This study developed oxidized starch-chitosan complexes for the adsorption of procyanidins . Oxidized starch-chitosan complexes were prepared in two steps. Native cornstarch was first oxidized with a 2,2,6,6-tetramethyl piperidinyloxy (TEMPO) mediated reaction and then surface coated with chitosan to adsorb procyanidins. This study evaluated the morphologies and structures of starches in addition to the adsorption properties of procyanidins onto oxidized starch-chitosan complexes. The zeta potential revealed that the optimal weight ratio of oxidized starch and chitosan in the complexes was 1:0.4. The UV–visible spectrum of the complexes showed absorption spectra at about 255 nm, which has never been observed for oxidized starch. X-ray analysis and SEM indicated that the complexes changed the crystallinity and morphology of native starch. The ATR-FTIR spectra suggested that electrostatic interactions may be present between the -COO - of oxidized starch and –NH 3 + of chitosan. The adsorb experiments suggested that the oxidized starch-chitosan complexes could potentially be applied as carriers of bioactive compounds . This paper provides a good reference for an efficient adsorbent of polyphenols by oxidized starch-chitosan complexes.
Nano-sized CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 with hexagonal phase have been prepared by simply varying the reactant P/Ce molar ratio in bacterial liquid. The phase composition of two samples was checked via Fourier transform infrared spectroscopy (FTIR), energy dispersive analysis of X-rays (EDS) and X-ray diffraction (XRD) analyses, displaying the presence of CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 with average crystallite size are 32.34 and 15.61 nm, respectively. The scanning electron microscopy (SEM) images show that nano-clusters and sphere-like in shape with a narrow diameter distribution were observed in two samples. The transmission electron microscopy (TEM) photographs further indicate obtained CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 nanoparticles correspond to nanosheets and nanorods , respectively. The emission spectra of CePO 4 @NaCe(SO 4 ) 2 (H 2 O) and CePO 4 display a broad band of 300–380 nm range with the strongest emission at 342 nm in the violet region.
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