This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| alpha-tocopherol | |
|---|---|
| Name | alpha-tocopherol |
| Formula | C29H50O2 |
| Molar mass | 430.71 g·mol−1 |
| Melting point | 2–3 °C |
| Solubility | soluble in lipids |
alpha-tocopherol Alpha-tocopherol is the most biologically active form of vitamin E and a lipophilic antioxidant found in many foods and tissues. It was characterized through studies involving figures and institutions such as Paul Karrer, Linus Pauling, Harvard University, University of Chicago, and Swiss Federal Institute of Technology Zurich, and has been central to research across laboratories including National Institutes of Health, World Health Organization, and Max Planck Society. Its role in nutrition, medicine, and industry has engaged investigators connected with Royal Society, American Heart Association, Food and Agriculture Organization, and regulatory bodies like U.S. Food and Drug Administration.
The molecule possesses a chromanol ring linked to a phytyl tail, a structure elucidated by chemists at University of Zurich, ETH Zurich, University of Basel, University of Geneva, and groups associated with Paul Karrer and Otto Wallach. Its stereochemistry includes a chiral center at the 2R configuration studied in collaboration between Imperial College London, University of Cambridge, Massachusetts Institute of Technology, Stanford University, and California Institute of Technology. Physical properties such as low melting point and lipid solubility were reported in publications affiliated with Royal Society of Chemistry, American Chemical Society, Journal of the American Chemical Society, Nature, and Science. The compound’s antioxidant activity derives from the phenolic hydrogen on the chromanol ring, a mechanism examined by scientists at Max Planck Institute for Biophysical Chemistry, Cold Spring Harbor Laboratory, Salk Institute, Riken, and Institut Pasteur.
Alpha-tocopherol functions as a chain-breaking antioxidant in biological membranes, a concept advanced by researchers from Cambridge University, Yale University, Columbia University, University of Pennsylvania, and Johns Hopkins University. It protects polyunsaturated fatty acids in phospholipids in tissues studied across institutions including Mayo Clinic, Cleveland Clinic, Karolinska Institute, University College London, and University of Toronto. The vitamin E activity of alpha-tocopherol has been quantified using assays developed at Rockefeller University, Duke University, University of Michigan, University of California, San Francisco, and Karolinska Institutet. Its interactions with enzymes and transport proteins have been characterized by groups at ETH Zurich, University of Oxford, McGill University, University of British Columbia, and Weizmann Institute of Science.
Dietary alpha-tocopherol is abundant in plant oils and nuts; seminal compositional surveys were conducted by units within United States Department of Agriculture, Food and Agricultural Organization, World Health Organization, British Nutrition Foundation, and European Food Safety Authority. Major sources include sunflower oil, safflower oil, wheat germ oil, almonds, hazelnuts, and leafy vegetables catalogued by researchers at University of California, Davis, Iowa State University, University of Illinois, Cornell University, and University of Minnesota. Population intake patterns and dietary recommendations have been reported by panels including Institute of Medicine, National Health Service, European Food Safety Authority, American Academy of Pediatrics, and Academy of Nutrition and Dietetics.
Absorption in the intestine depends on micellar solubilization and chylomicron assembly, processes investigated at Beth Israel Deaconess Medical Center, Rigshospitalet, Mount Sinai Hospital, Karolinska University Hospital, and Sahlgrenska University Hospital. Transport proteins such as alpha-tocopherol transfer protein were cloned and studied in laboratories at University of Tokyo, Osaka University, Pasteur Institute, University of São Paulo, and Seoul National University. Metabolic pathways involving cytochrome P450 enzymes were elucidated in collaborations between National Cancer Institute, European Molecular Biology Laboratory, Max Planck Institute, Cold Spring Harbor Laboratory, and National Institute for Health and Care Research.
Clinical trials and epidemiological studies relating alpha-tocopherol to cardiovascular disease, cancer, and neurodegenerative conditions have involved consortia including Physicians' Health Study, Women’s Health Study, Framingham Heart Study, Nurses' Health Study, and Baltimore Longitudinal Study of Aging. Large randomized trials coordinated by National Heart, Lung, and Blood Institute, British Medical Journal, European Society of Cardiology, American Heart Association, and Cochrane Collaboration have shaped understanding of benefits and risks. Genetic disorders affecting vitamin E status were described in case series from Johns Hopkins Hospital, Great Ormond Street Hospital, Hospital for Sick Children, Royal Children's Hospital, and Boston Children's Hospital. Safety, upper intake levels, and interactions with anticoagulant therapy were examined by panels at U.S. Food and Drug Administration, European Medicines Agency, World Health Organization, Institute of Medicine, and National Institutes of Health.
Analytical determination of alpha-tocopherol employs high-performance liquid chromatography methods standardized by agencies including Association of Official Analytical Chemists, International Organization for Standardization, European Committee for Standardization, U.S. Pharmacopeia, and British Pharmacopoeia. Reference materials and quality control programs have been organized by National Institute of Standards and Technology, International Federation of Clinical Chemistry, Centers for Disease Control and Prevention, Food and Drug Administration, and World Health Organization. Clinical laboratories at Mayo Clinic Laboratories, Cleveland Clinic Laboratory Medicine, Quest Diagnostics, Laboratory Corporation of America, and Eurofins Scientific use validated procedures for plasma and serum alpha-tocopherol.
Industrial production of alpha-tocopherol includes extraction from botanical oils and chemical synthesis routes developed by companies and research centers such as BASF, DSM, Bayer, Pfizer, and Novartis, and academic groups at Technical University of Munich, Politecnico di Milano, University of Barcelona, Tsinghua University, and Beijing Institute of Pharmacology. Synthetic strategies employ chromatographic resolution, asymmetric synthesis, and biotechnological approaches pioneered at MIT, ETH Zurich, Max Planck Institute for Chemical Energy Conversion, Rothamsted Research, and Agricultural Research Service. Applications span dietary supplements, fortified foods, cosmetic formulations, and polymer stabilizers marketed by entities including Unilever, Procter & Gamble, L'Oréal, Nestlé, and General Mills.
Category:Vitamins