Extracts from pitanga (Eugenia uniflora L.) leaves: Influence of extraction process on antioxidant properties and yield of phenolic compounds

Supercritical CO2 Extracts and Volatile Oil of Basil (Ocimum basilicum L.) Comparison with Conventional Methods

“…These results can be explained by the compounds responsible for the antioxidant activity not necessarily being the same for each extraction method, since the extracts are complex mixtures of compounds, thus, different interactions, either synergistic or antagonistic, may occur [58]. The antioxidant activity values were greater when compared with other extracts in the literature [3,50,57], which can be explained by the environmental conditions where basil is produced, as well as their genotype.…”

Extracts from mango peel by-product obtained by supercritical CO2 and pressurized solvent processes

“…The second extraction step (PE) showed a higher yield than the first step (ScCO 2 ), due to the use of an polar solvent which allows the extraction of the main polar components of the sample and high extraction yields (Martinez-Correa et al, 2011). The use of organic solvents at high pressures can favor mass transfer of the solutes to the solvent, due to an increase in the interaction between the solvent and the matrix, as well as the solvent power thus improving extraction yields (Luthria, 2012;Mustafa & Turner, 2011).…”

“…When the supercritical extraction is conducted in a sequential manner by extraction with organic solvents, extracts with greater antioxidant activity may be produced and a higher efficiency in the yield of compounds in the biological matrix is generated due to the affinity of the solvents with the desire analites (Martinez-Correa et al, 2011).…”

Extraction of Campomanesia xanthocarpa fruit using supercritical CO2 and bioactivity assessments

“…Regarding DPPH method, an opposite behavior was observed. It should be emphasized, as yet mentioned in literature [45], that the antioxidant compounds detected in each of those methods are not necessarily the same ones, since the extracts are mixtures of compound which can have either antagonistic or synergist interactions.…”

“…For examples, extracts obtained using scCO 2 from C. verbenacea DC, studied by Michielin et al [44], presented TPC values from 46 to 112 mg GAE/g of extract, and for pitanga (Eugenia uniflora L.) leave extracts obtained by Martinez-Correa et al [45] the TPC was 51 mg GAE/g of extract for extraction at 333.15 K and 40 MPa. The TPC value is a useful tool as indicative of extract quality, because they constitute an important group with antioxidant activity, due to their property of scavenging free radicals [44,46].…”