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Two techniques to sample non-volatiles in breath-exemplified by methadone.

Journal article
Authors Göran Ljungkvist
Shahid Ullah
Åsa Tinglev
Karina Stein
Björn Bake
Per Larsson
Ann-Charlotte Almstrand
Emilia Viklund
Oscar Hammar
Sören Sandqvist
Olof Beck
Anna-Carin Olin
Published in Journal of breath research
Volume 12
Issue 1
Pages 016011
ISSN 1752-7163
Publication year 2018
Published at Institute of Medicine, Department of Public Health and Community Medicine
Institute of Medicine, Department of Public Health and Community Medicine, Section of Occupational and environmental medicine
Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
Pages 016011
Language en
Links dx.doi.org/10.1088/1752-7163/aa8b25
www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords exhaled breath, endogenous particles, particle collection, exogenous compounds
Subject categories Other Medical Sciences

Abstract

The particles in exhaled breath provide a promising matrix for the monitoring of pathological processes in the airways, and also allow exposure to exogenous compounds to be to assessed. The collection is easy to perform and is non-invasive. The aim of the present study is to assess if an exogenous compound-methadone-is distributed in the lining fluid of small airways, and to compare two methods for collecting methadone in particles in exhaled breath. Exhaled particles were collected from 13 subjects receiving methadone maintenance treatment. Two different sampling methods were applied: one based on electret filtration, potentially collecting exhaled particles of all sizes, and one based on impaction, collecting particles in the size range of 0.5-7 μm, known to reflect the respiratory tract lining fluid from the small airways. The collected samples were analyzed by liquid chromatography mass spectrometry, and the impact of different breathing patterns was also investigated. The potential contribution from the oral cavity was investigated by rinsing the mouth with a codeine solution, followed by codeine analysis of the collected exhaled particles by both sampling methods. The results showed that methadone was present in all samples using both methods, but when using the method based on impaction, the concentration of methadone in exhaled breath was less than 1% of the concentration collected by the method based on filtration. Optimizing the breathing pattern to retrieve particles from small airways did not increase the amount of exhaled methadone collected by the filtration method. The contamination from codeine present in the oral cavity was only detected in samples collected by the impaction method. We conclude that methadone is distributed in the respiratory tract lining fluid of small airways. The samples collected by the filtration method most likely contained a contribution from the upper airways/oral fluid in contrast to the impaction method.

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