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Rigshospitalet - a part of Copenhagen University Hospital
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Towards quantitative SERS detection of hydrogen cyanide at ppb level for human breath analysis

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  1. Primary ciliary dyskinesia patients have the same P. aeruginosa clone in sinuses and lungs

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  2. Structure of Pseudomonas aeruginosa ribosomes from an aminoglycoside-resistant clinical isolate

    Research output: Contribution to journalJournal articleResearchpeer-review

  3. Filamentous bacteriophages are associated with chronic Pseudomonas lung infections and antibiotic resistance in cystic fibrosis

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  • Rikke Kragh Lauridsen
  • Tomas Rindzevicius
  • Søren Molin
  • Helle Krogh Johansen
  • Rolf Willestofte Berg
  • Tommy Sonne Alstrøm
  • Kristoffer Almdal
  • Flemming Nørnberg Larsen
  • Michael Stenbæk Schmidt
  • Anja Boisen
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Lung infections with Pseudomonas aeruginosa (PA) is the most common cause of morbidity and mortality in cystic fibrosis (CF) patients. Due to its ready adaptation to the dehydrated mucosa of CF airways, PA infections tend to become chronic, eventually killing the patient. Hydrogen cyanide (HCN) at ppb level has been reported to be a PA biomarker. For early PA detection in CF children not yet chronically lung infected a non-invasive Surface-Enhanced Raman Spectroscopy (SERS)-based breath nanosensor is being developed. The triple bond between C and N in cyanide, with its characteristic band at ~2133cm<sup>-1</sup>, is an excellent case for the SERS-based detection due to the infrequent occurrence of triple bonds in nature. For demonstration of direct HCN detection in the gas phase, a gold-coated silicon nanopillar substrate was exposed to 5ppm HCN in N<inf>2</inf>. Results showed that HCN adsorbed on the SERS substrate can be consistently detected under different experimental conditions and up to 9days after exposure. For detection of lower cyanide concentrations serial dilution experiments using potassium cyanide (KCN) demonstrated cyanide quantification down to 1μM in solution (corresponding to 18ppb). Lower KCN concentrations of 10 and 100nM (corresponding to 0.18 and 1.8ppb) produced SERS intensities that were relatively similar to the reference signal. Since HCN concentration in the breath of PA colonized CF children is reported to be ~13.5ppb, the detection of cyanide is within the required range.

Original languageEnglish
JournalSensing and Bio-Sensing Research
Volume5
Pages (from-to)84-89
Number of pages6
DOIs
Publication statusPublished - 1 Sep 2015

    Research areas

  • Breath analysis, Cystic fibrosis, Hydrogen cyanide, Pseudomonas aeruginosa, Surface-Enhanced Raman Spectroscopy

ID: 46286868