saud Alarifi, and Amal Alotaibi were mistakenly included in the author list. The author list has been corrected throughout the article and in the Author Contributions statement. In addition, the funding information was incorrect and has been amended to include funding for Magda H. Abdellattif. The corrected Author Contributions, Funding and Acknowledgments statements appears below. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated

Synthesis and antibacterial activity of pyrano[3,2-g]chromene-4,6-dione derivatives and their molecular docking and DFT calculation studies

Pyran-4-one and chromenone are well known bioactive compounds, particularly antimicrobial activity. Present study investigation antibacterial activity of pyranone connected chromenone derivatives. New synthesis of pyrano[3,2-g]chromene-4,6-dione derivatives were synthesized via catalysis free eco-friendly method. Synthesized compounds were characterized by FTIR, 1H NMR, 13C NMR, and mass spectral analysis. An entirely new synthesis of pyrano[3,2-g]chromene-4,6-dione derivatives (1a–o) were studied for their in vitro antibacterial properties. The gram-positive bacterium B. cereus was thought to be the most sensitive of the studied microorganisms, and compounds 1f, 1 g, 1 k, 1 l, and 1o demonstrated the best antibacterial action. The results of the antibacterial activities would suggest that 1 g was more effective against B. cereus (MIC: 0.5 μg/mL) than other compounds and Ciprofloxacin (MIC: 2 μg/mL). Against B. cereus bacterial pathogens, compound 1 g demonstrated exceptional antibacterial activity. The compound 1 g and Ciprofloxacin docked with 5V8E protein action of compound 1 g (-7.2 kcal/mol) and ciprofloxacin (-3.2 kcal/mol) is quite potent, and it also showed greater binding affinity. DFT calculation was well support the performance of energy gap between low and highly active compounds for 1 k (ΔE gap = 0.15 eV) and 1 g (ΔE gap = 0.16 eV), respectively. The lead molecules were used for antibacterial agent

Antimicrobial and cytotoxic activities of novel pyrimidine-2,4-dione connected with 2H-thiopyran derivatives

Objectives: The purpose of this study is to develop a new pyrimidine-2,4-dione hybrid with 2H-thiopyran molecules as a potential antibacterial and antifungal agents against clinical pathogens that cause infectious diseases, in addition to conducting the cytotoxic screening. Methods: The synthesis of 2H-thiopyran connecting pyrimidine-2,4-dionederivatives was carried out in a medium consisting of water with an Mg(II) acetate catalyst. The antimicrobial activity of all synthesized compounds was tested against Gram-positive (Staphylococcus aureus (ATCC-25923), Enterococcus faecalis (clinical isolate), and Gram-negative (Klebsiella pneumoniae (clinical isolate), Escherichia coli (ATCC-2522), and Pseudomonas aeruginosa) bacteria. Antifungal activity was examined in vitro using Aspergillus niger, Candida albicans, Microsporum audouinii, and Cryptococcus neoformans as test organisms (clinical isolates). Cytotoxic assay was also performed in vitro at various concentrations. Results: The highly active compound in this study was 3-((2,6-di(furan-2-yl)dihydro-2H-thiopyran-4(3H)-ylidene)amino)dihydropyrimidine-2,4(1H,3H)-dione which exhibited the lowest MIC value (8 µg/mL) with broad activity against one Gram-positive and three Gram-negative. The compound, 3-((2,6-di(furan-2-yl)dihydro-2H-thiopyran-4(3H)-ylidene)amino)dihydropyrimidine-2,4(1H,3H)-dione showed least MIC value (MIC: 0.25 µg/mL) against C. albicans. The compound 3-((2,6-bis(4-hydroxyphenyl)dihydro-2H-thiopyran-4(3H)-ylidene)amino)dihydro pyrimidine-2,4(1H,3H)-dione was highly active (GI50 0.03 µm) against HeLa cancer cell lines. Conclusions: The overall results indicated that a successful preparation of a few of the promising molecules, which are antimicrobials well as cytotoxicity has been achieved

Grindstone Chemistry: Design, One-Pot Synthesis, and Promising Anticancer Activity of Spiro[acridine-9,2′-indoline]-1,3,8-trione Derivatives against the MCF-7 Cancer Cell Line

In this study, the synthesis of one-pot 10-phenyl-3,4,6,7-tetrahydro-1H-spiro [acridine-9,2′-indoline]-1,3,8-trione derivatives was achieved via a four-component cyclocondensation reaction, which was carried out in solvent-free conditions, and using p-toluenesulfonic acid (p-TSA) as a catalyst. The product was confirmed by FT-IR, 1H-NMR, 13C-NMR, mass spectra, and elemental analysis. Furthermore, the anticancer activity was screened for all compounds. Among these compounds, compound 1c was more effective (GI50 0.01 µm) against MCF-7 cancer cell lines than standard and other compounds. Therefore, the objective of this study was achieved with a few promising molecules having been demonstrated to be potential anticancer agents

Correction: Gobinath, P., et al. Grindstone Chemistry: Design, One-Pot Synthesis, and Promising Anticancer Activity of Spiro[acridine-9,2′-indoline]-1,3,8-trione Derivatives against the MCF-7 Cancer Cell Line. Molecules 2020, 25, 5862

In the original article [...

