We report here about the development of a fiber optic biosensor for the detection of vitamin D. The sensing platform is based on a long period grating (LPG) inscribed into a specialty double cladding fiber, whose sensitivity is enhanced through the mode transition phenomenon by chemical etching of the fiber outer cladding. The LPG is further covered with a nanosized layer of graphene oxide, providing carboxylic functional groups for the covalent immobilization of a vitamin D specific antibody. The testing was conducted using the major circulating form of vitamin D3, i.e., 25-OH-D3 (molecular weight ~400 Da), for which concentrations within 10-1000 ng/mL in buffer solution were measured. A limit of detection of medical interest lower than 10 ng/mL was attained.

Fiber optic biosensor based on long period grating for the detection of vitamin D

Esposito F.;Srivastava A.;Campopiano S.;Iadicicco A.
2021-01-01

Abstract

We report here about the development of a fiber optic biosensor for the detection of vitamin D. The sensing platform is based on a long period grating (LPG) inscribed into a specialty double cladding fiber, whose sensitivity is enhanced through the mode transition phenomenon by chemical etching of the fiber outer cladding. The LPG is further covered with a nanosized layer of graphene oxide, providing carboxylic functional groups for the covalent immobilization of a vitamin D specific antibody. The testing was conducted using the major circulating form of vitamin D3, i.e., 25-OH-D3 (molecular weight ~400 Da), for which concentrations within 10-1000 ng/mL in buffer solution were measured. A limit of detection of medical interest lower than 10 ng/mL was attained.
2021
978-1-7281-9501-8
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11367/101354
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