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Airborne cell analysis

  • Sabina Santesson
  • Martin Andersson
  • Eva Degerman
  • Thomas Johansson
  • Johan Nilsson
  • Staffan Nilsson
Publishing year: 2000
Language: English
Pages: 3412-3418
Publication/Series: Analytical Chemistry
Volume: 72
Issue: 15
Document type: Journal article
Publisher: The American Chemical Society

Abstract english

A miniaturized analysis system for the study of living cells and biochemical reactions in microdroplets was developed. The technique utilizes an in-house-developed piezoelectric flow-through droplet dispenser for precise reagent supply and an ultrasonic levitator for contactless sample handling. A few-cell study was performed with living primary adipocytes. Droplets (500 nL) containing 3-15 individual cells were acoustically levitated. The addition of beta-adrenergic agonists into the levitated droplet using the droplet dispenser stimulated adipocyte lipolysis, leading to free fatty acid release and a consequent pH decrease of the surrounding buffer. The addition of insulin antagonized lipolysis and hence also the decrease in pH. The changes in pH, i.e., the cell response in the droplet, were followed using a pH-dependent fluorophore continuously monitored by fluorescence imaging detection. An image analysis computer program was employed to calculate the droplet intensities. To counteract droplet evaporation, found to affect the fluorescence intensities, a separate dispenser was used to continually add water, thus keeping the droplet volume constant.


  • Analytical Chemistry


  • Insulin Signal Transduction
  • ISSN: 1520-6882
Eva Degerman
E-mail: eva [dot] degerman [at] med [dot] lu [dot] se


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