Green Synthesis and Characterization of Amine‐Modified Starch Nanoparticles

Abstract

In this study, amine‐modified starch (AMS) nanoparticles are prepared from native sago starch (Metroxylon sagu) through a facile, economical, and aqueous‐based approach. Dialdehyde starch is initially synthesized by reacting sago starch with sodium periodate and followed by the addition of ethylenediamine for the preparation of AMS. The percentage of amine content and degree of substitution of AMS is determined by back‐titration technique. The degree of substitution of AMS is determined to be within the range of 0.9973 to 0.9984, respectively. Subsequently, AMS nanoparticles with mean particle diameters ranged between 170 and 280 nm are obtained by controlled precipitation through the drop‐wise addition of AMS solution into excess ethanol solution. The mean particle sizes of AMS nanoparticles are observed to be affected by the synthesis parameters including the ratio of solvent and non‐solvent system.

Antibacterial Activity of Carboxymethyl Chitosan Dialdehyde Starch Schiff Base and its Metal Complex

“…2. The major peaks at 3428 cm − 1 , 2932 cm − 1 and 1642 cm − 1 in the spectrum of corn starch were always attributed to the hydroxyl groups, -CH 2 and the amorphous region water respectively, while the distinct peaks at 1738 cm − 1 and 878 cm − 1 of DAS were attributed to C = O and the hemiacetal of DAS [33][34][35], which were conforming with previous works of corn starch and DAS. From the spectrum of CMCDAS, the peaks at 1738 cm − 1 and 878 cm − 1 disappeared, while the peaks at 1629 cm − 1 , 1324 cm − 1 and 1412 cm − 1 appeared which were attributed to the stretching vibration peak of C = N, the out-of-plane bending vibration of O-H and C = O stretching vibration [36].…”

Antibacterial Activity of Dodecylamine Dialdehyde Starch Schiff Base Derivatives

“…The major peaks at 3428, 2932, and 1642 cm −1 were always attributed to -OH (indicating the presence of hydroxyl groups), ─CH 2 , and amorphous region in St adsorption water, respectively. While the distinct peaks at 1738 and 878 cm −1 in the spectrum of DAS were attributed to C = O and the hemiacetal formation of the DAS complex, [14,[17][18][19] conforming with previous work concerning the formation of DAS. From the spectrum of DASDA, the peak at 1738 cm −1 attributed to C = O disappeared, the peak at 1634 cm −1 was attributed to C = N, and both the peaks at 2925 and 2855 cm −1 were attributed to C-H. All those peaks indicated that the DA was successfully introduced into DAS.…”

Influence of Moisture Content on Starch Esterification by Solvent‐Free Method

“…Recently, solvent‐free modification of starch, an easy process, low cost, and avoidance of volatile organic solvents in organic syntheses, has attracted increasing attention. [ 8–12 ] Many published studies are using the solvent‐free method to modify starch. For example, Zuo et al.…”