Magnetic soy protein isolate–bovine serum albumin nanoparticles preparation as a carrier for inulinase immobilisation

Abstract

Magnetic nanoparticles (NPs) were functionalised with soy protein isolate (SPI) and bovine serum albumin (BSA) for inulinase immobilisation. The results revealed the nanomagnetite size of about 50 nm with a polydispersity index (PDI) of 0.242. The average size of the SPI NPs prepared by using acetone was 80-90 nm (PDI, 0.277), and SPI-BSA NPs was 80-90 nm (PDI, 0.233), and their zeta potential was around -34 mV. The mean diameter of fabricated FeO@SPI-BSA NPs was <120 nm (PDI, 0.187). Inulinase was covalently immobilised successfully through glutaraldehyde on FeO@SPI-BSA NPs with 80% enzyme loading. Fourier transform infrared spectra, field emission scanning electron microscopy, and transmission electron microscopy images provided sufficient proof for enzyme immobilisation on the NPs. The immobilised inulinase showed maximal activity at 45°C, which was 5°C higher than the optimum temperature of the free enzyme. Also, the optimum pH of the immobilised enzyme was shifted from 6 to 5.5. Thermal stability of the enzyme was considerably increased to about 43% at 75°C, and value was reduced to 25.4% after immobilisation. The half-life of the enzyme increased about 5.13-fold at 75°C as compared with the free form. Immobilised inulinase retained over 80% of its activity after ten cycles.

Improvement of efficacy and decrement cytotoxicity of oxaliplatin anticancer drug using bovine serum albumin nanoparticles: synthesis, characterisation and release behaviour

“…BSANPs were synthesised by desolvation method [15][16][17]. Size of the nanoparticles can be controlled by various factors such as concentration and pH of the BSA solution, the volume and rate of addition of ethanol, the time and amount of cross-linker, stirring speed, temperature and so on.…”