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A rapid and specific colorimetric method for free tryptophan quantification.

Yinan Wu1, Tianmin Wang1, Chong Zhang1

  • 1MOE Key Laboratory for Industrial Biocatalysis, Department of Chemical Engineering, Center for Synthetic & System Biology, Tsinghua University, Beijing 100084, China.

Talanta
|September 18, 2017
PubMed
Summary
This summary is machine-generated.

A new, rapid colorimetric method accurately quantifies free tryptophan in biological samples. This simple spectrometry technique is suitable for common labs, aiding research in medicine and biotechnology.

Keywords:
Bioanalytical chemistryColorimetric methodsFree tryptophan quantificationIndole-hydroxylamine chemistry

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Area of Science:

  • Biochemistry
  • Analytical Chemistry

Background:

  • Tryptophan is an essential amino acid vital for human health and has commercial applications in biotechnology.
  • Existing methods for tryptophan quantification are often time-consuming or require specialized equipment, necessitating a simpler, faster approach.

Purpose of the Study:

  • To develop a rapid, specific, and accessible colorimetric method for free tryptophan quantification.
  • To enable high-throughput analysis of tryptophan in various biological samples.

Main Methods:

  • Enzymatic conversion of tryptophan to indole using purified tryptophanases.
  • Colorimetric detection of indole with hydroxylamine, forming a pink product measured at 530nm.
  • Validation using spectrometry and comparison with High-Performance Liquid Chromatography (HPLC).

Main Results:

  • The method demonstrated a linear detection range of 100μM to 600μM (R² = 0.9969).
  • No cross-reactivity was observed with other amino acids or protein-bound tryptophan.
  • Quantification in complex biological samples showed high correlation (R=0.93) with HPLC results.

Conclusions:

  • The developed colorimetric method offers a simple, rapid, and robust solution for free tryptophan quantification.
  • Its high-throughput capability makes it suitable for routine analysis in diverse research fields like medicine, microbiology, and metabolic engineering.