A system for delivery of analogues of 2′-deoxyribonucleoside triphosphate (dNTP) based on SiO2 nanoparticles was proposed. A simple and versatile method was developed for the preparation of SiO2–dNTP conjugates using the 'click'-reaction between premodified nanoparticles containing the azido groups and dNTP containing the alkyne-modified γ- phosphate group. The substrate properties of SiO2–dNTP were tested using Klenow ...