caa a22 4500 388063475 CHVBK 20180307125127.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1079/BJN19980007 doi S0007114598000087 pii (NATIONALLICENCE)cambridge-10.1079/BJN19980007 Lignan and isoflavonoid concentrations in tea and coffee [Elektronische Daten] Tea is a beverage consumed widely throughout the world. The existence in tea of chemopreventing compounds possessing antimutagenic, anticarcinogenic and antioxidative properties has been reported. High intakes of tea and foods containing flavonoids have recently been shown to be negatively correlated to the occurrence of CHD. However, tea may contain other compounds with similar activities. Using a new gas chromatographic-mass spectrometric method we measured lignans and isoflavonoids in samples of twenty commercial teas (black, green and red varieties) and, for comparison, six coffees. Both unbrewed and brewed tea were investigated. The analysis of the teas yielded relatively high levels of the lignans secoisolariciresinol (5.6-28.9 mg/kg; 15.9-81.9 μmol/kg) and matairesinol (0.56-4.13 mg/kg; 1.6-11.5 μmol/kg) but only low levels of isoflavonoids. Because the plant lignans, as well as their mammalian metabolites enterolactone and enterodiol, have antioxidative properties and these mammalian lignans occur in high concentrations in plasma, we hypothesize that lignan polyphenols may contribute to the protective effect of tea on CHD. Copyright © The Nutrition Society 1998 Tea nationallicence Coffee nationallicence Phyto-oestrogens nationallicence Lignans nationallicence Mazur W. M. Department of Clinical Chemistry, University of Helsinki and Folkhälsan Research Center, PO Box 60, FIN-00014 Helsinki, Finland Wähälä K. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland Rasku S. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland Salakka A. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland Hase T. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland Adlercreutz H. Department of Clinical Chemistry, University of Helsinki and Folkhälsan Research Center, PO Box 60, FIN-00014 Helsinki, Finland British Journal of Nutrition Cambridge University Press 79/1(1998-01), 37-45 0007-1145 79:1<37 1998 79 BJN https://doi.org/10.1079/BJN19980007 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1079/BJN19980007 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mazur W. M. Department of Clinical Chemistry, University of Helsinki and Folkhälsan Research Center, PO Box 60, FIN-00014 Helsinki, Finland NATIONALLICENCE 700 1- Wähälä K. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland NATIONALLICENCE 700 1- Rasku S. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland NATIONALLICENCE 700 1- Salakka A. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland NATIONALLICENCE 700 1- Hase T. Department of Chemistry, PO Box 55, FIN-00014 Helsinki, Finland NATIONALLICENCE 700 1- Adlercreutz H. Department of Clinical Chemistry, University of Helsinki and Folkhälsan Research Center, PO Box 60, FIN-00014 Helsinki, Finland NATIONALLICENCE 773 0- British Journal of Nutrition Cambridge University Press 79/1(1998-01), 37-45 0007-1145 79:1<37 1998 79 BJN CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge