Effect of the aging temperature on soybean biodiesel oxidation, quantifying the formed gums and sediments by thermogravimetry

Soluble Soybean Polysaccharide/Carrageenan Antibacterial Nanocomposite Films Containing Green Synthesized Silver Nanoparticles

“…The broad band ranging from 3600 to 3000 cm –1 is attributed to the O–H stretching vibration, and the band in the range of 2800–3000 cm –1 is related to the stretching vibration of C–H. The bands at 1742, 1613, and 1028 cm –1 are assigned to CO stretching (ester carbonyl), CO asymmetric stretching, and C–O–C stretching, respectively. , The spectra of the SSPS-based film did not show an obvious change after the addition of CG because SSPS and CG share the main structural characteristics and functional groups of polysaccharides. Nevertheless, the spectrum of the SSPS/CG blend film shows an increase in the intensity of the bands at 1228 cm –1 (sulfate ester vibration), 843 cm –1 (galactose-4-sulfate vibration), and 696 cm –1 (sulfate on C-4 of galactose vibration), indicating the presence of CG in the film composition. , The C–O stretching band of the C–O–H group shifted from 1152 cm –1 (SSPS) to 1157 cm –1 (SSPS/CG), possibly due to the intramolecular hydrogen bonding between SSPS and CG.…”

“…The bands at 1742, 1613, and 1028 cm −1 are assigned to C�O stretching (ester carbonyl), C�O asymmetric stretching, and C−O−C stretching, respectively. 37,38 The spectra of the SSPS-based film did not show an obvious change after the addition of CG because SSPS and CG share the main structural characteristics and functional groups of polysaccharides. Nevertheless, the spectrum of the SSPS/CG blend film shows an increase in the intensity of the bands at 1228 cm −1 (sulfate ester vibration), 843 cm −1 (galactose-4-sulfate vibration), and 696 cm −1 (sulfate on C-4 of galactose vibration), indicating the presence of CG in the film composition.…”