Airborne cell analysis
Author
Summary, in 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.
Department/s
Publishing year
2000
Language
English
Pages
3412-3418
Publication/Series
Analytical Chemistry
Volume
72
Issue
15
Full text
- Available as PDF - 126 kB
- Download statistics
Document type
Journal article
Publisher
The American Chemical Society (ACS)
Topic
- Analytical Chemistry
Status
Published
Research group
- Insulin Signal Transduction
ISBN/ISSN/Other
- ISSN: 1520-6882