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Surface Enzyme Chemistries for Ultrasensitive Microarray Biosensing with SPR Imaging.

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Summary
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Surface plasmon resonance imaging (SPRI) biosensing is enhanced using enzymes to detect DNA, RNA, and proteins at femtomolar levels. Novel methods enable on-chip biosynthesis of microarrays for real-time bioaffinity sensing.

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Area of Science:

  • Biotechnology
  • Biosensing
  • Molecular Biology

Background:

  • Surface plasmon resonance imaging (SPRI) biosensing offers sensitive detection but can be limited in selectivity and sensitivity.
  • Nucleic acid enzymes like ligases, nucleases, and polymerases can modify surface-bound nucleic acids, presenting opportunities for enhanced biosensing strategies.

Purpose of the Study:

  • To explore and demonstrate novel detection strategies for SPRI biosensing by leveraging surface enzyme chemistries.
  • To develop highly sensitive and selective methods for detecting nucleic acids and proteins using SPRI.
  • To create integrated systems for on-chip biosynthesis and real-time sensing.

Main Methods:

  • Utilizing nucleic acid ligases, nucleases, and polymerases to manipulate surface-bound DNA and RNA for enhanced SPRI signals.
  • Implementing a dual-element generator-detector microarray approach for coupled adsorption and nanoparticle-enhanced SPRI measurements.
  • Integrating transcription and translation from surface-bound DNA templates for on-chip aptamer and protein microarray biosynthesis.

Main Results:

  • Achieved quantitative detection of DNA, RNA, and proteins at femtomolar concentrations using the dual-element SPRI approach.
  • Demonstrated drastically enhanced sensitivity and unique selectivity in SPRI biosensing through enzyme-based strategies.
  • Successfully developed an on-chip multiplexed biosynthesis method for creating functional aptamer and protein microarrays.

Conclusions:

  • Surface enzyme chemistries significantly enhance the sensitivity and selectivity of SPRI biosensing.
  • The dual-element microarray and on-chip biosynthesis methods enable advanced, real-time bioaffinity sensing applications.
  • This work presents a versatile platform for femtomolar detection and integrated microarray fabrication for diverse biomolecules.