Efficacy of Two Breath Condensers: An in Vitro Comparative Study
2008 (English)Article in journal (Refereed) Submitted
Examination of exhaled breath condensate (EBC) has been suggested to give information about inflammatory airway diseases.
The aim of the present study was to compare efficacy and variability in gain of two commercially available condensers, ECoScreen® [E] and RTube™ [R] in an in vitro experimental set up.
Methods: Test-fluids containing myeloperoxidase (MPO) or human neutrophil lipocalin (HNL) in addition to saline and bovine serum albumin (BSA) were nebulized. The aerosol was intermittently driven forward by a servoventilator fed by room tempered air, to reach the condenser. Two different concentrations of saline were also dispensed via the same equipment. Analyses of MPO, HNL and chlorine were done by means of ELISA, RIA or a modified adsorbed organic halogen technique (AOX), respectively.
Results: Significantly higher volumes were recovered by ECoScreen than by RTube during 20-minutes experiments (p<0.001) but not in ten-minute experiments (p>0.05). Based on changes of source concentrations in the nebulizer cup, resulting from nebulization per se, recoveries of HNL tended to be higher by E than by R (p<0.05). In contrast there were no significant differences between condensers in recoveries of MPO or chlorine. The spread of data was wide regarding all tested compounds and of similar degree for both condensers, despite acceptable inter-assay coefficients of variations of all analyses.
Conclusion: Condensing efficacy tended to be larger using E than R but there was a large variability in results from both condensers. Individual biomolecules may have their specific characteristics, and this must be taken into consideration when planning studies on EBC. We suggest that further methodological studies of the EBC method are warranted.
Place, publisher, year, edition, pages
Chlorine, HNL, MPO, Exhaled Breath Condensate, efficacy
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-16292OAI: oai:DiVA.org:liu-16292DiVA: diva2:133634