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Biomedical Microdevices

, 21:96 | Cite as

Isothermal titration calorimetry in a 3D-printed microdevice

  • Yuan Jia
  • Chao Su
  • Maogang He
  • Kun Liu
  • Hao Sun
  • Qiao LinEmail author
Article
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Abstract

Isothermal titration calorimetry (ITC) can benefit from operating in miniaturized devices as they enable quantitative, low-cost measurements with reduced analysis time and reagents consumption. However, most of the existing devices that offer ITC capabilities either do not yet allow proper control of reaction conditions or are limited by issues such as evaporation or surface adsorption caused inaccurate solution concentration information and unintended changes in biomolecular properties because of aggregation. In this paper, we present a microdevice that combines 3D-printed microfluidic structures with a polymer-based MEMS thermoelectric sensor to enable quantitative ITC measurements of biomolecular interactions. Benefitting from the geometric flexibility of 3D-printing, the microfluidic design features calorimetric chambers in a differential cantilever configuration that improves the thermal insulation and reduces the thermal mass of the implementing device. Also, 3D-printing microfluidic structures use non-permeable materials to avoid potential adsorption. Finally, the robustness of the polymeric MEMS sensor chip allows the device to be assembled reversibly and leak-free, and hence reusable. We demonstrate the utility of the device by quantitative ITC characterization of a biomolecular binding system, ribonuclease A (RNase A) bind with cytidine 2′-monophosphate (2’CMP) down to a practically useful sample concentration of 0.2 mM. The thermodynamic parameters of the binding system, including the stoichiometry, equilibrium binding constant, and enthalpy change are obtained and found to agree with values previously reported in the literature.

Keywords

3D-printed microfluidic structures Isothermal titration calorimeter MEMS thermoelectric sensor Polymer substrate 
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Notes

Acknowledgments

This work was jointly supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20180384); the National Natural Science Foundation of China (Grant No. 61604042); Fundamental Research for the Central Universities of China (Grant No. N160302001); the Natural Science Foundation of Fujian Province (Grant No. 2017 J01501).

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Yuan Jia
    • 1
    • 2
  • Chao Su
    • 2
    • 3
  • Maogang He
    • 4
  • Kun Liu
    • 5
  • Hao Sun
    • 6
  • Qiao Lin
    • 2
    Email author
  1. 1.School of Mechanical EngineeringSoutheast UniversityNanjingChina
  2. 2.Department of Mechanical EngineeringColumbia UniversityNew YorkUSA
  3. 3.School of Mechanics, Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’anChina
  4. 4.Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of EducationXi’an Jiaotong UniversityXi’anChina
  5. 5.School of Mechanical Engineering and AutomationNortheastern UniversityShenyangChina
  6. 6.School of Mechanical Engineering and AutomationFuzhou UniversityFuzhouChina

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