A comparative study of the analysis of human urine headspace using gas chromatography-mass spectrometry.

A comparative study of the analysis of human urine headspace using gas chromatography-mass spectrometry.

Journal of breath research (2008-09-01)

S Smith, H Burden, R Persad, K Whittington, B de Lacy Costello, N M Ratcliffe, C S Probert

ABSTRACT

First-void urine samples were obtained from 24 elderly, asymptomatic men (median age 62.9 years). The headspace above pH adjusted urine samples were extracted using a carboxen/polydimethylsiloxane solid phase micro-extraction fibre and the volatile organic compounds analysed by gas chromatography/mass spectrometry. A total of 147 compounds were identified in the headspace of urine. The acidified samples recorded a total of 92 compounds, 27 of which were ubiquitous, basified samples 70 compounds, with 12 ubiquitous and unmodified pH samples 49, with 6 ubiquitous. Five compounds were ubiquitous irrespective of pH: acetone, methylene chloride, 4-heptanone, 2-pentanone and 2-butanone. A comparative analysis of unfrozen and frozen-thawed urine (stored at room temperature for 0, 1 and 8 h) showed that samples retained the same number of compounds although variations in the peak areas for some compounds were observed.

MATERIALS

Product Number

Brand

Product Description

57928-U

Supelco

SPME fiber assembly Polydimethylsiloxane (PDMS), metal alloy fiber, d_f 100 μm(PDMS, needle size 23 ga, for use with autosampler

54041-U

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Carboxen^® 1000 Reversible SPE Tube, 200 mg/mL, pk 30

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57914-U

Supelco

SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), for use with autosampler, needle size 23 ga, metal alloy fiber, fiber L 2 cm

57912-U

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SPME fiber assembly Divinylbenzene/Carboxen/Polydimethylsiloxane (DVB/CAR/PDMS), needle size 23 ga, metal alloy fiber, for use with autosampler, fiber L 1 cm, pkg of 1 × ea

57906-U

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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), d_f 85 μm(CAR/PDMS, for use with autosampler, needle size 23 ga, metal alloy fiber

57335-U

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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), d_f 85 μm(CAR/PDMS, needle size 24 ga, StableFlex, for use with autosampler

57342-U

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SPME fiber assembly Polydimethylsiloxane (PDMS), d_f 100 μm(PDMS, for use with manual holder, needle size 23 ga

57299-U

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10478-U

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Carboxen^® Adsorbent, matrix Carboxen^® 1000, 60-80 mesh, bottle of 10 g

504823

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57300-U

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SPME fiber assembly Polydimethylsiloxane (PDMS), d_f 100 μm(PDMS, needle size 24 ga, for use with manual holder

57354-U

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SPME fiber assembly, Carbowax-Polyethylene Glycol (PEG) Coating, needle size 23 ga, d_f 60 μm(PEG, for use with autosampler

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57318

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SPME fiber assembly Carboxen/Polydimethylsiloxane (CAR/PDMS), d_f 75 μm(CAR/PDMS, for use with manual holder, needle size 24 ga

57302

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57319

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57303

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SPME Fiber Assembly Polydimethylsiloxane/Divinylbenzene (PDMS/DVB), d_f 65 μm(PDMS/DVB, needle size 23 ga, PDMS/DVB StableFlex, for use with autosampler

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SPME fiber assembly polyacrylate (PA), d_f 85 μm(PA, for use with autosampler, needle size 23 ga