Antioxidative phenolics obtained from spent coffee grounds (Coffea arabica L.) by subcritical water extraction

Effects of ultrasonication, agitation and stirring extraction techniques on the physicochemical properties, health‐promoting phytochemicals and structure of cold‐brewed coffee

“…Different conventional and non‐conventional extraction methods have been applied to improve the quality attributes in coffee. Non‐conventional extraction methods are gaining popularity among product developers because of a move towards reduction in the consumption of organic solvents, simplified operation, high efficiency of extraction and environmentally friendly systems . Non‐conventional methods also could destroy the cell wall via cavity formation, which might improve coffee's nutritional properties .…”

“…Extraction using boiling water under elevated pressure resulted in the highest concentration of chlorogenic acids in Robusta coffee beans, whereas extraction using boiling water under atmospheric pressure resulted in the highest chlorogenic acid content in Arabica coffee . In addition, subcritical water extraction was applied to obtain antioxidative phenolics from spent coffee grounds . Phytochemicals were extracted from waste spent coffee grounds using an ultrasound‐assisted solid–liquid method, and ultrasound treatment was used to extract caffeine from coffee using ethanol …”

“…5 In addition, subcritical water extraction was applied to obtain antioxidative phenolics from spent coffee grounds. 3 Phytochemicals were extracted from waste spent coffee grounds using an ultrasound-assisted solid-liquid method, 4 and ultrasound treatment was used to extract caffeine from coffee using ethanol. 7 The extraction method could play a vital role in improving the phenolic compound content.…”

Optimization of Subcritical Water Extraction of Resveratrol from Grape Seeds by Response Surface Methodology

“…In Figure 2c, we found that from 110 • C to 150 • C, the yield of RES changed significantly. An increase in temperature favored the extraction of phenolics by enhancing the diffusion coefficient of solvent, solubility of solutes, diffusion rate of analytes, and reducing solvent viscosity and surface tension [26]. At this point, the other conditions were set as follows: solid/solvent ratio, 1:15 g/mL; pressure, 1.0 MPa; and extraction time, 25 min.…”

Subcritical Water Extraction of Phenolic Compounds and Analysis of Inorganic Elements from Erigeron breviscapus

“…It is urgent to develop an alternative, green, efficient way to extract the valuable components from Erigeron breviscapus . Subcritical water which has unique physicochemical properties has been successfully proved to be an excellent medium for extracting polar and nonpolar compounds from plants and food materials . Subcritical water, also known as superheated water, high temperature water, high pressure water or hot liquid water, means that under certain pressure water is heated in the temperature range of 100 °C to 374 °C, and the water body remains in liquid state.…”