Table 3.
Extraction techniques and main results reported in literature for the recovery of phenolic compounds from pink savory.
| Solvent | Method | Measured Parameters | Main Results | Reference |
|---|---|---|---|---|
| Ethyl acetate Ethanol (solid/liquid 1/10, w/v) | Soxhlet successive extraction (6–8 h, until the extract was colorless) Pretreatment: water-steam EO distillation |
TPC DPPH Antioxidant activity in palm oil and oil-in-water emulsions |
The TPC content followed the order ethanol extract > aqueous extract from EO distillation > ethyl acetate extract. Ethanol and aqueous extracts exhibited good antiradical activity, ethyl acetate a moderate one. Ethyl acetate extract showed antioxidant activity in palm oil, and ethanol extract in emulsions. |
[101] |
| Aqueous solution of potassium hydroxide (KOH), 1%, 3%, and 5% (w/v) | Maceration with stirring (room temperature, 0.5, 3, 6, and 24 h) Pretreatment: water-steam EO distillation |
TPC DPPH Oxidative stability index |
High TPC and good antiradical and antioxidant activity of the extracts in 30 min of extraction with KOH 1% (w/v). The increase of extraction time and KOH concentration caused lower TPC, antioxidant, and DPPH radical scavenging ability of the extracts. |
[2] |
| Methanol in water 70% of Water |
UAE (bath, less than 30 °C, 20 min) | HPLC DPPH FRAP ABTS TPC |
A reversed phase HPLC method has been developed for the determination of 24 phenolic compounds in five aromatic plants of the Lamiaceae family. Methanol 70% was more effective than water. | [79] |
| Methanol (solid/liquid 1/33.3, w/v) | Heat reflux extraction (water bath, 1 h) | HPLC | Isolation, qualification, and quantification of free phenolic acids in plant material. Removal of interfering compounds (chlorophyll, waxes, and polyphenols) by means of a solid phase extraction clean-up on an octadecyl sorbent and anion exchange resin. |
[105] |
| Glycerol-based ionic liquids | Maceration with stirring (600 rpm), at 50 °C for 200 min | HPLC TPC DPPH FRAP |
Optimum water concentration 54.8–63.8% (v/v) and s/l 1/30–1/36, w/v. LTTMs displayed anti-Arrhenius kinetics over a temperature ranging from 40 to 80 °C, evidencing peculiar extraction behavior. |
[106] |
ABTS: 2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid radical, DPPH: 1,1-diphenyl-2-picrylhydrazyl radical, EO: essential oil, FRAP: ferric reducing antioxidant power, TPC: total phenolic content, UAE: ultrasound assisted extraction.