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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Visible Light-Driven Direct Colorimetric Detection of Nitrite with 3,3',5,5'-Tetramethylbenzidine.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Spectroscopy

Background:

  • 3,3',5,5'-tetramethylbenzidine (TMB) is used in colorimetric nitrite assays.
  • Existing TMB-based nitrite assays and their mechanisms are controversial.
  • Classical Griess assay is a standard for nitrite detection.

Purpose of the Study:

  • To elucidate the reaction mechanism between TMB and nitrite.
  • To identify the final product of the TMB-nitrite reaction.
  • To develop an improved TMB-based colorimetric nitrite assay.

Main Methods:

  • Electrospray ionization mass spectrometry (ESI-MS) for reaction product identification.
  • Spectrophotometry for colorimetric detection.
  • Blue LED irradiation to enhance reaction kinetics.

Main Results:

  • Nitrite reacts with TMB via diazotization, forming yellow diazo-TMB, not TMB2+.
  • Visible light promotes diazo-TMB to an excited state, leading to TMB+• formation via photoreduction or photosensitized oxidation.
  • A light-driven assay achieved a 0.1 μM limit of detection for nitrite.

Conclusions:

  • The reaction mechanism of TMB with nitrite is clarified, involving diazotization and light-induced oxidation.
  • A novel, sensitive, light-enhanced colorimetric assay for nitrite detection was developed.
  • The assay shows potential for detecting nitrite in urine samples and diagnosing urinary tract infections.