{"id":933,"date":"2019-08-22T09:00:18","date_gmt":"2019-08-22T09:00:18","guid":{"rendered":"http:\/\/horizon.peachpuff-wolverine-566518.hostingersite.com\/?p=933"},"modified":"2019-08-22T09:00:18","modified_gmt":"2019-08-22T09:00:18","slug":"magnets-are-being-used-to-extract-algal-molecules-for-the-beauty-bioplastics-industries","status":"publish","type":"post","link":"https:\/\/scienceblog.com\/horizon\/933\/magnets-are-being-used-to-extract-algal-molecules-for-the-beauty-bioplastics-industries\/","title":{"rendered":"Magnets are being used to extract algal molecules for the beauty, bioplastics industries"},"content":{"rendered":"
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Entrepreneurs in the aquaculture sector face a problem \u2013 extracting all the valuable molecules from seaweed and algal cells is still really difficult. But marine enzymes and magnets are now making it easier to remove precious molecules and can even turn microalgae into magnetically-guided \u2018vehicles\u2019 for targeted drug delivery.<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Algal cells contain all kinds of useful substances, such as omegas which are used in food supplements, proteins, anti-oxidants for beauty products, and organic chemicals that are used to make biodegradable alternatives to plastic.<\/p>\n

Unfortunately, more than half of the substances found in seaweed cannot be harvested.<\/p>\n

\u2018The problem with the industrial process of extracting alginate (a type of acid found in seaweed used in pharmaceuticals) is that 60% of the biomass will not be useable for anything else,\u2019 said Dr K\u00e9vin Cascella, a molecular marine biologist and project manager for a project called\u00a0GENIALG<\/a>.<\/p>\n

The project is using marine enzymes to ensure that all of the useful molecules found within algal cells can be extracted for industrial use.<\/p>\n

As a result of strides made in next generation sequencing and whole genome analysis of bacteria living on seaweed, GENIALG thought that relevant methods could be developed to overcome the stubborn seaweed cell wall.<\/p>\n

They began by selectively breeding seaweed for higher growth rates and a better yield, just as farmers have traditionally bred cattle for the best milk, but with an added dimension. By using genetic analysis techniques, the team is identifying the regions of the genome linked to specific traits. This could be the lipid content of a seaweed cell, for instance. Lipids are particularly interesting for nutraceuticals, the dietary supplements industry.<\/p>\n

The researchers then looked at how to improve the physical and biochemical extraction of biomolecules.<\/p>\n

Current industrial processes involve breaking seaweed cells apart by grinding or pressing. In this way, the cells go through a fractionation process to separate the liquid cell contents from the solid parts. Next, the compounds are removed with enzymes, which act as biological scissors, breaking the cell wall in specific places. Specific enzymes are used to generate and release particular valuable biomolecules.<\/p>\n

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Only about 40% of the substances found in seaweed can be harvested using industrial processes while everything else will go to waste. Image credit- GENIALG<\/figcaption><\/figure>\n<\/div>\n

Marine enzymes<\/strong><\/p>\n

GENIALG\u2019s researchers at the Roscoff Biological Station, France, have\u00a0been working on marine enzymes for the past 20 years, and they believe they\u2019ve found some bacterial enzymes that could produce higher yields than the commercial ones.<\/p>\n

\u2018The different kinds of enzyme combinations allow the degradation of the seaweed cell wall,\u2019 said Dr Cascella, adding that these combinations generate different kinds of molecules. The team tests the new molecules to see what they do and whether they could be useful in medical or other applications.<\/p>\n

The team has two pilot biorefinery plants and is building a biobank, where scientists and the general public can study strains of seaweed at different points in their life cycle. According to Dr Cascella, they\u2019ve already found a particular compound that has the potential to affect cancer cells, which they are currently investigating in more detail.<\/p>\n

Enzymes are not the only means of harvesting those sought-after compounds. Another method being investigated by other scientists involves the use of magnets.<\/p>\n

For microalgae to grow, photosynthesise and produce the biomolecules valued by different industries, they must be suspended in water and they have access to a light source. But light does not travel through water in a uniform way, and microalgal cells move around freely.<\/p>\n

