Uchicago Argonne, LLC

The University of Chicago

Alexander Kukhtin

Gennadiy M Yershov

Oleg Alferov

Boris K Chernov

Julia B Golova

Darrell P Chandler

Multiplexed affinity purification and thermal dissociation prior to biochip hybridization simplifies uncharacterized sample admixtures, thereby minimizing or eliminating sample interferents, improving hybridization specificity on a microarray detector, and minimizing or eliminating the need for post-hybridization thermal dissociation analysis. An integrated thermo-affinity sample preparation sub-circuit for sample purification and enrichment is described that is consistent with a field-portable form factor and analytical processes. Thermo-affinity sample preparation on model admixtures of varying complexity was efficacious.

Nucleic acid sample purification and enrichment with a thermo-affinity microfluidic sub-circuit

A method of illumination and illumination apparatus are provided in a biochip reader. Illumination is provided by a non-collimated laser source or a light emitting diode (LED). The light is directed to opposing sides of a glass substrate by a pair of optical fiber bundles. The glass substrate carries a bioarray. Each of the optical fiber bundles are splayed out to make a fan, the fan being one fiber thick and defining a line of optical fiber faces. This process randomizes any non-uniformity in the illumination source, creating a more uniform illumination source. A respective divergent diffuser engages each row of optical fiber faces coupling and diffusing light substantially evenly through the opposing sides of the glass substrate to illuminate the bioarray supported by the glass substrate. The glass substrate functions as a secondary light guide. The divergent diffusers separate the optical fiber faces from the edges of the glass substrate, protecting the optical fibers from mechanical damage. A glass holder supports the glass substrate carrying the bioarray. The glass holder including a plastics springs member in spring contact engagement with the glass substrate for positioning said bioarray in a focal plane. Light also can be directed to opposing ends of the glass substrate by a second pair of optical fiber bundles. Also a single optical fiber bundle can be used to direct light in one side of the glass substrate or three optical fiber bundles can be used to direct light into the glass substrate. This method of illumination provides a superior signal to noise ratio as compared with conventional illumination systems.

Biochip reader with enhanced illumination and bioarray positioning apparatus

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Hinsdale, IL, United States of America

Alexander Kukhtin