Development and characterization of starch nanoparticles by gamma radiation: Potential application as starch matrix filler

•Gamma radiation is an effective technique for obtain starch nanoparticles (SNP).•Nanoparticles of 20 and 30nm can be obtain from cassava and waxy starch, respectively.•Addition of 2.5wt.% waxy SNP leads to increases of 102% in cassava storage modulus. Gamma radiation arises as an advantageous alternative to obtain starch nanoparticles given its low cost, simple methodology and scalability. Starch nanoparticles (SNP) with sizes around 20 and 30nm were obtained applying a dose of 20kGy from cassava (CNP-γ) and waxy maize (WNP-γ) starch, respectively. They showed the same thermal degradation behavior and their maximum mass loss zone was similar to those nanoparticles obtained from acid hydrolysis (WNP-h). Additionally, CNP-γ and WNP-γ were used as nanofillers in a cassava matrix. Increments of 102% in storage modulus were obtained with the addition of only 2.5wt.% of WNP-γ, showing that gamma radiation is a successful methodology to obtain SNP able to be used as starch reinforcement.