Differentially encoded biological analyzer planar array apparatus and methods
A method of probing a plurality of analyzer molecules distributed about a detection platform is disclosed. The method includes contacting a test sample to the plurality of analyzer molecules, scanning the plurality of analyzer molecules at a rate relating to a carrier frequency signal, and detecting the presence or absence of a biological molecule based at least in part upon the presence or absence of a signal substantially at a sideband of the carrier frequency signal. A molecule detection platform including a substrate and a plurality of targets positioned about the substrate is also disclosed. Specific analyzer molecules adapted to bind a specific analyte are immobilized about a first set of the targets. Nonspecific analyzer molecules are immobilized about a second set of the targets. The targets positioned about the substrate along at least a segment of a scanning pathway alternate between at least one of the first set and at least one of the second set. A method including providing a substrate for supporting biological analyzer molecules the substrate including at least one scanning pathway is also disclosed. The scanning pathway includes a plurality of scanning targets. Specific biological analyzer molecules adapted to detect a specific target analyte are distributed about a first set of the targets which alternate in groups of at least one with a second set of the targets the second set of the targets not including the specific biological analyzer molecules.
1. A method of detecting a target analyte in a test sample, the method comprising:
providing a substrate for supporting biological analyzer molecules, the substrate including at least one scanning pathway,
locating a plurality of scanning targets along the scanning pathway, the plurality of scanning targets alternating periodically between a group of a first set of targets and a group of a second set of targets, the first set of targets including specific biological analyzer molecules adapted to detect the target analyte, and the second set of the targets not including the specific biological analyzer molecules;
contacting a test sample to the plurality of scanning targets;
scanning the plurality of scanning targets along the at least one scanning pathway at a rate to create a carrier frequency signal and sideband signals, the binding of the target analyte to the specific analyzer molecules of the first set of targets modulating the carrier frequency signal to create the sideband signals;
detecting the sideband signals; and
determining the presence or absence of the target analyte in the test sample based on the sideband signals.
2. The method of claim 1 , wherein the detecting step utilizes self referencing phase quadrature interferometric detection.
3. The method of claim 1 , wherein the substrate is a bio-CD.
4. The method of claim 1 , further comprising suppressing the carrier frequency signal.
5. The method of claim 1 , wherein the detecting step utilizes interferometry and the scanning step utilizes a laser beam.
6. The method of claim 1 , further comprising detecting the presence or absence of a second target analyte in the test sample, wherein detecting the second target analyte is based at least in part on the sideband signals.
7. The method of claim 1 , wherein the detecting step includes detecting a harmonic signal closest to zero frequency.
8. The method of claim 1 , wherein the detecting step includes detecting a harmonic signal at a frequency greater than that of a harmonic signal closest to zero frequency.
9. The method of claim 1 , wherein the detecting step utilizes fluorescence detection to detect the sideband signals.