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A Rapid Testing Kit for 6PPD Screening in Rubber Products.

Zhuoyuan Li1, Linna Xie1, Pranav Nair1

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

Analytical Chemistry
|April 26, 2025
PubMed
Summary
This summary is machine-generated.

A new, low-cost rapid testing kit can detect N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine (6PPD) in rubber products within 10 minutes. This method offers a user-friendly alternative for environmental monitoring and product management.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • N-(1,3-dimethylbutyl)-N étaire-phenyl-p-phenylenediamine (6PPD) is a widely used rubber antioxidant.
  • Its oxidation product, 6PPD-quinone, exhibits significant aquatic toxicity, raising environmental concerns.
  • Cost-effective detection methods for 6PPD are crucial for managing rubber products and waste.

Purpose of the Study:

  • To develop a rapid, cost-effective testing kit for 6PPD detection in rubber products.
  • To identify the colored product formed during 6PPD oxidation for detection purposes.
  • To validate the performance of the developed kit against established analytical techniques.

Main Methods:

  • Development of a colorimetric assay based on 6PPD oxidation.
  • Evaluation of reaction selectivity with various phenolic and aniline compounds.
  • Application of the rapid testing kit to a diverse set of 50 rubber products.
  • Comparison of results with Liquid Chromatography-Mass Spectrometry (LC-MS) for validation.

Main Results:

  • A rapid testing kit (<10 min, <$1/sample) for 6PPD detection was successfully developed.
  • The red-colored product was identified as the protonated N-1,3-dimethyl butyl-N étaire-phenyl quinone diimine (6QDI+H+) with λmax = 490 nm.
  • 6PPD was detected in 22 out of 50 tested rubber products.
  • Excellent agreement (R² = 0.896) was observed between the rapid kit and LC-MS results.

Conclusions:

  • A user-friendly and "green" rapid testing kit for 6PPD in rubber products has been established.
  • The kit provides a reliable and accessible method for 6PPD detection, suitable for users without specialized chemistry expertise.
  • This development aids in the environmental monitoring and management of rubber products containing 6PPD.