A green/sustainable organocatalytic pathway for the preparation of esterified supercritical CO2-dried potato starch products

Production of renewable and modified starch-based products was achievedusing a sustainable catalyst and an environmentally friendly drying process viasupercritical CO2. Potato starch was modified via a sustainable and green ester-ification process with acetic anhydride reagent implementing a novel organo-catalytic pathway at different periods of time (0.5, 3 and 7 h) by applying anesterification reaction at 120°C targeting intermediate degrees of substitution(i.e., 0.2 < DS <1.5) finding potential applications as polymer packaging mate-rials. The final modified samples were divided into two fractions, where the firstfraction was dried under vacuum at 80°C for 24 h and the second fraction wasdried under supercritical CO2at 40°C and 100 bars for 2 h. The final productswere analyzed using an array of characterization techniques such as Fouriertransform infrared (FTIR), Proton nuclear magnetic resonance (1H-NMR), scan-ning electron microscopy (SEM), X-ray diffraction (XRD), N2physisorption,thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), andKarl Fischer. The chemical structure of both fractions was similar as confirmedby the different characterization techniques. Drying under supercritical CO2pre-served some pores in the modified starch materials as opposed to thermal ovendrying, as was confirmed by N2physisorption measurements. The degree of sub-stitution (DS) was determined using three different techniques; titration, highperformance liquid chromatography (HPLC) and solution state proton nuclearmagnetic resonance (1H NMR) spectroscopy and the values were greater than 0.2 and less than 1.5 indicating intermediate degrees of substitution.

DDC Class

620: Ingenieurwissenschaften

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A green/sustainable organocatalytic pathway for the preparation of esterified supercritical CO2-dried potato starch products