Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 36, Issue 2, Pages 1041-1051Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/0104-6632.20190362s20180159
Keywords
Eugenia uniflora L.; Fractionation; Supercritical extraction; Phenolic compounds
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Funding
- FAPESP [12/51317-1, 14/16662-5]
- Espaco da Escrita - Coordenadoria Geral da Universidade - UNICAMP
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [14/16662-5] Funding Source: FAPESP
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Hydroalcoholic extracts prepared by conventional methods (in stirred vessel at 25 degrees C and 1 bar) and, hydroalcoholic and supercritical carbon dioxide (scCO(2)) extracts prepared in fixed bed extractors (60 degrees C and 400 bar) were obtained from pitanga leaves (Eugenia uniflora L.) in order to recover phenolic compounds. Hydroalcoholic and ethanolic extracts obtained in fixed bed were further fractionated in four separators by gradual pressure reduction, using scCO(2) as an antisolvent. All extracts and fractions were characterized in terms of extraction yield and the presence of total phenolics and flavonoids. Solvents were found to significantly influence the extraction yields and composition. Yields increased as a function of polarity, whereas the hydroalcoholic extractions displayed the highest yields and the highest amounts of extracted phenols and flavonoids.
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