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Sci Rep

Title:		"Exploring the potential of NTME/GC-MS, in the establishment of urinary volatomic profiles. Lung cancer patients as case study"
Author(s):		Porto-Figueira P; Pereira J; Miekisch W; Camara JS;
Address:		"CQM - Centro de Quimica da Madeira, Universidade da Madeira, Campus Universitario da Penteada, 9020-105, Funchal, Portugal. Department of Anaesthesiology and Intensive Care Medicine, Rostock Medical Breath Research Analytics and Technologies (ROMBAT), University Medicine Rostock, Rostock, Germany. CQM - Centro de Quimica da Madeira, Universidade da Madeira, Campus Universitario da Penteada, 9020-105, Funchal, Portugal. jsc@staff.uma.pt. Faculdade de Ciencias Exatas e da Engenharia da Universidade da Madeira, Campus Universitario da Penteada, 9020-105, Funchal, Portugal. jsc@staff.uma.pt"
Journal Title:		Sci Rep
Year:		2018
Volume:		20180830
Issue:		1
Page Number:		13113 -
DOI:		10.1038/s41598-018-31380-y
ISSN/ISBN:		2045-2322 (Electronic) 2045-2322 (Linking)
Abstract:		"The growing cancer incidence and mortality worldwide claims for the development of novel diagnostic strategies. In this study we aimed to explore the potential of an innovative methodology, based on a needle trap microextraction (NTME), combined with gas chromatography-mass spectrometry (GC-MS), as new approach to isolate and profile urinary volatile organic metabolites (VOMs) from lung cancer (LC) patients and healthy individuals (CTRL). In this context, different experimental parameters with influence of NTME extraction efficiency including, temperature, equilibration time, headspace volume, ionic strength, pH, effects of sample volume and stirring, were investigated and optimized. For the DVB/CarX/Car1000 needle trap device (NTD), the best results were obtained using 40 mL headspace of a 4-mL acidified (pH = 2) urine sample with 20% NaCl and an extraction temperature of 50 degrees C for 40 min of equilibration time. The stability of the isolated VOMs was investigated up to 72 h after extraction. From the VOMs identified, belonging namely to ketones, sulphur and benzene derivatives, 98 presented a frequency of occurrence above 90%. Data were processed by discriminant analysis, retrieving differentiated clusters for LC and CTRL groups. As far we are aware, this is the first study using NTME/GC-MS to establish urinary volatomic profiles. Preliminary results are very promising, as broad and comprehensive volatile profiles were obtained. Moreover, the extended storage stability of the NTD devices opens new opportunities for sampling other matrices in a wide range of applications"
Keywords:		Adolescent Adult Aged Discriminant Analysis Female Gas Chromatography-Mass Spectrometry/*methods Humans Hydrogen-Ion Concentration Least-Squares Analysis Lung Neoplasms/*urine Male *Metabolomics Middle Aged Solid Phase Microextraction/*methods Volatile Or;
Notes:		"MedlinePorto-Figueira, Priscilla Pereira, Jorge Miekisch, Wolfram Camara, Jose S eng Research Support, Non-U.S. Gov't England 2018/09/01 Sci Rep. 2018 Aug 30; 8(1):13113. doi: 10.1038/s41598-018-31380-y"