Sensor for ampicillin based on a microwave electrodynamic resonator.

07:00 EST 21st January 2019 | BioPortfolio

Summary of "Sensor for ampicillin based on a microwave electrodynamic resonator."

The paper describes a new biological sensor which represents a resonator based on a segment of a rectangular waveguide of 8 GHz band with shear dimensions of 28.5 × 12.6 mm. On one side, the resonator is bounded by a metallic short-circuited wall; on the other side, it is bounded by a lithium niobate plate with a porous polystyrene film. This film, applied by centrifugation and modified in high-frequency discharge plasma in argon, was used to immobilize cells of Escherichia coli K-12. This resonator was connected through a coaxial-waveguide adapter to the S parameter meter, by means of which the reflection coefficient S in the plane of the lithium niobate plate was measured. The addition of an aqueous solution of ampicillin at 4-50 μg/ml to immobilized cells led to a significant change in the reflection coefficient of S from - 10.15 dB to - 15.09 dB. At the same time, the resonance frequency changed insignificantly within the range 8.06-8.068 GHz. The optimal time for modifying the polystyrene film for obtaining the required porosity and the optimal time for the immobilization of the bacterial cells were determined. The immobilized cells retained their activity for 4 months at a temperature of 4 °C. The study showed the promise of such a biosensor to determine β-lactam antibiotics in aqueous solutions by using ampicillin as an example. The limit of detection of the developed biosensor with respect to ampicillin was established (4 μg/ml).


Journal Details

This article was published in the following journal.

Name: Biosensors & bioelectronics
ISSN: 1873-4235
Pages: 95-102


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Medical and Biotech [MESH] Definitions

An ester of AMPICILLIN which is readily hydrolysed on absorption to release ampicillin. It is well absorbed from the gastrointestinal tract resulting in a greater bioavailability of ampicillin than can be achieved with equivalent doses of ampicillin.

Nonsusceptibility of a microbe to the action of ampicillin, a penicillin derivative that interferes with cell wall synthesis.

A family of intracellular calcium-sensing proteins found predominately in NEURONS and PHOTORECEPTOR CELLS. They contain EF HAND MOTIFS and undergo conformational changes upon calcium-binding. Neuronal calcium-sensor proteins interact with other regulatory proteins to mediate physiological responses to a change in intracellular calcium concentration.

Pivalate ester analog of AMPICILLIN.

A semisynthetic ampicillin-derived acylureido penicillin.

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