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Item type:Publication, Access status: without files , A green/sustainable organocatalytic pathway for the preparation of esterified supercritical CO2-dried potato starch productsProduction 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.Publicationtype: Journal Article34