Ultrasound assisted supercritical fluid extraction of oil and coixenolide from adlay seed

Abstract

Oil and coixenolide are important components of adlay seed (Coix lachrymal-jobi L. var. Adlay) with many beneficial functions to human health. In this work, a novel extraction technique--ultrasound assisted supercritical fluid extraction (USFE)--was studied. Effects of operating conditions on the extraction, including extraction temperature (T), pressure (P), time (t), CO(2) flow rate (F) and ultrasonic power (I) were investigated. There are optimum temperatures which gives the maximum extraction yields (EYs) for the supercritical fluid extractions with and without ultrasound. The effect of pressure on EYs for is similar to that of pressure on CO(2) density. Based on the yield of extraction, the favorable conditions for supercritical fluid extraction (SFE) were: T at 45 degrees C, P at 25 MPa, t at 4.0 h and F at 3.5L/h. While ultrasound was applied as in USFE, the following parameters were preferred: T at 40 degrees C, P at 20 MPa, t at 3.5h and F at 3.0 L/h, respectively. The results show that supercritical fluid extraction with the assistance of ultrasound could reduce the temperature, pressure, CO(2) flow rate, as well as time used in the process. Compared with SFE, USFE could give a 14% increase in the yield for extracting oil and coixenolide from adlay seed with less severe operating conditions.

Comparison of Conventional and Ultrasound Assisted Supercritical Carbon Dioxide Extraction of Curcumin from Turmeric (Curcuma longa L.)

“…In this case, it facilitates the solvent penetrate in material and improve the mass transfer, thus increasing the extraction rate and yield [11]. Recently, ultrasound assisted supercritical fluid extraction has been applied to extract functional compounds from different raw materials such as blackberry bagasse [10], malagueta paper [11], adlay seed [12], Scutellaria barbata D. Don [13], grape marc [14], cumbaru almond [15], and, clove [16]. However, no reports have been found in the literatures that consider the Ultrasound assisted supercritical carbon dioxide (USC-CO2) extraction of curcumin from turmeric.…”

Soluble starch–based biodegradable and microporous microspheres as potential adsorbent for stabilization and controlled release of coix seed oil

“…It is well known that CSO possesses diverse antitumor activities and has been widely applied to treat multiple primary malignant tumors [2,3]. Furthermore, CSO has various exceptional properties of enhancing the immunocompetence and effect of natural killer cells on tumor cells [4], and help prevent the decrease in white blood cells during chemical therapy [5,6]. However, it also has some drawbacks, involving biological instability, poor water-solubility, low adsorption capacity, and short biological half time in body, which restrict the utilization of CSO in food and pharmaceutical industries.…”

Contribución al estudio de la aplicación de ultrasonidos de potencia en el secado convectivo de alimentos

“…Las principales aplicaciones de los ultrasonidos de potencia en medios líquidos se encuentran en el salado de carne (Cárcel, 2003) y queso (Sánchez et al, 2000), la deshidratación osmótica de frutas (Taiwo et al, 2003) y también en procesos de extracción de productos naturales tanto con disolventes convencionales (Romdhame y Gourdon, 2002;Albu et al, 2004;Stavarache et al, 2006) como con fluidos supercríticos (Riera et al, 2004;Balachandran et al, 2006;Hu et al, 2006;Cho et al, 2006). A partir del estudio de dichos trabajos se han podido identificar algunas de las principales variables que influyen en la aplicación de ultrasonidos de potencia: intensidad acústica, frecuencia, temperatura y tipo de material.…”