Biological Evaluation of Medicinal Plant Extracts
Summary
Biological evaluation of medicinal plant extracts encompasses a suite of in vitro and in vivo assays aimed at characterising the pharmacological potential, toxicity profile and mechanistic actions of bioactive secondary metabolites. This multidisciplinary field integrates phytochemical analysis, bioassays against microbial, fungal and cancer cell lines, and exploratory animal models to ascertain safety and efficacy. Core methodologies include antimicrobial susceptibility testing, antioxidant and anti-inflammatory assays, cytotoxicity screens and brine shrimp lethality assays as preliminary toxicity indicators. Advances in chromatographic fingerprinting and mass spectrometry enable rapid identification of alkaloids, flavonoids, terpenoids and phenolic compounds, while omics-driven metabolomics reveals biosynthetic pathways. The global significance of these evaluations lies in discovering novel therapeutics to combat antimicrobial resistance and chronic diseases, validating traditional uses and ensuring standardisation for herbal medicines. Collaborative efforts between ethnobotany, analytical chemistry and molecular pharmacology underpin the translation of promising extracts into clinical leads and nutraceutical formulations.
Research from Nature Portfolio
Recent studies have introduced a microfluidic high-throughput platform permitting simultaneous screening of hundreds of crude plant extracts against multidrug-resistant bacterial strains, thereby accelerating hit identification with minimal sample consumption. Complementary work has applied integrated metabolomic and transcriptomic profiling to non-model medicinal species, elucidating biosynthetic gene clusters responsible for potent anti-inflammatory terpenoids. In parallel, a novel three-dimensional cell-culture assay has been developed to assess the cytotoxicity of flavonoid-rich fractions on tumour organoids, offering a more predictive evaluation of anticancer potential compared with conventional monolayer assays.
Biological Evaluation of Medicinal Plant Extracts publication trend
The graph below shows the total number of articles in biological evaluation of medicinal plant extracts across all publications each year (not limited to Nature Index journals).
Technical terms
Minimum inhibitory concentration (MIC): The lowest concentration of an extract that prevents visible microbial growth.
Minimum bactericidal concentration (MBC): The lowest concentration of an extract required to kill a microbial population.
LC₅₀ (Median lethal concentration): The concentration of a substance causing death in 50% of a test population, often in brine shrimp assays.
High-performance thin-layer chromatography (HPTLC): A chromatographic technique for rapid separation and identification of phytochemicals.
Brine shrimp lethality assay: A bioassay using Artemia nauplii to assess general cytotoxicity of extracts.
Metabolomics: The comprehensive analysis of small-molecule metabolites in a biological sample.
In silico docking: Computational modelling to predict the binding affinity of compounds to target proteins.
References
- Antioxidant, Cytotoxicity, Antimicrobial Activity, and In Silico Analysis of the Methanolic Leaf and Flower Extracts of Clitoria ternatea. Biochemistry Research International (2023).
- HPTLC Fingerprints of Various Secondary Metabolites in the Traditional Medicinal Herb Hypochaeris radicata L.. Journal of Botany (2016).
- Brine shrimp lethality assay. Bangladesh Journal of Pharmacology (2017).
- Biological activity of Cucurbita maxima and Momordica charantia seed extracts against the biofilm-associated protein of Staphylococcus aureus: An in vitro and in silico studies. Informatics in Medicine Unlocked (2022).
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