Bioactivity Analysis Using Thin-Layer Chromatography

Bioactivity analysis using thin-layer chromatography (TLC) has become an indispensable technique for the rapid screening and characterisation of biologically active compounds. Building on classical planar chromatography, modern approaches employ high-performance thin-layer chromatography (HPTLC) to achieve enhanced separation efficiency, reproducibility and throughput. Samples are applied as discrete bands or spots onto a sorbent-coated plate (often silica gel), then developed in an optimised solvent system. Once separated, zones can be subjected directly to on-plate bioassays—commonly termed TLC-direct bioautography or effect-directed analysis—by overlaying microbial suspensions, enzyme reagents or radical probes. Positive responses manifest as inhibition zones, colour changes or fluorescence quenching, allowing visual localisation of active constituents. Multi-imaging detection under ultraviolet, visible and fluorescence light further expands the dimensionality of activity profiling. Critical advances in hyphenation techniques now permit direct elution of bioactive zones into mass spectrometry or HPLC–MS workflows, streamlining structural elucidation and quantification. This versatile platform finds wide application in natural product discovery, quality control of herbal medicines and functional foods, detection of environmental contaminants and early-stage drug screening. Recent innovations in automation and open-source hardware have bolstered standardisation and throughput, reinforcing the global relevance of TLC-based bioactivity analysis.

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Bioactivity Analysis Using Thin-Layer Chromatography publication trend

The graph below shows the total number of articles in bioactivity analysis using thin-layer chromatography across all publications each year (not limited to Nature Index journals).

Technical terms

Thin-layer chromatography: A planar chromatographic technique in which compounds are separated on a thin sorbent layer under capillary action of a mobile phase.

High-performance thin-layer chromatography (HPTLC): An advanced form of TLC employing finer sorbent particles and precise sample application for higher resolution and reproducibility.

Bioautography: A method that couples chromatographic separation with on-plate biological assays to detect antimicrobial or enzymatic activity directly on the sorbent layer.

Effect-directed analysis: The integration of multiple on-surface bioassays (e.g. antioxidant, enzyme inhibition) on a chromatogram to profile diverse bioactivities in parallel.

Hyphenation: The coupling of TLC/HPTLC with downstream analytical techniques (e.g. HPLC, mass spectrometry) for structural characterisation of separated compounds.

Multi-imaging detection: Simultaneous visualisation of chromatograms under different light modes (UV, visible, fluorescence) to detect various classes of compounds and activities.

Stationary phase / Mobile phase: The solid sorbent layer (stationary) and the solvent or solvent mixture (mobile) that migrates through the layer, effecting separation of analytes.

References

1. Phytochemical and Bioactivity Studies on Hedera helix L. (Ivy) Flower Pollen and Ivy Bee Pollen. Antioxidants (2023).
2. Effect-Directed Profiling of Powdered Tea Extracts for Catechins, Theaflavins, Flavonols and Caffeine. Antioxidants (2021).
3. High-Performance Thin-Layer Chromatography Hyphenated with Microchemical and Biochemical Derivatizations in Bioactivity Profiling of Marine Species. Marine Drugs (2019).
4. Open‐source add‐on kit for automation of zone elution in planar chromatography. Rapid Communications in Mass Spectrometry (2020).