A green/sustainable organocatalytic pathway for the preparation of esterified supercritical <scp> CO ₂ </scp> ‐dried potato starch products

Production of renewable and modified starch-based products was achieved using a sustainable catalyst an environmentally friendly drying process via supercritical CO2. Potato starch green esterification with acetic anhydride reagent implementing novel organocatalytic pathway at different periods time (0.5, 3 7 h) by applying reaction 120°C targeting intermediate degrees substitution (i.e., 0.2 < DS <1.5) finding potential applications as polymer packaging materials. The final samples were divided into two fractions, where the first fraction dried under vacuum 80° C for 24 h second CO2 40° 100 bars 2 h. analyzed array characterization techniques such Fourier transform infrared (FTIR), Proton nuclear magnetic resonance (1H-NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD), N2 physisorption, thermogravimetric analysis (TGA), differential calorimetry (DSC), Karl Fischer. chemical structure both fractions similar confirmed techniques. Drying preserved some pores in materials opposed to thermal oven drying, physisorption measurements. degree (DS) determined three techniques; titration, high performance liquid chromatography (HPLC) solution state proton (1H NMR) spectroscopy values greater than less 1.5 indicating substitution.