ISSN:
1573-0972
Keywords:
Bacterial immobilized cells
;
liquid-drying
;
preservation
;
microbial biosensors
;
xenobiotics detection
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
Abstract A simple and effective method for the drying of immobilized bacterial cells to be used directly in a microbial biosensor for measurement of activity is reported. As a case example, plasmid-bearing cells of Alcaligenes eutrophus JMP 134, DSM 4058 were immobilized on various carriers and liquid-dried. The dried cell-matrix was used directly after rehydration/reactivation as the biological component of a biosensor for determining the concentration of xenobiotic compounds in the environment. Good viability results were obtained after long-term storage and cells exhibited no loss of plasmids responsible for the 2,4-dichlorophenoxyacetic acid (2,4-D) degradation. The activity of the cells for 2,4-D was proved using a respiration electrode. No time-consuming, repeated cell cultivation and harvesting was required, as the cells preserved from a single batch served as a continuous source for activity measurements. Many other microbial cultures can be preserved by this method and the cells preserved in the form of immobilized dried cell-matrix can be used directly to perform enzymatic tests, complex biochemical conversions and for production in the reactors. The dried cell-matrix can serve as a stable interchangeable component for a multipurpose biosensor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00327847
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