Boronic
Acid Functionalized Aza-Bodipy (azaBDPBA)
based Fluorescence Optodes for the Analysis of Glucose in Whole Blood
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Abstract
A near-infrared
fluorescent dye (aza-bodipy or azaBDPBA) functionalized
with boronic acid groups was synthesized for the preparation of optodes
to measure glucose in 40-fold diluted whole blood. Boronic acid groups
as an electron deficient group on aza-bodipy was reacted with hydrogen
peroxide into an electron-rich phenolic group leading to the red-shift
of emission wavelength from 682 to 724 nm. The emission in near-infrared
region offered a low level of background interference from whole blood.
Also, the dual-wavelength emission guaranteed our probe to measure
glucose in whole blood accurately after the conversion of glucose
into hydrogen peroxide using glucose oxidase. The measuring range
of glucose from 0.2 to 200 mM in the buffer was achieved with high
selectivity. To facilitate the blood test, the probe was immobilized
into thin hydrophobic polymer films to prepare the disposal glucose
optode, which could detect glucose in the solution from 60 μM
to 100 mM. The concentration of glucose in 40-fold diluted whole blood
was determined using our optode and the reference method, respectively.
The consistence in the concentration obtained from these two assays
revealed that our azaBDPBA-based optodes were promising for the clinic
assay of glucose in the whole blood