Spectroscopic Interactions with Serum Albumin

Serum albumin is the most abundant circulatory protein, renowned for its capacity to bind a wide variety of endogenous and exogenous ligands. Spectroscopic techniques have become indispensable for elucidating the nature of these interactions, offering insights into binding sites, affinity, conformational changes and functional implications. Intrinsic fluorescence spectroscopy exploits the native emission of tryptophan and tyrosine residues to monitor ligand association and protein folding, while circular dichroism reveals secondary and tertiary structural perturbations. Advances in aggregation-induced emission (AIE) probes and Förster resonance energy transfer (FRET) approaches have further extended the sensitivity and specificity of detection, enabling point-of-care diagnostics and real-time monitoring of albumin in complex biological matrices. Complementary methods such as Fourier transform infrared spectroscopy, ultraviolet–visible absorption and time-resolved fluorescence have enriched our understanding of binding thermodynamics and kinetics. Together, these approaches inform drug design, diagnostic assay development and the mechanistic basis of albumin’s antioxidative and transport functions.

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Spectroscopic Interactions with Serum Albumin publication trend

The graph below shows the total number of articles in spectroscopic interactions with serum albumin across all publications each year (not limited to Nature Index journals).

Technical terms

Aggregation-induced emission (AIE): A photophysical phenomenon in which certain fluorophores become highly emissive upon aggregation, used to amplify detection signals in biological assays.

Förster resonance energy transfer (FRET): A distance-dependent energy transfer mechanism between a donor and an acceptor fluorophore, employed to estimate spatial proximity within biomolecular complexes.

Circular dichroism (CD) spectroscopy: A chiroptical technique that measures differential absorption of left- and right-handed circularly polarised light, providing information on protein secondary and tertiary structure.

Intrinsic fluorescence spectroscopy: The monitoring of endogenous tryptophan and tyrosine fluorescence to assess protein conformational changes and ligand binding.

Near-infrared fluorescence: Fluorescence emission in the 650–900 nm range, advantageous for reducing biological autofluorescence and enabling deeper tissue penetration.

References

1. Microalbuminuria sensitive near‐infrared AIE probe for point‐of‐care evaluating kidney diseases. Aggregate (2024).
2. Modulating protein unfolding and refolding via the synergistic association of an anionic and a nonionic surfactant. Journal of Colloid and Interface Science (2024).
3. Bovine and Human Serum Albumin Interactions with 3-Carboxyphenoxathiin Studied by Fluorescence and Circular Dichroism Spectroscopy. Molecules (2010).