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Updated: Apr 11, 2026

A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering

A Rapid and Chemical-free Hemoglobin Assay with Photothermal Angular Light Scattering

Published on: December 7, 2016

Photothermal Recycling Biosensing for Continuous, Sensitive Molecular Quantification.

Yongchen Tai¹, Yunshen Li¹, Wenting Wang¹

¹Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, Florida, USA.

Biorxiv : the Preprint Server for Biology

|April 10, 2026

Summary

This summary is machine-generated.

Researchers developed photothermal recycling (PTR), a novel sensing method for continuous biochemical monitoring. This technique enables rapid, highly sensitive measurements in complex biological fluids, advancing diagnostic capabilities.

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Area of Science:

Biomedical Engineering
Analytical Chemistry
Biosensing Technology

Background:

Continuous biochemical sensing offers critical physiological and pathophysiological insights.
Existing bioanalytical methods struggle with rapid, sensitive, and specific measurements in complex biological fluids.
Reconciling slow kinetics for sensitivity with fast kinetics for rapid measurements is a key challenge.

Purpose of the Study:

To introduce a novel sensing mechanism for overcoming limitations in continuous biochemical sensing.
To enable rapid and sensitive molecular detection in complex biological fluids for frequent measurements.
To develop a new bioanalytical paradigm for diverse applications.

Main Methods:

Introduced photothermal recycling (PTR), a sensing mechanism inspired by polymerase chain reaction thermal cycling.
Utilized plasmonic photothermal effects to rapidly recycle molecular binders.
Developed a digital PTR assay for biochemical monitoring.

Main Results:

Achieved multi-hour biochemical monitoring with subpicomolar (pM) sensitivity.
Demonstrated assay performance in buffer, diluted serum, and saliva.
Leveraged localized thermal energy to dynamically modulate biomolecular recognition.

Conclusions:

Photothermal recycling (PTR) offers a new bioanalytical paradigm for continuous biochemical sensing.
The digital PTR assay enables sensitive and frequent measurements in complex biological samples.
This approach has broad applicability across various settings requiring real-time biochemical monitoring.