The eight vitamers of vitamin E (alpha-, beta-, gamma-, and delta-tocopherols and -tocotrienols) have different antioxidant and biological activities and have different distributions in foods. Some cereals, especially oat, rye, and barley, are good sources of tocotrienols. A fast procedure for the determination of tocopherols and tocotrienols (tocols) in cereal foods was developed. It involves sample saponification and extraction followed by normal phase high-performance liquid chromatography (HPLC). The results have been compared with those found by direct extraction without saponification. The method is sensitive and selective enough to be tested on a wide variety of cereal samples. The highest tocol levels were found in soft wheat and barley (similar to75 mg/kg of dry weight). beta-Tocotrienol is the main vitamer found in hulled and dehulled wheats (from 33 to 43 mg/kg of dry weight), gamma-tocopherol predominates in maize (45 mg/kg of dry weight)), and alpha-tocotrienol predominates in oat and barley (56 and 40 mg/kg of dry weight, respectively).
|Digital Object Identifier (DOI):||10.1021/jf030009v|
|Codice identificativo ISI:||WOS:000183824200006|
|Codice identificativo Scopus:||2-s2.0-0037677449|
|Appare nelle tipologie:||1.1 Articolo in rivista|