The experiments were focused on two directions: immobilisation of invertase on new supports based on chitosan and hyaluronic acid ionically cross-linked and on magnetic nanoparticles covered with various polymers.

Biopolymeric films were obtained by mixing different ratios of 2% (w/v) chitosan and 1% (w/v) hyaluronate solutions. Chitosan/hyaluronic acid films were cross-linked with sodium citrate by soaking chitosan/hyaluronic acid films into a sodium citrate solutions (2.5, 5%, w/v). Immobilisation of the enzime on the film surface was made through immersion. The ultrastructure of carried out films (chitosan, chitosan/hyaluronic acid and invertase immobilised on chitosan/hyaluronic acid film) were exmined using Confocal Scanning Laser Microscopy.

Magnetic nanoparticles were synthetized by thermal co-precipitation of ferric and ferrous chloride. In order to improve biocompatibility, magnetic carriers were encapsulated using polyvinyl alcohol, polyethylene glycol, polyvinyl acetate and polyacrilic acid as sheel materials. Enzyme was immobilized on the functionalized surface. Transmision Electron Microscopy and Scanning Electron Microscopy were used to characterize the particles, having a size between 18 nm and 580 nm. Fourier Transformed Infrared Spectroscopy was used to confirm the structure of functionalized particles and also the enzyme binding, via monitoring the changes in shape, intensity and wavelength shift (1715.5 - 1732 cm^-1) of the - COOH group of polymers.

The study indicates that the stability and activity of enzyme were enhanced via magnetic nanoparticles and films binding.

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/4393 must be provided.

1. Studies of New Procedures for Sensors and Biosensors Development Based on Modified Gold and Platinum Supports