Abstract: A method of detecting a target substance includes contacting the target substance with a substrate. The substrate has a first receptor bound to the substrate. The target substance binds to the first receptor. The method further includes contacting a second receptor with the substrate. The second receptor is associated with the target substance. The second receptor is biotinylated. The method also includes contacting an anti-biotin antibody conjugated paramagnetic particle with the substrate.

Abstract: A method for identifying aptamers that bind to target molecules may include contacting an oligonucleotide library with target molecule and digesting unbound oligonucleotides with one or more endonucleases, one or more exonucleases, or one or more endonucleases in combination with one or more exonucleases. A method for identifying aptamers may further include optionally subjecting selected aptamers to one or more rounds of selection under conditions of increased stringency. A method for identifying aptamers may include yet further amplifying selected aptamers. The described methods may be performed in a screen for identifying aptamers either alone or in combination with other methods typically employed in the art for selecting aptamers (such as, e.g., SELEX). Also contemplated herein are systems and kits for accomplishing the above.

Abstract: A method for identifying aptamers that bind to target molecules may include contacting an oligonucleotide library with target molecule and digesting unbound oligonucleotides with one or more endonucleases, one or more exonucleases, or one or more endonucleases in combination with one or more exonucleases. A method for identifying aptamers may further include optionally subjecting selected aptamers to one or more rounds of selection under conditions of increased stringency. A method for identifying aptamers may include yet further amplifying selected aptamers. The described methods may be performed in a screen for identifying aptamers either alone or in combination with other methods typically employed in the art for selecting aptamers (such as, e.g., SELEX). Also contemplated herein are systems and kits for accomplishing the above.

Abstract: A method of detecting a target substance includes contacting the target substance with a substrate. The substrate has a first receptor bound to the substrate. The target substance binds to the first receptor. The method further includes contacting a second receptor with the substrate. The second receptor is associated with the target substance. The second receptor is biotinylated. The method also includes contacting an anti-biotin antibody conjugated paramagnetic particle with the substrate.