Simple models for supercritical extraction of natural matter

Pardo-Castaño, Camilo; Velásquez, Manuel; Bolaños, Gustavo

doi:10.1016/j.supflu.2014.09.044

Cited by 25 publications

(12 citation statements)

References 14 publications

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“…The chemical profile of the extracts obtained showed high levels of spathulenol, especially for SFE. The simple mathematical model proposed by Pardo-Castaño et al (2015) satisfactorily correlated the experimental data with the calculated values.…”

Section: Resultsmentioning

confidence: 63%

“…A model described by Pardo-Castaño et al (2015) was used to correlate the experimental values of the supercritical extraction. The model is based on the absorption theory of Brunauer-Emmett-Teller and it expresses the extraction yield (Y) as a function of time (t) with three parameters; y * , extract solubility in the SFE, K, the relationship between the solute adsorption equilibrium constant of the first monolayer and the subsequent layers and x m , the ratio of the mass of solute present in the first monolayer and the initial mass of solute, that can be derived according to Eq.…”

Section: Modeling Of the Experimental Datamentioning

confidence: 99%

“…(14) Table 3 shows the values of the parameters y * , K and x m adjusted to the experimental values. According to Pardo-Castaño et al (2015), a single value of x m encompasses all the experimental conditions studied due to its weak dependence on these conditions. This occurs because this property is dependent on the solidsolute interaction.…”

Section: Extraction Yieldmentioning

confidence: 99%

“…Fig. 2 shows the correlation of experimental values and the adjusted model according to Pardo-Castaño et al (2015). of relative area, respectively.…”

Section: Extraction Yieldmentioning

confidence: 99%

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EXTRACTION OF BIOACTIVE COMPOUNDS OF LEAVES OF Duguetia furfuracea (ANNONACEAE) USING GREEN AND ORGANIC SOLVENTS

Favareto

Teixeira

Soares

et al. 2019

Braz. J. Chem. Eng.

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Duguetia furfuracea (Annonaceae) is a shrub found in the Brazilian Cerrado that is used in popular medicine as an antirheumatic, for wound healing, treatment of kidney pain and against pediculosis. The aim of this study was to analyze the extraction of leaves of Duguetia furfuracea, using supercritical CO 2 , ethanol and hexane as solvents. For the supercritical extraction, an experimental planning 2 3 with triplicates of the central point was used to evaluate the effects of temperature (313-333 K), pressure (15-23 MPa) and volumetric flow rate (3-6 mL min -1 ) on the extraction yield, total phenolic content and antioxidant activity compared with extracts obtained by Soxhlet extraction. The effects of the variables on the extraction yield were positive and the pressure had greater influence. However, the highest performances, total phenolic content and antioxidant activities were obtained by the Soxhlet method. The mathematical model based on the Brunauer-Emmett-Teller theory of adsorption correlated satisfactorily the experimental values of the supercritical extraction.

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Section: Resultsmentioning

confidence: 63%

Section: Modeling Of the Experimental Datamentioning

confidence: 99%

Section: Extraction Yieldmentioning

confidence: 99%

“…Fig. 2 shows the correlation of experimental values and the adjusted model according to Pardo-Castaño et al (2015). of relative area, respectively.…”

Section: Extraction Yieldmentioning

confidence: 99%

See 2 more Smart Citations

EXTRACTION OF BIOACTIVE COMPOUNDS OF LEAVES OF Duguetia furfuracea (ANNONACEAE) USING GREEN AND ORGANIC SOLVENTS

Favareto

Teixeira

Soares

et al. 2019

Braz. J. Chem. Eng.

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“…Supercritical fluids are able to penetrate any solid matrix due to changes in their physicochemical characteristics under these conditions. Therefore, during the supercritical stage, the fluids present the peculiarities of a gas but also of a liquid [23][24][25]. This permits increased solubility and improves the extraction of compounds such as polyphenols, fatty acids, and alkaloids, among others that have previously been studied [21,23,25,26].…”

Section: Introductionmentioning

confidence: 99%

Supercritical Fluid Extraction of Fat and Caffeine with Theobromine Retention in the Cocoa Shell

et al. 2019

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The cocoa shell is a residue of low commercial value, which represents an alternative for obtaining substances of added value for the food and pharmaceutical industry. Substances of interest in the shell include fat and methylxanthines (theobromine and caffeine). In order to obtain the extraction behavior with supercritical CO2, a 23 factorial design was proposed with six central points, taking dynamic extraction into consideration. The following factors were involved: pressure (2,000–6,000 psi), temperature (313–333 K), and time (30–90 min). The obtained yield was between 3.66% and 15.30%. Fat was the substance that was extracted most effectively (94.73%). Caffeine demonstrated variability in the residue, with at least six treatments that exceeded a removal rate of more than 90%, while it was practically impossible to extract theobromine. The difference with regard to the extraction of theobromine may be attributed to its low solubility. Characterization using FT–IR showed the modifications before and after the process, providing clear evidence of the changes corresponding to the fat at 2,924, 2,854 and 1,745 cm−1. The results presented establish the basis for the extraction of substances such as fats and methylxanthines from a cocoa shell with the use of CO2.

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High pressure extraction of olive leaves (Olea europaea): bioactive compounds, bioactivity and kinetic modelling

et al. 2019

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In this study, the extraction yield, the mathematical modeling of pressurized liquid extraction (PLE) kinetics with sub-and supercritical carbon dioxide (SC-CO 2 ) of olive leaves (Olea europaea) and the biological activity of the extracts were evaluated. The extraction with PLE was conducted isobarically (10.3 MPa), varying the temperature (20, 40 and 60 °C) and the solvent (ethyl acetate, acetone, ethanol, ethanol:water-80:20, v:v), solvent flow (2 mL min -1 ) and time (110 min) and the extractions with SC-CO 2 , varying the temperature between 20 and 60 °C and the pressure between 8 and 25 MPa, keeping the time constant (210 min) and the CO 2 flow of 2 mL min -1 . In the extracts, antioxidant activity, total phenolic and flavonoid contents and oleuropein were evaluated. The highest total extract yield in the PLE was 30.91% at 60 °C, 10.3 MPa using ethanol:water (80:20, v:v). The yield obtained using the supercritical fluid was 0.68% at 60 °C and 25 MPa. The PLE extract obtained with ethanol at 60 °C presented the highest concentration of total phenolic content (386.42 mg GAE g -1 extract), total flavonoids content (33.43 mg CAT g -1 extract), oleuropein (73.65 mg g -1 extract) and antioxidant activity (82.87%). The overall extraction curves were modeled using the well-established Sovova ´model and kinetic extraction model based on the Brunauer-Emmett-Teller theory of adsorption. Both kinetic models used were able to correlate well with the experimental data with slightly better results obtained by the former. The alternative PLE extraction technique investigated in this work was found to be suitable for the extraction of olive leaves after short times of extraction obtaining an extract with high biological activities.

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Simple models for supercritical extraction of natural matter

Cited by 25 publications

References 14 publications

EXTRACTION OF BIOACTIVE COMPOUNDS OF LEAVES OF Duguetia furfuracea (ANNONACEAE) USING GREEN AND ORGANIC SOLVENTS

EXTRACTION OF BIOACTIVE COMPOUNDS OF LEAVES OF Duguetia furfuracea (ANNONACEAE) USING GREEN AND ORGANIC SOLVENTS

Supercritical Fluid Extraction of Fat and Caffeine with Theobromine Retention in the Cocoa Shell

High pressure extraction of olive leaves (Olea europaea): bioactive compounds, bioactivity and kinetic modelling

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