Impact of ultrasound on solid–liquid extraction of phenolic compounds from maritime pine sawdust waste. Kinetics, optimization and large scale experiments

Abstract

Maritime pine sawdust, a by-product from industry of wood transformation, has been investigated as a potential source of polyphenols which were extracted by ultrasound-assisted maceration (UAM). UAM was optimized for enhancing extraction efficiency of polyphenols and reducing time-consuming. In a first time, a preliminary study was carried out to optimize the solid/liquid ratio (6g of dry material per mL) and the particle size (0.26 cm(2)) by conventional maceration (CVM). Under these conditions, the optimum conditions for polyphenols extraction by UAM, obtained by response surface methodology, were 0.67 W/cm(2) for the ultrasonic intensity (UI), 40°C for the processing temperature (T) and 43 min for the sonication time (t). UAM was compared with CVM, the results showed that the quantity of polyphenols was improved by 40% (342.4 and 233.5mg of catechin equivalent per 100g of dry basis, respectively for UAM and CVM). A multistage cross-current extraction procedure allowed evaluating the real impact of UAM on the solid-liquid extraction enhancement. The potential industrialization of this procedure was implemented through a transition from a lab sonicated reactor (3 L) to a large scale one with 30 L volume.

Ultrasonic‐assisted extraction of betalains from red beet (Beta vulgaris L.)

“…Based on Table , the contents of betacyanins and betaxanthins obtained from UAE were higher ( p < .05) than those obtained by conventional extraction methods (orbital shaker and metabolic shaker). According to Corbin et al () and Meullemiestre, Petitcolas, Maache‐Rezzoug, Chemat, and Rezzoug (), the acoustic cavitation produced by ultrasound facilitates the penetration of solvent in the cellular walls of the vegetal matrix, allowing better release of compounds of interest into the extraction medium.…”

Ultrasound Assisted Extraction for the Recovery of Phenolic Compounds from Vegetable Sources

“…[30], reported significant statistical differences when comparing anthocyanin and tannin extraction yields using wave amplitudes of 20% and 50%, which suggests that a greater ultrasonic amplitude induces a greater number of cavities thus improving the extraction process. However, it is important to point out that the increase in extraction yields cannot be attributed exclusively to the abrasive effects or the turbulence created by ultrasonic waves, but also to the physical effects on the surface of the particles [31].…”

“…For this study the scaling parameter was also the solvent-solute ratio (approximately 1:15), using a multi-probe system with four titanium horns driven by the same electronic generator. Among other scaling studies, it is possible to consider the phenolic compounds of Pnus pinaste extraction [31], where the scaling parameter was the capacity of the reactor (1:10), with a capacity of 30 L. This obtained a total of 308.7 mg EQ/100 g DW.…”

Combined effect of attrition and ultrasound on the disruption of Pseudomonas putida for the efficient release of arginine deiminase

“…However, the precise mechanisms of the interaction between the beads and the ultrasonic waves are yet unknown. In literature, ultrasound, combined with many assistive techniques, has been found to improve cell wall disruption to maximize the extraction of intracellular contents …”

“…In literature, ultrasound, combined with many assistive techniques, has been found to improve cell wall disruption to maximize the extraction of intracellular contents. [37][38][39] Another important difference between bath and probe sonication that needs to be considered is the difference between actual power intensities of these techniques. Our previous research has demonstrated that essentially the same amount of ADI (22 U mL 21 ) was released when 15 mL of cell slurry (200 g L 21 ) was treated for 6 min of probe sonication at 187 W. 40 This translates to the power intensity of 12.5 Watts per mL of cellmass slurry, as most of this power is directly transmitted to the cellmass slurry.…”