Ultrasound-assisted extraction and quantitation of oils from Syzygium aromaticum flower bud (clove) with supercritical carbon dioxide

Determination of Oleanolic and Ursolic Acids inHedyotis diffusaUsing Hyphenated Ultrasound-Assisted Supercritical Carbon Dioxide Extraction and Chromatography

“…Moreover, the small particle size was implicated in the readsorption of extracted solutes onto the matrix surface, which may also be responsible for the effect of the particle sizes on the yield of OA and UA. Similar variations were also obtained during the UAE of antioxidants from pomegranate marc [ 26 ] and during the ultrasound-assisted SC–CO 2 extraction of oils from Syzygium aromaticum flower buds (clove) [ 14 ]. Therefore, the best mean particle size was 0.355 mm, which was adopted for the subsequent experiments.…”

“…SC–CO 2 is pushed beyond its critical point (7.38 MPa and 31.1°C) and has been recognized as an ideal extraction solvent. The most important advantages of this novel extraction method include the safe extraction of thermally labile compounds, shortened extraction times, the tunable selectivity, and solvent removal from the extracted materials [ 13 , 14 ]. The extraction of OA and UA from various raw materials using SC–CO 2 had been studied by Domingues et al [ 15 ], Patinha et al [ 16 ], and Yang et al [ 10 ].…”

“…Therefore, the use of combinatory and hyphenated SC–CO 2 with other techniques can achieve good extraction efficiency with required selectivity in the same or shorter duration using milder conditions than that of solely SC–CO 2 extraction. Recently, several studies investigating the combination application of SC–CO 2 extraction and ultrasound-assisted extraction of target compounds from raw matrices have been published [ 14 ]. In this study, a hyphenated process (HSC–CO 2 ) consisting of ultrasound-assisted static stage, followed by SC–CO 2 dynamic extraction (without ultrasound), was used for the simultaneous separation of OA and UA from H. diffusa .…”

Ethanol solution-modified supercritical carbon dioxide extraction of triterpenic acids from Hedyotis corymbosa with ultrasound assistance and determination of their solubilities

“…Additional details about the equipment and its operation were provided in a previous work [26], and the experimental procedure used was as follows.…”

Production of oridonin‐rich extracts from Rabdosia rubescens using hyphenated ultrasound‐assisted supercritical carbon dioxide extraction

“…Thus, this may result in decreased extraction kinetics of SC‐CO 2 . Recent research has shown that the simultaneous application of SC‐CO 2 and ultrasound was demonstrably faster and resulted in more efficient and more selective extractions of bioactive compounds from various raw materials compared to conventional or reference methods . These enhancements might be due to the cavitational effects that intensified the mass transfer and thus closed the interaction between the SC‐CO 2 and the plant tissues.…”