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High-Frequency Heating Extraction Method for Sensitive Drug Analysis in Human Nails.

Fumiki Takahashi1, Masaru Kobayashi2, Atsushi Kobayashi3

  • 1Department of Chemistry, Faculty of Science, Shinshu University, 3-1-1 Asahi, Nagano 390-8621, Japan. takahashi@shinshu-u.ac.jp.

Molecules (Basel, Switzerland)
|December 15, 2018
PubMed
Summary
This summary is machine-generated.

A new high-frequency heating method rapidly extracts drugs from human nails. This technique significantly improves drug analysis sensitivity compared to conventional methods, enabling faster and more accurate results.

Keywords:
amlodipinecaffeinecurie temperaturehigh-frequency heatingliquid chromatography–tandem mass spectrometrynail

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Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Toxicology

Background:

  • Drug analysis in human nails is crucial for monitoring drug use and exposure.
  • Conventional extraction methods can be time-consuming and lack sensitivity.
  • Developing rapid and sensitive sample preparation techniques is essential for nail drug testing.

Purpose of the Study:

  • To develop a simple, sensitive, and rapid extraction method for drug analysis in human nails.
  • To utilize high-frequency (H-F) heating for efficient drug extraction.
  • To compare the efficiency of the new method with conventional ultrasonic irradiation extraction.

Main Methods:

  • Human nail samples were mixed with methanol and formic acid (7:3, v/v).
  • A ferromagnetic alloy (pyrofoil) was used with a Curie point pyrolyzer for H-F heating (600 kHz) at various temperatures (160-255 °C).
  • Extracted caffeine was analyzed using liquid chromatography-tandem mass spectrometry (LC-MS/MS).

Main Results:

  • Optimal extraction of caffeine was achieved at 220 °C using pyrofoil.
  • The H-F heating method yielded a five-fold increase in peak area compared to ultrasonic extraction.
  • Extraction efficiency was independent of sample particle size.
  • The method successfully extracted strongly incorporated drugs under high-pressure and high-temperature conditions.

Conclusions:

  • A rapid (3-minute H-F extraction, 20 minutes total preparation) and simple sample preparation method for drug analysis in nails was developed.
  • The H-F heating technique enables sensitive determination of target drugs in nail samples.
  • The method was successfully applied to a clinical sample from a patient with hypertension.