Related Experiment Video
Updated: Jan 27, 2026
Changing the Direction and Orientation of Electric Field During Electric Pulses Application Improves Plasmid Gene Transfer in vitro
Published on: September 12, 2011
Extraction of valuable compounds from Arthrospira platensis using pulsed electric field treatment
Débora Pez Jaeschke1, Giovana Domeneghini Mercali2, Ligia Damasceno Ferreira Marczak1
1Chemical Engineering Department, Federal University of Rio Grande do Sul, Engenheiro Luiz Englert Street, Porto Alegre, RS 90040-040, Brazil.
Abstract:
Pulsed electric field (PEF) treatment was evaluated for phycocyanin and proteins extraction from Arthrospira platensis (Spirulina platensis). PEF extractions were performed using different specific energies (28, 56 and 122 J·ml-1 of suspension) and the results were compared to the extraction with bead milling. At highest PEF-treatment energies a damage of the cell morphology could be observed and the highest yields (up to 85.2 ± 5.7 mg·g-1 and 48.4 ± 4.4 g·100 g-1 of phycocyanins and proteins, respectively) could be obtained at 122 and 56 J·ml-1. The yields increased with incubation time after PEF-treatment. The antioxidant capacity of the extracts obtained after PEF-treatment was higher than of those obtained after bead milling. PEF treatment is a promising technology to obtain blue-green antioxidant extracts from A. platensis in an environmental friendly process.
Related Concept Videos
01:16Electric Field
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
01:13Finding Electric Potential From Electric Field
01:12Determining Electric Field From Electric Potential
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
01:25Electric Field Lines
The solution to this problem is to use electric field lines, which are not vectors but...
01:23Induced Electric Fields
01:20Electric Field Inside a Conductor
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...