(1→3)-β-d-glucan as a measure of active mold
Electrokinetic devices and methods are described with the purpose of collecting assayable agents from a dielectric fluid medium. Electrokinetic flow may be induced by the use of plasma generation at high voltage electrodes and consequent transport of charged particles in an electric voltage gradient. Actively growing mold releases the carbohydrate cell wall component (1→3)-β-D-Glucan into the air. The invention recognizes that the airborne fraction is that which affects respiratory health and selectively tests for a free form which is soluble in aqueous medium. The sample to be analysed is preferably collected by the electrokinetic propulsion method described, but any air sampling method such as filtration, impactor or impingement may be applicable.
1. A method for analyzing aerosol particles, comprising capturing aerosol particles using an air sampling device, suspending said captured aerosol particles from the air sampling device in a extraction fluid, performing centrifugation of said suspension, directly adding with no other processing all or part of supernatant from said centrifugation to a reaction mixture for analysis of said supernatant for (1→3)-β-D-glucan.
2. A method according to claim 1 wherein the air sampling device is based on electrokinetic propulsion.
3. A method according to claim 1 where the sampling device is based on electrostatic precipitation.
4. A method according to claim 1 comprising determining (1→3)-β-D-glucan level by a limulus-amebocyte based assay.
5. A method according to claim 1 comprising determining (1→3)-β-D-glucan level by an immunoassay.
6. A method according claim 1 wherein the sampling device is based on filtration.
7. A method according claim 1 wherein the sampling device is based on impingement.
8. A method according claim 1 wherein the sampling device is based on an impactor.
9. A method for analyzing aerosol particles, comprising: capturing aerosol particles on an electrode of an electrokinetic propulsion device from a volume of air propelled electrokinetically through said device, said electrode being removably attached to a carrier mounting; removing said electrode from said carrier mounting and placing said electrode in an extraction vessel; adding a predetermined volume of extraction fluid to said extraction vessel; agitating said electrode in said neutral extraction fluid for a predetermined time; and directly adding with no other processing all or part of said neutral extraction fluid to a reaction mixture for analysis of said aerosol particles for (1→3)-β-D-glucan.
10. A method according to claim 9 comprising determining (1→3)-β-D-glucan level by a limulus-amebocyte based assay.
11. A method according to claim 9 comprising determining (1→3)-β-D-glucan level by an immunoassay.