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• W4224933358 abstract "In this work, the co-precipitation of ethanol extract from grape residue with a biodegradable and biocompatible polymer, polyvinylpyrrolidone, was studied using sub- and supercritical carbon dioxide (CO 2 ) technology, namely in the present work by pressurized anti-solvent (PAS). A full design was used to evaluate the effect of pressure (90, 130 and 170 bar) and temperature (20, 32 and 45 ºC) on the PAS process and the characteristics of the particles formed by it. The particles obtained from the best PAS conditions were submitted to in vitro release studies. Higher pressures and temperatures (CO 2 in supercritical state) significantly resulted in operational conditions with better global precipitation yields and in the production of particles with a lower average diameter and residual ethanol content. The particles had a quasi-spherical shape connected to each other with sizes ranging from 1.3 to 4.1 µm. The interaction of low temperature with high pressure (CO 2 in subcritical state) led to the production of dry powders more concentrated in anthocyanins and total phenolic compounds, and in processes with higher co-precipitation yields of these bioactives. From the in vitro release tests, it was observed that the microparticles released more slowly anthocyanins in simulated gastrointestinal fluids than the precipitated extract without polymer. In the end, it can be concluded that the PAS technique is a very promising process for co-precipitating and concentrating sensitive polar compounds present in crude plant extracts, and produce bioactive microparticles with interesting physicochemical characteristics. Furthermore, it leads to the production bioactive delivery systems with better dissolution rates in simulated gastrointestinal fluids, thus showing potential to be applied in areas that work in favor of health and human well-being. • UAE from grape residue produced an ethanolic extract rich in phenolics. • PAS process was efficient to co-precipitate the extract with PVP. • Temperature and pressure had notable effects on the formation of microparticles. • Bioactive content, precipitation yields and antioxidant capacity were measured. • PAS process was selective in the co-precipitation of polar anthocyanins." @default.
• W4224933358 created "2022-04-28" @default.
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• W4224933358 date "2022-07-01" @default.
• W4224933358 modified "2023-10-18" @default.
• W4224933358 title "Co-precipitation of grape residue extract using sub- and supercritical CO2 technology" @default.
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• W4224933358 doi "https://doi.org/10.1016/j.jcou.2022.102010" @default.
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