System and method for cantilever based calorimetric analysis

• US 7,429,125 B2
• Filed: 11/09/2005
• Issued: 09/30/2008
• Est. Priority Date: 11/09/2005
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Sharma, Manish, Bratkovski, Alex, Chaiken, Alison
• Primary Examiner(s): Lefkowitz; Edward
• Assistant Examiner(s): Vaughn; Megann E
• Application Number:
  US11/270,690
• Publication Number:
  US 20070104245A1
• Time in Patent Office: 1,056 Days
• Field of Search: 374/31, 436/147
• US Class Current: 374/31
• CPC Class Codes: G01N 25/4866 by using a differential method

Abstract

A system for performing cantilever based calorimetric analysis system. A laser device is configured to emit a beam of laser energy along a beam pathway reaching from the laser device to a microcantilever. The microcantilever presents a reflective target area for the laser beam. The microcantilever deflects in response to heat. A material is provided adjacent to the target area. The material receives heat energy from the laser beam. A detector is positioned on a beam return pathway. The detector is configured to sense laser energy from the beam return pathway and provide a data single that represents calorimetric data from the material. Control circuitry is also provided to receive the data signal from the detector and process the data signal according to program logic for providing a differential scanning calorimetric analysis of the calorimetric data. An associated method of use is also provided.

Claims

1. A cantilever based calorimetric analysis system comprising:

a first laser device configured to emit a first beam of laser energy along a first beam pathway reaching from the first laser device towards a microcantilever device;

a second laser device configured to emit a second beam of laser energy along a second beam pathway reaching from the second laser device towards the microcantilever device;

the microcantilever device presenting a first surface having a first target area for the first beam and the first surface also having a second reflective target area for the second beam, such that the first target area moves in response to a heat energy function, the second target area reflecting the second beam along a beam return pathway;

a detector positioned on the beam return pathway reaching from the second target area to the detector;

the detector being configured to sense laser energy from the beam return pathway and produce a corresponding data signal that represents calorimetric data from material proximate the first target area and receiving heat energy directly from the first beam; and

circuitry configured to receive the data signal and process the data signal according to program logic for providing a differential scanning calorimetric analysis of the calorimetric data.

2. The cantilever based calorimetric analysis system of claim 1, wherein the first laser device is a heating laser device structured and arranged to provide heat energy in the form of pulsed laser energy to the first target area, each pulse having a specific duration and peak amplitude of intensity, and wherein the second laser device is structured and arranged to provide no measurable heat energy to the second reflective target area.

3. The cantilever based calorimetric analysis system of claim 1, further comprising material proximate the first target area, the material being sufficiently close to the first target area for inducing relative motion of the microcantilever device on the basis of calorimetric interaction between the material and the beam.

4. The cantilever based calorimetric analysis system of claim 3, wherein the material is selected from the group consisting of a polypeptide, a polynucleic acid, an antibody, a conformational molecule, and combinations thereof.

5. The cantilever based calorimetric analysis system of claim 4, wherein the first target area is functionalized by binding with the material.

6. The cantilever based calorimetric analysis system of claim 1, wherein the first target area further includes a depression structured and arranged to hold the material.

7. The cantilever based calorimetric analysis system of claim 1, wherein the laser device includes a laser writehead that is an adapted version of a laser writehead for use in CD-ROM applications.