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Updated: Dec 26, 2025
Label-free Single Molecule Detection Using Microtoroid Optical Resonators
Published on: December 29, 2015
Flow-injection resonance light scattering detection of proteins at the nanogram level
Kejun Tan1, Yuanfang Li, Chengzhi Huang
1College of Chemistry and Chemical Engineering, and Key Laboratory of Eco-Environments of Three Gorges Reservoir Region under the Ministry of Education of PRC, Southwest Normal University, Chongqing 400715, People's Republic of China.
Abstract:
A resonance light scattering (RLS) detection method for protein was developed, using a flow-injection system based on the enhancement of RLS signals from Biebrich scarlet (BS) by protein. The enhanced RLS intensities at 286.0 nm, in acidic aqueous medium, were proportional to the protein concentration over the range 0.005-18 microg/mL and 0.008-16 microg/mL for human serum albumin (HSA) and bovine serum albumin (BSA), respectively, with corresponding limits of detection (3sigma) of 5.00 ng/mL for HSA, and 7.80 ng/mL for BSA. The method was successfully applied to the quantification of total proteins in human serum samples.
