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Product description

The last years have seen an increasing activity in the field of optical sensors.  Optical sensitive membrane is defining part of optical chemical sensor (optode) and is called transducer. It provides the molecular or ionic recognition by way of change its optical properties in dependence on the analyte. This optical signal may be absorption, emission, transmission, reflection of light by the transducer in the optode. Absorption is no doubt the most frequently used detection technique in analytical laboratories due to its high flexibility for adaptation to a wide variety of analytical problems.

Standard way of manufacture of transducer is immobilization of analytical reagent on a suitable support matrix. Both the method of immobilization and the types of support matrix determine a number of optod’s characteristics such as response times, lifetimes and also robustness.  The choice of a support matrix depends on parameters like permeability for the analyte, mechanical stability and suitability for reagent immobilization. Polymer materials are frequently used matrices for the indicator chemistry in optical sensors. By development of the sensor working on measurement absorption preference is given to the optical transparent homogeneous polymer membrane because its absorbance is measured most simply. Thereby, researches are carrying out in the field of creation of transparent matrixes which preserve both analytical properties of immobilized reagents and optical properties of initial matrix. Most of the reported transparent homogeneous polymer membranes are based on immobilized reagents into a poly(vinylchloride) matrix, Nafion  and  triacetylcellulose.

An advantage of our development is the possibility of the use of transparent polymethacrylate matrix as the universal matrix for making of wide lines of the indicated systems accompanied by portable automated analyzers. 

Research objective is development of new transparent analytical systems on the basis of polymeric matrix with immobilized reagents. Such analytical systems are widely used for the simple and fast detection and control of toxic elements (metals, organic substances) and useful substances (vitamins, microelements) in water, drinks, vegetative extracts, biological liquids and aerosols at domestic and professional level. These materials enable to solve several problems of control of tracers in oil reservours and commercial monitoring of underground waters.

Obtained results. We have developed sensitive optical membranes on the base of transparent polymethacrylate matrix (PMM) with immobilized reagents for determination of various tracers in oil-water emulsions. The using PMM allowed us to combine the capability of the solid phase to immobilize reagents without losing the matrix transparence and the capability of the reagents to participate in the analytical reaction with analytes accompanied by an optical effect.

PMM is the special created material containing functional groups which provide ability to extract both the reagent and determined substance (analyte) from solutions. Its synthesis carried out to a basis of the methacrylic monomers by radical block polymerization. The material was formed as plates with thickness of 0,5 mm then cut on layers of 6´8 mm size. Immobilization of analytical reagents into a polymeric matrix has been carried out in a static mode within 1-5 min. PMM does not influence upon spectroscopic and analytical properties of reagents. Spectra of absorption of immobilized reagents and products of analytical reaction in PMM after contact to determined substance coincide both in the solution and in the matrix. The contact time of proposed optical sensitive membranes with analyte composes 5 – 30 min. The proposed sensitive optical membranes can be used for the determination of various tracers by solid-phase spectrophotometry, as a ready-made analytical form for visual test determination and digital color analysis/
 

Perspective. The development new special miniature spectrophotometric device for determination of various substances with the use of sensitive optical membranes on the base of transparent polymethacrylate matrix.