ALA

ALA
Name	Alpha-Linolenic Acid
IUPAC name	(9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid
Formula	C18H30O2
Molar mass	278.43 g·mol−1
CAS number	463-40-1

ALA

Alpha-linolenic acid is an essential omega-3 polyunsaturated fatty acid found in plants and some microorganisms. First characterized in early 20th-century lipid chemistry, it plays central roles in cardiovascular research, nutritional guidelines, and biochemical pathways studied by investigators associated with Harvard University, Johns Hopkins University, World Health Organization, American Heart Association, and Centres for Disease Control and Prevention. Its significance appears in comparative studies involving eicosapentaenoic acid, docosahexaenoic acid, linoleic acid, arachidonic acid, and dietary patterns examined in cohorts like the Framingham Heart Study and the Nurses' Health Study.

Definition and Nomenclature

Alpha-linolenic acid is defined by IUPAC as (9Z,12Z,15Z)-octadeca-9,12,15-trienoic acid and is classified as an omega-3 fatty acid in lipid taxonomy used by organizations such as the International Union of Pure and Applied Chemistry and the International Agency for Research on Cancer. Nomenclature conventions from American Chemical Society publications and monographs list synonyms including ALA, (α)-linolenic acid, and 18:3(n−3). Historical biochemical descriptions trace through researchers at University of Cambridge, Max Planck Society, and laboratories linked to the Rockefeller University.

Chemical Structure and Properties

The molecule contains an 18-carbon chain with three cis double bonds at carbon positions 9, 12, and 15, producing the omega-3 configuration shared with marine fatty acids studied in work by Scripps Institution of Oceanography and Woods Hole Oceanographic Institution. Physicochemical properties—melting point, refractive index, and oxidative susceptibility—are detailed in compendia from Merck Group and standards used by American Oil Chemists' Society. The cis geometry and conjugation status influence reactivity under conditions examined by researchers at Massachusetts Institute of Technology and École Normale Supérieure, including peroxidation assays and chromatography methods developed at National Institutes of Health and European Food Safety Authority laboratories.

Biological Roles and Metabolism

ALA serves as a precursor for long-chain omega-3 fatty acids via desaturation and elongation enzymes encoded in genomes analyzed by teams at Broad Institute and Wellcome Sanger Institute. Enzymes such as delta-6 desaturase and elongase, characterized in studies at University of California, Davis and University of Oxford, convert ALA to eicosapentaenoic acid and docosahexaenoic acid in varying efficiency across populations studied in projects like the Human Genome Project and the 1000 Genomes Project. Metabolic fates also intersect with pathways involving peroxisome proliferator-activated receptor signaling explored by investigators at Salk Institute and St. Jude Children's Research Hospital. Clinical investigations associated with Mayo Clinic, Cleveland Clinic, and Karolinska Institutet have examined tissue incorporation, membrane fluidity modulation, and roles in inflammatory mediator balance compared with substrates such as arachidonic acid.

Dietary Sources and Nutrition

Dietary ALA is abundant in plant oils and seeds highlighted in agricultural research from Iowa State University, University of Minnesota, and United States Department of Agriculture databases. Primary sources include flaxseed oil, chia seed, perilla oil, and walnuts—items cataloged in food composition tables used by Food and Agriculture Organization and European Commission nutrition panels. Public health recommendations from American Heart Association, British Dietetic Association, and Health Canada consider ALA intake alongside marine omega-3 sources studied in cohort analyses such as EPIC and Nurses' Health Study II. Nutrition intervention trials conducted at Johns Hopkins Bloomberg School of Public Health and London School of Hygiene & Tropical Medicine compare ALA-rich diets to fish oil supplements and examine biomarkers in populations from Japan, Norway, and Iceland.

Medical Uses and Therapeutic Research

Clinical trials and meta-analyses from institutions including Cochrane Collaboration, National Institutes of Health Clinical Center, and leading academic hospitals have evaluated ALA for cardiovascular risk reduction, cognitive outcomes, and inflammatory conditions. Randomized controlled trials conducted at University College London, University of Pennsylvania, and Imperial College London assess endpoints such as serum lipids, ischemic events, and neurodevelopmental measures compared with interventions using eicosapentaenoic acid and docosahexaenoic acid. Experimental research at University of California, San Francisco and Yale School of Medicine explores ALA's influence on signaling pathways relevant to Alzheimer's disease models, metabolic syndrome cohorts, and dermatological conditions investigated in clinics like Mayo Clinic.

Safety, Toxicity, and Interactions

Safety profiles summarized by European Food Safety Authority and Food and Drug Administration indicate low acute toxicity but note susceptibility to oxidative degradation, interactions with anticoagulant therapies reviewed by American College of Cardiology guidelines, and potential for lipoperoxidation studied in labs at University of Toronto and McGill University. Pharmacokinetic interactions with drugs metabolized by cytochrome P450 enzymes have been assessed in trials at Mount Sinai Health System and Karolinska Institutet. Adverse event reporting in population studies such as Framingham Heart Study and regulatory reviews from Health Canada document rare gastrointestinal and allergic responses tied to specific ALA-containing formulations.

Production, Synthesis, and Industrial Applications

Commercial production of ALA-rich oils is led by agricultural enterprises and biotechnology firms collaborating with research groups at University of Illinois Urbana-Champaign and Wageningen University. Traditional extraction from seeds and cold-pressing methods used in industry standards from Codex Alimentarius are complemented by enzymatic and microbial biosynthesis approaches developed at Novozymes, DuPont, and academic spin-offs from MIT and ETH Zurich. Industrial applications include functional foods, nutritional supplements marketed by companies such as Nestlé, DSM, and Bayer, and formulations in cosmetic and polymer industries investigated at Procter & Gamble and L'Oréal laboratories. Advanced metabolic engineering efforts aim to produce long-chain omega-3s in oilseed crops through collaborations like projects funded by the Bill & Melinda Gates Foundation and partnerships between Kew Gardens researchers and commercial breeders.

Category:Fatty acids