The\u00a0VALUEMAG<\/a> project thought that magnets could keep the microalgal cells consistently close to a light source so that they would photosynthesise at the maximum rate. They insert tiny iron nanoparticles inside microalgal cells to ‘magnetise\u2019 them, using a new device developed by the project. The cells are then spread across a cone with a magnetic surface and fed with a constant stream of water and light. This ensures that they are producing as many biomolecules as possible.<\/p>\n

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\u2018The problem with the industrial process of extracting alginate (a type of acid found in seaweed used in pharmaceuticals) is that 60% of the biomass will not be useable for anything else.\u2019<\/span><\/p>\n

– Dr K\u00e9vin Cascella, molecular marine biologist, GENIALG<\/span><\/p>\n<\/blockquote>\n

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Magnets<\/strong><\/div>\n<\/div>\n

When it\u2019s time to harvest those useful biomolecules, magnets are used once again.<\/p>\n

The team first uses a process called \u2018supercritical CO2 extraction\u2019 to break the microalgae cells.<\/p>\n

When the cells are broken apart, the researchers are left with a solution of microalgal extracts and nanoparticles. To remove the molecules that they want, such as proteins or lipids, the project uses a new technique that they developed called \u2018selective magnetic separation\u2019, says Professor Evangelos Hristoforou, the director of the Laboratory of Electronic Sensors at the National Technical University of Athens, Greece, and VALUEMAG\u2019s project coordinator.<\/p>\n

The method involves covering the nanoparticles with ligands \u2013 tiny molecules that bind to other molecules, like a kind of biochemical velcro. The ligand is specifically attracted to one particular target molecule and so will \u2018catch\u2019 the relevant molecule. Because the nanoparticle is magnetised, exposing the mixture to a magnet allows the caught molecule as well as the ligand and the nanoparticle to be pulled out of the mixture. One final step separates the ligand and the nanoparticle, and the molecule is released.<\/p>\n

As the two methods don\u2019t require any chemicals, the extracts are safe to eat or use in cosmetics.<\/p>\n

VALUEMAG\u2019s research also has potential biomedical applications. The scientists discovered that magnetised microalgal cells could replace human stem cells used to deliver drugs.<\/p>\n

Cell therapy<\/strong><\/p>\n

Currently, human stem cells are injected with drugs that are guided through the body and released at a specific point. The technique is called cell therapy, but the problem with this is that human stem cells can be rejected by the body or worse, turn cancerous.<\/p>\n

Microalgae don\u2019t have this kind of problem.<\/p>\n

Microalgal cells can be injected with iron nanoparticles and the drug that needs to be released in the body. The cells can then be guided by a clinician using magnets to the correct place within the body \u2013 for example, drugs to tackle liver cancer should be released close to the liver.<\/p>\n

\u2018They cannot grow in our bodies because they are not human cells,\u2019 said Dr Angelo Ferraro, chief biologist for\u00a0VALUEMAG<\/a>. \u2018And they are less immunogenic, so they can be used as a vehicle for clinical therapies.\u2019<\/p>\n

The research in the article was funded by the EU. If you<\/em>\u00a0liked this article, please consider sharing it on social media.<\/em><\/p>\n

Originally published on Horizon<\/a>.<\/em><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Entrepreneurs in the aquaculture sector face a problem \u2013 extracting all the valuable molecules from seaweed and algal cells is still really difficult. But marine enzymes and magnets are now making it easier to remove precious molecules and can even turn microalgae into magnetically-guided \u2018vehicles\u2019 for targeted drug delivery. Algal cells contain all kinds of … Read more<\/a><\/p>\n","protected":false},"author":325,"featured_media":935,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"generate_page_header":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11,12],"tags":[4,37,79,24,295],"class_list":["post-933","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-earth-energy-environment","category-health","tag-environment","tag-health","tag-research","tag-science","tag-seaweed"],"yoast_head":"\nMagnets are being used to extract algal molecules for the beauty, bioplastics industries - Horizon Magazine Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/scienceblog.com\/horizon\/933\/magnets-are-being-used-to-extract-algal-molecules-for-the-beauty-bioplastics-industries\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Magnets are being used to extract algal molecules for the beauty, bioplastics industries\" \/>\n<meta property=\"og:description\" content=\"Entrepreneurs in the aquaculture sector face a problem \u2013 extracting all the valuable molecules from seaweed and algal cells is still really difficult. 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