A facile, one-pot three-component protocol for the synthesis of 2-amino-4H-chromene derivatives has been demonstrated using Bael Fruit Extract (BFE) as a natural catalyst in a green reaction medium.
Background: Green synthesis of nanoparticles has been emerging as interesting and expanding research area due to environmentally friendly, non-toxic, clean, less costly route and also it can be done at room pressure and temperature. Blumea lacera is described as a valuable medicinal plant in many vital systems of medicines. The study explored the eco-friendly green synthesis of MnO2 NPs using Blumea lacera leaf extract.
Method: Reduction of potassium permanganate (KMnO4) using Blumea lacera leaf extract were carried out at room temperature. The crude extract of Blumea lacera were added to metal ion reagents of specific volume and specific concentration at ambient temperature and stirred continuously using magnetic stirrer. The aqueous leaf extract reduced and stabilized the KMnO4 into MnO2 NPs. The MnO2 NPs obtained from the solution was purified and separated by repeated centrifugation using Remi cooling centrifuge model C-24.
Results: The biosynthesized MnO2 NPs characterized by UV–Vis spectroscopy showed an absorption peak at 400 nm. The XRD studies revealed the spherical shape of MnO2 NPs with an average particle diameter of 20 nm. FT-IR analysis confirmed the presence of functional groups -OH, C=O, C=C, and C-H triggering the synthesis of MnO2 NPs. Vibrational mode at around 606.62 and 438.81 cm−1 supports the occurrence of O–Mn–O bond.
Conclusion: The synthesized MnO2 NPs was found to be a good antibacterial and antifungal agent against bacterial stain Staphylococcus aureus, S. bacillus, Pseudomonas aeruginosa, E. coli and fungal stain C. albicans, Aspergillus niger and Sclerotium rolfsii.
Background and Objective: Plants are perceived as a safe and trusted means of mosquito bite prevention. Many plant extracts and oils repel mosquitoes, with their effect lasting from several minutes to several hours. The present investigation is aimed to evaluate the mosquito repellent activity of Calendula officinalis (Marigold leaves), Citrus madurensis (Calamondin leaves), Carica papaya (Papaya leaves), Origanum vulgare (Oregano leaves), in combination with natural binders.
Materials and Methods: In present work we have produced an effective and purely natural mosquito repellent cakes using marigold leaves, calamondin leaves, papaya leaves, oregano leaves, and to determine if the component present on them are suitable as mosquito repellent. To recognize this new combination and in addition use of natural binder in making these mosquito cakes is innovation of method. Evaluation was carried out in a net cage (45 cm×30 cm×25 cm) containing 100 blood starved mosquitoes.
Results: Study provides an herbal repellent with long lasting protection, safe for human life, and human with no side effect. The combination Paste of leaves + charcoal + 20% cow dung was found to be more repellency against mosquitoes under study.
Conclusion: Discovery of natural products, with potent phyto-constituents that have insecticidal properties, may help overcome problems of chemical insecticide resistance. Nature is the best combinatorial chemist to offer numerous natural products compounds from medicinal plants which can be effective as medicines, antibacterial, antifungal, insect repellent, cosmetics etc.
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