Disposable sensor for use in measuring an analyte in a gaseous sample
The present invention is a disposable sensor for use with a device that quantifies analytes in a gaseous sample. It comprises (i) a sensing element, (ii) a means for interfacing the disposable sensor with a gas analysis device, and (iii) a housing. When used with a device that can quantify the concentration of an analyte in a gas sample, the present invention facilitates the use of exhaled breath analysis as a clinical tool.
1. A sensor for use with a device that quantifies the concentration of nitric oxide in a range of 5 to 200 ppb in a gaseous sample of exhaled breath, comprising:
a housing;
a disposable sensor within said housing and removable therefrom for replacement by a second disposable sensor, each said disposable sensor comprising a sensing element comprising cytochrome-c in a sol-gel, said cytochrome-c undergoing a change in the presence of 5 to 200 ppb of nitric oxide; and
a first sample conditioning unit within said housing.
2. The sensor according to claim 1 , wherein said sample conditioning unit comprises zeolite (5A or 13x), a silica gel, or another desiccant.
3. The sensor according to claim 1 , wherein said sample conditioning comprises potassium permanganate combined with charcoal or zeolite 3A.
4. The sensor according to claim 1 , additionally comprising a second sample conditioning unit, wherein said first sample conditioning unit is for use in measuring a first analyte, and said second sample conditioning unit is for use in measuring a second analyte.