Synthesis of anthraquinone-connected coumarin derivatives via grindstone method and their evaluation of antibacterial, antioxidant, tyrosinase inhibitory activities with molecular docking, and DFT calculation studies

Anthraquinones and coumarins have excellent pharmacological activities and are an important class of natural plant metabolites with various biological activities. In this study, anthraquinone-9,10-dione and coumarin derivatives were combined to develop a novel anthraquinone-connected coumarin-derivative sequence. The synthesised novel anthraquinone-connected coumarin derivatives (1a-t) were screened for in vitro antibacterial, antioxidant, and tyrosinase inhibitory activities. The antibacterial activities of the synthesised compounds (1a–t) were tested against both gram-positive and gram-negative bacteria. Specifically, compound 1t was more active against E. aerogenes than ciprofloxacin. With regard to antioxidant activity, compound 1o (50.68 % at 100 μg/mL) was highly active compared to the other compounds, whereas it was less active than the standard BHT (76.74 % at 100 μg/mL). In terms of compound 1r (9.31 ± 0.45 μg/mL) was highly active against tyrosinase inhibitory activity compared with kojic acid (10.42 ± 0.98 μg/mL). In the molecular docking study, compound 1r had a higher docking score (−8.8 kcal mol−1) than kojic acid (−1.7 kcal mol−1). DFT calculations were performed to determine the energy gap of highly active compound 1r (ΔE = 0.11) and weakly active compound 1a (ΔE = 0.12). In this study, we found that every molecule displayed significant antibacterial, antioxidant, and tyrosinase inhibitory properties. Based on these reports, compounds 1r and 1t may act as multi-target agents

Synthesis and Characterization of Aminophosphonate Containing Chitosan Polymer Derivatives: Investigations of Cytotoxic Activity and in Silico Study of SARS-CoV-19

Chitosan is broadly used as a biological material since of its excellent biological activities. This work describes investigations of chitosan interaction with SARS-CoV-2, which is occupied by human respiratory epithelial cells through communication with the human angiotension-converting enzyme II (ACE2). The β-chitosan derivatives are synthesized and characterized by FT-IR, nuclear magnetic resonance (1H and 13C NMR), mass spectrometry, X-ray diffraction, TGA, DSC, and elemental analysis. The β-chitosan derivatives were screened for cytotoxic activity against the HepG2 and MCF-7 (breast) cancer cell lines. Compound 1h (GI50 0.02 µM) is moderately active against the HepG2 cancer cell line, and Compound 1c is highly active (GI50 0.01 µM) against the MCF-7 cancer cell line. In addition, chitosan derivatives (1a–1j) docking against the SARS coronavirus are found by in-silico docking analysis. The findings show that compound 1c exhibits notable inhibition ability compared with other compounds, with a binding energy value of −7.9 kcal/mol. Based on the molecular docking results, the chitosan analog is proposed to be an alternative antiviral agent for SARS-CoV2

Synthesis and Cytotoxic Activity of Novel Indole Derivatives and Their in silico Screening on Spike Glycoprotein of SARS-CoV-2

This work investigated the interaction of indole with SARS-CoV-2. Indole is widely used as a medical material owing to its astounding biological activities. Indole and its derivatives belong to a significant category of heterocyclic compounds that have been used as a crucial component for several syntheses of medicine. A straightforward one-pot three-component synthesis of indole, coupled with Mannich base derivatives 1a–1j, was synthesized without a catalyst. The products were confirmed by IR, 1H-NMR, 13C-NMR, mass spectra, and elemental analysis. The indole derivatives were tested for cytotoxic activity, using three cancer cell lines and normal cell lines of Human embryonic kidney cell (HEK293), liver cell (LO2), and lung cell (MRC5) by MTT assay using doxorubicin as the standard drug. The result of cytotoxicity indole compound 1c (HepG2, LC50−0.9 μm, MCF−7, LC50−0.55 μm, HeLa, LC50−0.50 μm) was found to have high activity compared with other compounds used for the same purpose. The synthesized derivatives have revealed their safety by exhibiting significantly less cytotoxicity against the normal cell line (HEK-293), (LO2), and (MRC5) with IC50 > 100 μg/ml. Besides, we report an in silico study with spike glycoprotein (SARS-CoV-2-S). The selective molecules of compound 1c exhibited the highest docking score −2.808 (kcal/mol) compared to other compounds. This research work was successful in synthesizing a few compounds with potential as anticancer agents. Furthermore, we have tried to emphasize the anticipated role of indole scaffolds in designing and discovering the much-awaited anti-SARS CoV-2 therapy by exploring the research articles depicting indole moieties as targeting SARS CoV-2 coronavirus

Larvicidal Activity of Geranylacetone Derivatives against Culex quinquefasciatus Larvae and Investigation of Environmental Toxicity and Non-Target Aquatic Species

A grindstone method based on Mannich condensation was used to synthesize geranylacetone derivatives (1a–1f). The method showed a high yield under milder reaction conditions. Analyses of the synthesized compounds were carried out by FTIR, 1H, 13C NMR, mass spectrometry, and elemental analysis. We synthesized and evaluated the larvicidal and ichthyotoxic activities of six compounds (1a–1f) in this study. Compound 1f (5,9-dimethyl-1-phenyl-3-(2-(3-phenylallylidene)hydrazinyl)deca-4,8-dien-1-one) was more active (LD50: 14.1 µg/mL) against the second instar larvae of Culex quinquefasciatus than geranylacetone (67.2 µg/mL), whereas the former caused 13.9% mortality at 100 µg/mL. Geranylacetone, in an antifeedant screening test, showed 53.1% against Oreochromis mossambicus within 24 h. The compound 1f showed high larvicidal activity against C. quinquefasciatus and was non-toxic to non-target aquatic species