Glucose is one of the most important substances widely contained in organism and food, thus people pay much attention
in researching and improving the way for the detection of glucose. Traditional ways, although precise and reliable when
in high concentration and large amount of sample, have unconvincing performance in detecting mixture and solution
with low concentration and micro-volume. As far as the ideal way is concerned, it should not only specifically detect the
glucose and exclude other components in solution, but also meet the need of micro-sample (approximately 5μL) and low
concentration. We introduced D-galactose/D-glucose Binding Protein (GGBP) - a kind of protein which has the ability
to absorb the glucose specifically, to construct a novel surface plasmon resonance measuring system. By immobilizing
GGBP onto the surface of the SPR sensor, we develop a new detecting system for glucose testing in mixed solution. The
experimental result indicates that compared with 0.1g/L before immobilization of GGBP, the detecting limit or the
resolution of glucose testing rises to 1mg/L after the immobilization, the system succeeds in distinguishing glucose from
other components in mixture, which reveals a bright future to apply SPR in the minimally invasive diabetes testing and
food quality control.
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