Preparation and characterization of starch nanoparticles through ultrasonic-assisted oxidation methods.
In this work, starch nanoparticles (SNPs) were prepared from waxy corn starch (WCS) through ultrasonic-assisted oxidation. Three SNPs samples were produced by one time oxidation followed by ultrasonic treatment (O1U1-SNPs), twice oxidation and twice ultrasonic treatment (O2U2-SNPs) and TEMPO-mediated oxidation with ultrasonic treatment (TEMPO-SNPs), respectively. Differential scanning calorimetry (DSC), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to characterize the thermal properties, morphology, and structure of the ensuing nanoparticles. The results revealed that the size of the O1U1-SNPs, O2U2-SNPs, and TEMPO-SNPs particles reached 30-50 nm, 20-50 nm and 20-60 nm, respectively. Compared to WCS, the crystallinity of the O1U1-SNPs, O2U2-SNPs and TEMPO-SNPs samples decreased from 36.32% to 11.35%, 1.64% and 1.72%, respectively. The O1U1-SNPs, O2U2-SNPs and TEMPO-SNPs exhibited smaller or no endotherms. The SNPs had higher carboxyl and carbonyl content.
School of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China. Electronic address: phdsun@163.com.
Qingjie
Q
Sun
School of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China.
Haoran
H
Fan
School of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong Province 266109, China.
Liu
L
Xiong
D002152:Calorimetry, Differential Scanning; D003497:Cyclic N-Oxides / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D013010:Sonication / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry*; D014961:X-Ray Diffraction; D003313:Zea mays / Q000737:chemistry
D003497:Cyclic N-Oxides; D013213:Starch; C003959:TEMPO
Nanoparticles; Oxidation; Starch; Ultrasonication