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In addition to the common polyunsaturated fatty acids (FA) such as those of the n-3 and n-6 series with major interest in health and nutrition, marine organisms (invertebrates and algae) produce unique FA including branched, methoxylated, halogenated, acetylenic and non-methylene-interrupted structures. The biosynthetic pathways, and the structural and functional roles of these uncommon FA are often not yet known. This short overview wishes to be an outline on the particular FA classes possessing uncommon structures, especially those of increasing interest regarding their promising biological activities.
This work focuses on the treatment of washing waters coming from surimi manufacturing using ultrafiltration technology at a laboratory scale. Four membrane materials (poly-ether sulfone, polyacrilonytrile, poly vinylidene fluoride and regenerated cellulose) and 5 Molecular Weight Cut-Off (from 3 to 100 kDa) have been studied at bench laboratory scale using the pilot Rayflow 100, commercialised by Rhodia Orelis. The investigation deals with the ability for membranes to offer a high retention of biochemical compounds (proteins and lipids). Results obtained during adsorption tests showed that the regenerated cellulose material seems to be the most appropriate with regards to pore size reduction due to the protein-adsorption. During the ultrafiltration of the washing water, the regenerated cellulose material leads to the best results, followed by the polyacrylonitrile and poly-vinylidene fluoride materials. Poor results were obtained with polyether sulfone membrane. Compared to the other materials, the regenerated cellulose is the easiest to regenerate, with minimal cleaning water and no chemical treatment necessary. Biochemical characterization of the fractions generated during the ultrafiltration with the polyacrilonytrile, poly vinylidene fluoride and regenerated cellulose membranes showed that all the membranes provided a high recovery rate of the lipids and proteins. The 10 kDa regenerated cellulose membrane had the highest performance and was further evaluated. With such a treatment, the chemical oxygen demand was reduced by 75%. By performing hydrolysis followed by a centrifugation, biochemical composition of the sludge and liquid fraction were modified, producing an insoluble fraction containing fats and few proteins and a soluble fraction containing proteins and few fats. The sludge, initially insoluble, was mainly solubilized during hydrolysis, and lipids and peptides were concentrated by ultrafiltration.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSponge Fatty Acids, 5. Characterization of Complete Series of 2-Hydroxy Long-Chain Fatty Acids in Phospholipids of Two Senegalese Marine Sponges from the Family Suberitidae: Pseudosuberites sp. and Suberites massaGilles Barnathan, Jean-Michel Kornprobst, Pierre Doumenq, Joseph Miralles, and Nicole Boury-EsnaultCite this: J. Nat. Prod. 1993, 56, 12, 2104–2113Publication Date (Print):December 1, 1993Publication History Published online1 July 2004Published inissue 1 December 1993https://pubs.acs.org/doi/10.1021/np50102a012https://doi.org/10.1021/np50102a012research-articleACS PublicationsRequest reuse permissionsArticle Views215Altmetric-Citations25LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
تم التعرف على الأحماض الدهنية الفسفوليبيدية لستة أنواع من اسفنج هالوسكاليدا الذي ينمو في قطر باستخدام كروماتوجرافيا الغاز وطيف الكتلة. وتم فصل أكثر من مائة حمض دهني مشبع وغير مشبع. وأوضحت الدراسة وجود فارق كبير في بنية الأحماض الدهنية المشبعة وغير المشبعة بين ثلاثة فصائل هي: كاليسبونجيا و جليوديس ونيفاتس كما تم التعرف على حمض دايانويك جديد 14-Me-5, 9-7 وبعض الأحماض الدهنية النادرة. كما أن الدراسة أوضحت اختلاف واضح في مكونات الأحماض الدهنية التي تنتمي إلى عائلة n-7 لأسفنج جليوديس حيث تراوحت نسبتها من صفر إلى 18% .
