Ultrasonic-assisted extraction of epimedin C from fresh leaves of Epimedium and extraction mechanism

Kinetic and characterization studies for three bioactive compounds extracted from Rabdosia rubescens using ultrasound

“…This duration was used as a constant parameter for all further experiments. A similar result was observed during the ultrasonic-assisted extraction of epimedin C from fresh Epimedium leaves (Zhang et al, 2009). Moreover, the extraction rate for a target compound was reportedly (Boonkird et al, 2008;Xia et al, 2012) high at the beginning of the procedure (first 2.5, 5, 10, 15 min) due to the large component concentration gradient between the solvent and raw material.…”

“…Various parameters might affect the extraction yield and efficiency. The particle size and liquid/solid ratio were previously considered important factors in UAE because they can significantly influence the extraction efficiency (Khan et al, 2010;Sun et al, 2010;Zhang et al, 2009). In the present study, the HUAE of the selected compounds from R. rubescens was conducted using various ethanol concentrations, numbers of duty cycles, extraction times and temperatures to determine the conditions that provide the highest target compound yield.…”

“…Zhang et al, 2009;Ma et al, 2008) because it largely Duty cycle (%) Duty cycle dependence for the OA, UA and oridonin extraction yields at 0.355 mm mean particle size, 12 mL/g liquid/solid ratio, 70-80% ethanol concentration, 55 • C, 5 min HRE period and 20 min UAE period.…”

Optimization of ultrasound-assisted extraction of melanin from Auricularia auricula fruit bodies

“…In recent studies on extracting the valuable compounds from plant materials, ultrasound-assisted extraction (UAE) technology has been used (Chua et al, 2009;Rodrigues, Pinto, & Fernandes, 2008;Wang, Sun, Cao, Tian, & Li, 2008;Zhang, Yang, Zhao, & Wang, 2009; and has been proved to a desirable method of extraction with many advantages, such as increasing extraction yield, reducing solvent usage, economizing power consumption and shortening extraction duration. The increase in extraction efficiency by ultrasound is attributed to the propagation of ultrasound pressure waves, and resulting cavitation phenomena (Vilkhu, Mawson, Simons, & Bates, 2008).…”

A method of detecting carbonyl compounds in tree leaves in China

“…Compared with other extraction techniques such as microwave-assisted extraction, the ultrasonic device is cheaper and its operation is much easier (Chen et al 2008;Wang and Weller 2006). Zhang et al (2009) demonstrated that ultrasonication extraction can shorten extraction time, reduce extraction temperature, and decrease solvent consumption. To date, ultrasonication extraction has been applied for fresh plant materials including fresh roots, fresh leaves, and fresh fruits (Wu et al 2001;Li et al 2005;Zhang and Liu 2008).…”