Nükleotid Saflaştırılması İçin Baskılanmış Manyetik Poli(Hidroksietil Metakrilat) (Mphema) Nanoküreler

Abstract

Nucleotides and nucleosides participate in other metabolic functions because they are part of the biosynthetic pathways and play an important role as biological regulators. Nucleotides in various forms play an important role in cell growth and energy metabolism, genetic transmission and signal transduction. The nucleotides serve as either nucleoside 5p-phosphates or as metabolic signaling molecules in the form of modified nucleotides such as 3p, 5'-cyclic adenosine monophosphate (AMP), guanosine tetraphosphate (ppGpp) and 3p, 5'-cyclic diGMP. There are different studies in the literature on the preparation of synthetic receptors for each of the nucleotides. However, the process of designing artificial receptors is often complex and difficult. As an alternative to these methods, the molecular suppression technique allows the preparation of fast, simple and selective polymeric receptors. MIPs are synthetic polymeric materials with specific molecular recognition capabilities that provide high selectivity to selected target molecules. In this thesis, a review of the role of nanotechnology in nucleotide purification is presented. Magnetic 2-hydroxyethyl methacrylate (mPHEMA) nanospheres were synthesized by miniemulsion polymerization method in the presence of Fe3O4 (magnetite) for cytidine purification using molecular suppression method. N-methacryloyl-(L)-histidine methyl ester (MAH) was selected as the functional monomer in the preparation of Cyt-imprinted nanospheres (MIP). MAH and Cu(II) prepared by providing coordination between the complex formation MAH-Cu(II) complex to pre-complex by adding Cyt target molecule is prepared. The unpressured (NIP) mPHEMA without the target molecule was prepared by the same method. Characterization studies of prepared nanospheres were performed by using; Nono Zeta Sizer for size analysis, Brunauer Emmet Teller (BET) method for surafce area measurement, Fourier Transform Infrared Spectroscopy (FTIR) for structural analysis of polymers, scanning electron microscopy (SEM) dor surface morphology and electron spin resonance (ESR) spectroscopy for determination of magnetic properties of polymeric structures.

After characterization studies, initial concentration, pH, temperature, time dependent change and ionic strength parameters of Cyt nucleotide suppressed nanospheres were investigated to determine the maximum adsorption conditions in aqueous solutions. Selectivity experiments with uridine (Uri) and thymidine (Tym) competitor nucleotides were performed to determine the selectivity of Cyt-imprinted nanospheres. In order to determine the reusability of Cyt-imprinted nanospheres, the adsorption-desorption process was repeated 10 times using the same nanospheres.

As a result, in this study, Cyt imprinted magnetic nanospheres synthesized by combining metal coordination and molecular imprinting technique have been successfully synthesized as a highly effective material for high selectivity recognition of Cyt.