There are several commercial piezoelectric biosensors available from companies such as Elchema (Potsdam, NY) and Maxtek (Torrance, CA) which have been used to test for substances like estrogen and organophosphates (29, 102)
- Carmon, K. S., R.E. Baltus, and L.A. Luck. 2005. A biosensor for estrogenic substances using the quartz crystal microbalance. Anal. Biochem. 345: 277-283.
- Halamek, J., J. Pribyl, A. Makower, P. Skladal, and F.W. Scheller. 2005. Sensitive detection of organophosphates in river water by means of a piezoelectric biosensor. Anal. Bioanal. Chem. 382: 1904-1911.
This is increasingly greek to me, but i think they're using instruments like this: http://www.elchema.com/EQCN.htm