Two rice cultivars harvested in 2013 were supplied by the Korean Rural Developmental Administration (KRDA) (Suwon, Korea). Tocopherols (17–20) and tocotrienols (21–24) standards were purchased from Merck (Darmstadt, Germany) and their purity was >99%. 5α-Cholestane was purchased from Sigma–Aldrich Co. (St. Louis, MO, USA) with a purity of 95%. γ-Oryzanol (9–12) standards (purity; >98%) were obtained from Waco Pure Chemical Industries Ltd. (Osaka, Japan). Other chemicals used in this study were purchased as analytical grade unless otherwise noted.