Fluorescent Probing Techniques for Hemoglobin Detection

Fluorescent probing techniques have emerged as powerful tools for the sensitive and selective detection of haemoglobin and related haemoproteins in clinical, pharmaceutical and environmental contexts. These approaches exploit the unique photophysical interactions between fluorophores—ranging from small‐molecule dyes to carbon‐based nanomaterials—and the haem moiety, yielding measurable changes in emission intensity, wavelength or lifetime. Core mechanisms include fluorescence resonance energy transfer (FRET), inner filter effects and static or dynamic quenching, often tailored to minimise interference from complex biological matrices. Advances in carbon dot synthesis, quantum dot engineering and dual‐channel sensing strategies have driven down detection limits into the nanomolar range, while integration with portable instrumentation and point‐of‐care platforms has enhanced real‐world applicability. Ongoing challenges relate to photostability, batch‐to‐batch reproducibility and the refinement of ratiometric readouts to improve quantitative reliability.

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Research from all publishers

Innovations in dual‐channel sensing have harnessed central carbon nanoclusters with excitation‐independent green emission and two distinct excitation centres. By exploiting differential overlap between haem absorption and each excitation band, researchers achieved simultaneous fluorescence readouts and quantitative hemin detection across submicromolar ranges, improving analytical fidelity. Parallel work has yielded a portable platform built around room‐temperature phosphorescent carbon dots, where inner filter quenching in the presence of hydrogen peroxide enables on‐site haemoglobin assays. The device integrates an LED excite source and photodiode detector within a reconfigurable electronic system, delivering detection limits near 6 nM. Foundational studies have also demonstrated the valorisation of industrial effluents—specifically cork‐industry wastewater—for carbon dot synthesis, achieving static quenching‐based haemoglobin detection at nanomolar sensitivity and elucidating quenching mechanisms through combined steady‐state and time‐resolved spectroscopy.

Fluorescent Probing Techniques for Hemoglobin Detection publication trend

The graph below shows the total number of articles in fluorescent probing techniques for hemoglobin detection across all publications each year (not limited to Nature Index journals).

Technical terms

Inner filter effect: Attenuation of excitation or emission light by an absorbing species, reducing apparent fluorescence.

Fluorescence quenching: Decrease in fluorophore emission caused by interaction with a quencher via energy or electron transfer.

Carbon dots: Nanoscale carbon-based fluorescent materials with tunable surface functionalities and high photostability.

Ratiometric sensing: Analytical method comparing fluorescence intensities at two wavelengths to correct for environmental fluctuations.

Phosphorescence: Emission from a triplet excited state, characterised by longer lifetimes than fluorescence.

References

1. Finding Value in Wastewaters from the Cork Industry: Carbon Dots Synthesis and Fluorescence for Hemeprotein Detection. Molecules (2020).
2. Portable Instrument for Hemoglobin Determination Using Room-Temperature Phosphorescent Carbon Dots. Nanomaterials (2020).
3. Dual-Exciting Central Carbon Nanoclusters for the Dual-Channel Detection of Hemin. Inorganics (2023).