iSense (United States)

A colorimetric sensor array has been developed for the rapid and sensitive detection of 20 toxic industrial chemicals (TICs) at their PELs (permissible exposure limits). The color changes in an array of chemically responsive nanoporous pigments provide facile identification of the TICs with an error rate below 0.7%.

This letter is in response to the study by Jungheim et al. (1) in the September issue of Diabetes Care . They studied a subcutaneous glucose monitoring system in 23 subjects with diabetes over a 3-day period. They report a satisfactory mean absolute difference (MAD) between sensor values and capillary blood glucose of 14.8%. I agree with the authors that their sensor, which uses microdialysis, appears to function in a stable fashion. It is impressive that they found it necessary to calibrate the device only once during this period, at a mean time of 4.7 h after insertion. …