An. Reshetilov et al., PSEUDOMONAS-PUTIDA AS A RECEPTOR ELEMENT OF MICROBIAL SENSOR FOR NAPHTHALENE DETECTION, Process biochemistry, 32(6), 1997, pp. 487-493
Pseudomonas putida BS238 carrying the naphthalene degradative plasmid
pBS2 was immobilized by adsorption on chromatographic paper and fixed
on the surface of a Clark electrode. Naphthalene activated the respira
tory activity of the cells, which was the basis for determining its co
ncentration in one-component aqueous media. The lower limit of naphtha
lene detection was in the region of 0.9 mu M. The maximal responses of
the sensor were observed at pH 6.0-6.2, 20-25 degrees C and a salt co
ncentration 2.9-3.2 g ion/litre. The sensor responded weakly to the pr
esence of biphenyl, monocyclic aromatic compounds, ethanol, carbohydra
tes and organic acids in the medium. A sensor based on an isogenic str
ain without plasmid pBS2 had no response to naphthalene. The possibili
ty of improving the selectivity of naphthalene detection using a pair
of sensors based on the original and isogenic strains is discussed. (C
) 1997 Elsevier Science Ltd.