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Analytical and Bioanalytical Chemistry

, Volume 394, Issue 2, pp 523–528 | Cite as

Pollen-imprinted polyurethanes for QCM allergen sensors

  • Michael Jenik
  • Alexandra Seifner
  • Peter Lieberzeit
  • Franz L. DickertEmail author
Original Paper

Abstract

Molecularly imprinted polymers for detecting plant pollen were designed as artificial recognition materials for quartz crystal microbalances in the gaseous phase. Imprints of birch (diameter, 25 μm) and nettle (diameter, 15 μm) pollen can be generated by polydimethylsiloxane stamping technique as proven by atomic force microscopy. If pollen grains are able to access the cavities and thus are incorporated, the resulting sensors display Sauerbrey-like negative frequency shifts. Non-Sauerbrey behaviour can be observed as soon as pollen is prevented from entering the selective hollows: this results in grain mobility on the electrode surface leading to frequency increases. Access to the cavities is determined by the diameter ratio between pollen grains and imprints as can be revealed during cross-selectivity measurements of nettle and birch pollen imprinted layers. When the amount of pollen grains on the electrode surface exceeds the number of available imprints, the excess particles move freely, resulting in positive, non-Sauerbrey frequency shifts.

Keywords

Molecular imprinting Plant pollen QCM Non-Sauerbrey behaviour 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Michael Jenik
    • 1
  • Alexandra Seifner
    • 1
  • Peter Lieberzeit
    • 1
  • Franz L. Dickert
    • 1
    Email author
  1. 1.Department of Analytical Chemistry and Food ChemistryUniversity of ViennaViennaAustria

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