Open AccessLSPR-based cholesterol biosensor using a tapered optical fiber structure
Author(s) -
Santosh Kumar,
Brajesh Kumar Kaushik,
Ragini Singh,
NanKuang Chen,
Qing Shan Yang,
Xia Zhang,
Wenjun Wang,
Bingyuan Zhang
Publication year - 2019
Publication title -
biomedical optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.10.002150
Subject(s) - surface plasmon resonance , biosensor , materials science , colloidal gold , cholesterol oxidase , scanning electron microscope , optical fiber , fiber optic sensor , detection limit , transmission electron microscopy , optics , nanotechnology , optoelectronics , nanoparticle , fiber , cholesterol , chemistry , medicine , chromatography , physics , composite material
Accurate cholesterol level measurement plays an important role in the diagnosis of severe diseases such as cardiovascular diseases, hypertension, anemia, myxedemia, hyperthyroidism, coronary artery illness. Traditionally, electrochemical sensors have been employed to detect the cholesterol level. However, these sensors have limitations in terms of sensitivity and selectivity. In this paper, a localized surface plasmon resonance (LSPR) -based biosensor is demonstrated that accurately detects and measures the concentration of cholesterol. In the present study, a tapered optical fiber-based sensor probe is developed using gold nanoparticles (AuNPs) and cholesterol oxidase (ChOx) to increase the sensitivity and selectivity of the sensor. Synthesized AuNPs were characterized by UV-visible spectrophotometer, transmission electron microscope (TEM), and energy dispersive X-ray spectroscopy (EDS). Further, coating of AuNPs over fiber was confirmed by scanning electron microscope (SEM). The developed sensor demonstrates for a clinically important cholesterol range of 0 to 10 mM, and the limit of detection is found to be 53.1 nM.