@article {1317, title = {Evaluating Bioactive Potential of Lichen Secondary Metabolites for the Formulation of Mosquito Repellent}, journal = {Pharmacognosy Research}, volume = {16}, year = {2024}, month = {October 2024}, pages = {908-916}, type = {Original Article}, chapter = {908}, abstract = {

Background: Mosquitoes belong to the major disease transmitters causing millions of deaths every year. The cost of commercially available pyrethroids, environmental regulations and toxicity of commercial repellents force researchers to develop potential repellents of natural origin. Lichens comprise of bioactive compounds exhibiting multifarious biomedical potential. Objectives: In this present study, Parmotrema species was analyzed for its biomedical potential including antioxidant, anti-inflammatory and repellent activity. Materials and Methods: Antioxidant activity was evaluated by DPPH, FRAP assay. Anti-inflammatory activity was assessed by albumin denaturation and protease inhibition assay. The repellent potential evaluated against third and fourth-instar larvae of Aedes ageypti. Conclusion: Antioxidant activity by DPPH assay and FRAP assay exhibited IC50 of 16.08 μg/mL and 24.6 μg/mL respectively. Anti-inflammatory potential via inhibition of albumin denaturation and protease inhibition assay shown maximum inhibition at 100 μg/mL with IC50 value of 17.02 μg/mL and 27.5 μg/mL respectively. The repellent test confirmed that at 100 μg/mL, 90\% of mortality rate was recorded. The repellent cream formulated form lichen extract exhibited 86.6\% protection and smoke toxicity test demonstrated 26.6\% protection against Aedes ageypti. Thus, the study evidenced the proven biomedical potential of methanolic lichen extract.

}, keywords = {Larvicidal activity, Lichen, Mosquito, Mosquito repellent activity, Secondary metabolites}, doi = {10.5530/pres.16.4.103}, author = {Shanmugam Poornima and Vivekanandhan Vidhya Sree and Jaganathan Geethanjali and Rajamanickam Karishma and Moorthy Viksha and Balasubramani Suresh Gopi and Ganesan Kishore} } @article {186, title = {Larvicidal Efficacy of Andrographis paniculata and Tinospora cordifolia against Aedes aegypti: A Dengue Vector}, journal = {Pharmacognosy Research}, volume = {12}, year = {2020}, month = {January 2021}, pages = {352-360}, type = {Original Article}, chapter = {352}, abstract = {

Background: Aedes aegypti, dengue fever mosquito, is predominantly accompanying the transmission of dengue in tropical and subtropical countries of the world, causing millions of deaths every year. Materials and Methods: The current research was carried out to evaluate the larvicidal efficiency of Andrographis paniculata and Tinospora cordifolia against third instar larvae of A. aegypti using in silico and experimental study. Results: The methanolic extract of A. paniculata and ethanolic extract of T. cordifolia showed the highest larvicidal activity with LC50 and LC90 value of 15.75 ppm; 349.60 and 100.64 ppm; 386.37 ppm, respectively after 48 h exposure, which was statistically significant (P = 0.05). However, the combined action of methanolic extract of A. paniculata + ethanolic (50:50) extract of T. cordifolia and the bioactive fraction of methanolic extract of A. paniculata showed the effective larvicidal activity with LC50 value of 113.20 ppm and 236.08 ppm respectively after 24 h treatment which was statistically significant (P = 0.05). The m/z values in liquid chromatography-mass spectrometry graph of bioactive fraction of methanolic extract of A. paniculata predicted the possible amount of bioactive compound class like flavone, phenols, phenylpropanoids, flavonoids, phenolic acid, alkaloids, isopalmitic acid, diterpenoids and quinic acid. The best energy binding affinity score against sterol carrying protein-2 of A. aegypti, panicolin (-9.86 kcal/mol), berberine (-10.13 kcal/mol) and their combination (50:50) showed effective larvicidal movement with LC50 value of 25.41 ppm, 23.15 ppm and 17.56 ppm after 24 h treatment. Conclusion: The crude extracts, bioactive fractions and synthetic bioactive compounds and their combination study of A. paniculata and T. cordifolia can be utilized as bio-control agents against A. aegypti mosquito.

}, keywords = {Aedes aegypti mosquito larvae, Andrographis paniculata, Chromatographic techniques, In silico study, Larvicidal activity, Phytochemical screening, Tinospora cordifolia}, doi = {10.4103/pr.pr_35_20}, author = {Anubrata Paul and V Samuel Raj and Arpana Vibhuti and Ramendra Pati Pandey} }