Ultrasound assisted adsorption and desorption of blueberry anthocyanins using macroporous resins

Abstract

In this study, the impact of ultrasound on the adsorption and desorption features of blueberry anthocyanins on macroporous resins were studied. Sonication was performed at 106-279 W/L and 20-30 °C in a pulsed mode, respectively. Generally, ultrasound treatments within the selected experimental range enhanced the adsorption/desorption process of anthocyanins on macroporous resins. The recovery of blueberry anthocyanins after ultrasound-assisted adsorption/desorption process at 279 W/L and 20 °C was 82.12%, which was 52.84% higher than that obtained after adsorption/desorption with shaking at 100 rpm. Meanwhile, higher acoustic energy density (AED) levels and lower temperatures benefited the adsorption process through enhancing the adsorption capacity and shortening the equilibrium time, whereas higher temperatures promoted the desorption process. Furthermore, malvidin-3-galactoside had the highest adsorption and desorption capacities among all the studied monomeric anthocyanins. No organic acids and sugars were detected after adsorption/desorption processes, indicating the successful improvement of anthocyanin purification. Sonication mainly enhanced the adsorption process by means of strengthening the formation of hydrogen bond on resins surface and increasing their surface roughness. Overall, ultrasound can be an effective tool to improve the purification of anthocyanins using macroporous resins.

Enhanced Kinetic Removal of Ciprofloxacin onto Metal-Organic Frameworks by Sonication, Process Optimization and Metal Leaching Study

“…The formation of micro jets and high-pressure zones during the sonication could promote the migration of CIP molecules into the nano-sized pores of ZIF-67-SO 4 . Similar findings were also obtained for the removal of blueberry anthocyanins [26], congo red [27], phosphate [28], and different dyes [29]. Studies also demonstrated that sonication can be used as a modifier to promote the structural properties of adsorbents to reach higher capacity for target contaminants [30,31].…”

“…As Figure 7 shows, sonication could result in much higher Co ions when compared with conventional mixing. This could be attributed to higher shear forces during sonication which results in de-agglomeration of crystals and the probable break-down in the structure of ZIF-67-SO 4 [26,27].…”

Preparation and Characterization of Porous Carbon@ZnO‐NPs for Organic Compounds Removal: Classical Adsorption Versus Ultrasound Assisted Adsorption

“…Besides, the ultrasonic waves create microscopic turbulence through the solid particles generating final acoustic streaming and break the affinity between adsorbents and adsorbates ,. Moreover, the combination of the two techniques leads to increase the efficiency and also decrease the cost of dye adsorption by reducing the reaction time and adsorption equilibrium ,. In addition to the ultrasound irradiation, the effective adsorption requires the low‐cost adsorbents having high surface areas and multi‐functional groups on their surfaces.…”

Ultrasound Treatment on Stability of Total and Individual Anthocyanin Extraction from Blueberry Pomace: Optimization and Comparison

“…Alternatively, ultrasound, an oscillating sound pressure wave with a frequency over 20 kHz, has been shown to facilitate extraction by increasing the mass transfer between the solvent and the plant material [20]. As a green, non-thermal processing technique, ultrasound has been perceived as a more sustainable, green, and efficient solution for industrial application than conventional approaches, and its use in anthocyanin extraction has already been demonstrated.…”