Proteolipid Membrane and Lipid Membrane Biosensor
The invention provides compositions and methods for detection of interaction of molecules.
1 . A method of detecting a chemical or physical interaction of a lipid layer with a species, wherein the lipid layer is immobilized to a calorimetric resonant biosensor, wherein the calorimetric resonant biosensor has a calorimetric resonant diffractive grating surface, or wherein the lipid layer is immobilized to a grating-based waveguide biosensor, comprising contacting the lipid layer with the species and detecting the interaction of the lipid layer and the species by (a) detecting a maxima in reflected wavelength or a minima in transmitted wavelength of light used to illuminate the biosensor, wherein if the wavelength of light is shifted, then the species has interacted with the lipid layer; or (b) detecting a change in refractive index of light used to illuminate the biosensor, wherein a change in refractive index indicates that the species has interacted with the lipid layer.
2 . The method of claim 1 , wherein the biosensor is incorporated into the bottom of a microtiter plate or is in a microarray format.
3 . The method of claim 2 , wherein the biosensor is incorporated into the bottom of a microtiter plate, and wherein each well of the microtiter plate is about 5 to about 50 mm 2 .
4 . The method of claim 1 , wherein about 300 or more species samples can be analyzed in about ten minutes or less.
5 . The method of claim 1 , wherein the lipid layer with is contacted with the species under static conditions.
6 . The method of claim 1 , wherein the interaction of the lipid layer and the species is detected under static conditions.
7 . The method of claim 1 , wherein the surface of the biosensor comprises a titanium oxide surface, a titanium dioxide surface or a titanium phosphate surface, wherein the lipid layer is immobilized to the titanium oxide surface, to the titanium dioxide surface or to the titanium phosphate surface.
8 . The method of claim 7 , wherein the titanium oxide surface, titanium dioxide surface or titanium phosphate surface is coated with silane to form a titanium oxide-silane surface, a titanium dioxide-silane surface or a titanium phosphate-silane surface, wherein the lipid layer is immobilized to the titanium oxide-silane surface, to the titanium dioxide-silane surface or to the titanium phosphate-silane surface.
9 . The method of claim 1 , wherein the lipid layer is hetero-functional lipids, homo-functional lipids, phospholipids, cholesterol, single-chain amphiphiles, double-chain amphiphiles, micelle forming compounds, or liposome forming materials.
10 . The method of claim 1 , wherein the lipid layer and the species are label-free.
11 . The method of claim 1 , wherein the lipid layer is a lipid bilayer or a lipid monolayer that comprises carbohydrates, proteins, sugars, G-coupled receptors, ion channels, other biological molecules, or a combination thereof.
12 . The method of claim 1 , wherein the biosensor is coated with one or more surfactants.
13 . The method of claim 8 , wherein the titanium dioxide-silane surface, titanium oxide-silane surface, or titanium phosphate-silane surface is coated with block copolymers of polyethylene oxide and polypropylene oxide in the form of PEO(a)-PPO(b)-PEO(a).