Table 2.

A comparison between sensors immobilized with and without single-walled carbon nanotubes.

Amperometric Test	Pt/SWNT/(CS/GNp/GOx)3	Pt/(CS/GNp/GOx)3
Detection range (glucose in PBS)	0–20 mg/dL	0–20 mg/dL
a Repeatability	<10%	<20%
b Limit of detection (LOD)	0.41 mg/dL	4.94 mg/dL
c linearity	0.98	0.78

^a Repeatability was presented by the coefficient of variation produced from at least four single-use sensors; ^b LOD was calculated by dividing the sum of an average blank signal (x) plus three times the standard deviation of x by the slope of regression line; ^c The linearity was evaluated by the R-squared (R²), which was a statistical measure of how close the data were to the fitted regression line. SWNT, single-walled carbon nanotubes; PBS, phosphate buffered saline; Pt, platinum; CS, chitosan; GNp, gold nanoparticles; GOx, glucose oxidase.