Microalgae have turned out to be a potential alternative to the use of synthetic sources for these ingredients. Spirulina is a type of microalgae that has been consumed by humans since the times of pre-Columbian America, and it naturally produces antioxidants (like carotenoids and Xanthophylls), and antimicrobial compounds like polysaccharides or fatty acids among other beneficial substances.
The extraction process using supercritical fluids, (supercritical fluids are any substance above certain set pressure and temperature conditions known as their critical point, that grants them physical properties in between those of liquids and gases) has taken shape in the last few years as an alternative to the classic extraction means. It shortens the extraction times and does not require the use of organic solvents that damage health and the environment. The most common supercritical fluid used is carbon dioxide, because of its zero toxicity, versatility, price and relatively soft critical conditions (73 bar, 31 ºC), besides these advantages, being a gas at room temperature, it does not leave residue in the extracted substance.
The work carried out by the associated unit for food science Universidad Autónoma de Madrid –Consejo Superior de Investigaciones Científicas consisted in the development of an extraction method using supercritical CO2 and the posterior analysis of the obtained substance by in vitro methods to evaluate its antioxidant and antimicrobial capabilities. Then a chemical analysis of the extract was carried out using chromatographical techniques in order to correlate the activity of the substance to its chemical composition.
The results show that the Spirulina microalgae could be a good source of functional food ingredients with antioxidant action thanks to the presence of carotenoids deriving from chlorophyll, and bacterial growth inhibiting action thanks to certain fatty acids. In optimal extraction conditions (220 bar y 55 ºC) an extract can be obtained with both a high activity as an antioxidant and antimicrobial action, thanks to the combined method of extraction-fractionation developed by this research group.
Oficina de Cultura Científica | alfa
One step closer to reality
20.04.2018 | Max-Planck-Institut für Entwicklungsbiologie
The dark side of cichlid fish: from cannibal to caregiver
20.04.2018 | Veterinärmedizinische Universität Wien
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
Stable joint cartilage can be produced from adult stem cells originating from bone marrow. This is made possible by inducing specific molecular processes occurring during embryonic cartilage formation, as researchers from the University and University Hospital of Basel report in the scientific journal PNAS.
Certain mesenchymal stem/stromal cells from the bone marrow of adults are considered extremely promising for skeletal tissue regeneration. These adult stem...
In the fight against cancer, scientists are developing new drugs to hit tumor cells at so far unused weak points. Such a “sore spot” is the protein complex...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
20.04.2018 | Physics and Astronomy
20.04.2018 | Interdisciplinary Research
20.04.2018 | Physics and Astronomy