A novel optical sensor based on TiO2 nanoparticles for Valine (one of the twenty standard amino acids within proteins) detection has been developed. In the presented work, commercial TiO2 nanoparticles (Sigma Aldrich, particle size 32 nm) were used as sensor templates. The sensitive layer was formed by a porphyrin coating on a TiO2 nanostructured surface. As a result, an amorphous layer between the TiO2 nanostructure and porphyrin was formed. Photoluminescence (PL) spectra were measured in the range of 370 - 900 nm before and after porphyrin application. Porphyrin adsorption led to a decrease of the main TiO2 peak at 510 nm and the emergence of an additional peak of high intensity at 700 nm. Absorption spectra (optical density vs. wavelenght, measured from 300 to 800 nm) also showed great changes; absorption edge shift and additional peaks appearing. Adsorption of amino acid resulted in a decrease of the intensity of the PL peak due to porphyrin and an increase of intensity of the TiO2 main PL peak. The interaction between the sensor surface and the amino acid leads to the formation of new complexes on the surface and results in a reduction of the optical activity of porphyrin. Sensitivity of the sensor with respect to different concentrations of Valine was calculated. The developed sensor can determine the consentration of Valine in the range of 0,04 to 0,16 mg/ml.

• Терещенко Андрій Олександрович (фізико-математичні науки)
• Терещенко Олександр Григорович (1964–) (фізико-математичні науки)

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