Characterization and quantification of γ-oryzanol in Korean rice landraces

• Published in: Journal of cereal science 2019-07, Vol.88, p.150-156
• Main Authors: Cho, Yang-Hee, Lim, Seon-Young, Rehman, Abdul, Farooq, Muhammad, Lee, Dong-Jin
• Format: Article
• Language: English
• Subjects: Landraces; Oryzanol; Phytosterol ferulates; Rice bran
• ISSN: 0733-5210; 1095-9963
• DOI: 10.1016/j.jcs.2019.05.019

Rice grain contains several functional compounds. Among these, γ-oryzanol is one of the most important owing to its biological role in human physiology. This study was conducted to determine the γ-oryzanol in Korean rice landraces, and classify them based on grain γ-oryzanol composition and contents. Ten fractions of γ-oryzanol were identified in the tested landraces with total γ-oryzanol contents ranging from 0.69 to 51.40 mg/100 g. Among individual components, 24-ethylene cycloartanyl ferulate, cycloartenyl ferulate, campesteryl ferulate and sitosteryl ferulate contributed to ∼90% of total γ-oryzanol with the highest values in landraces Paldado, Jaeraeryukdo, Ichun7ilchal and Dudo respectively, while △7-sitostenyl ferulate constituted only ∼0.30% of total γ-oryzanol. Korean rice landraces were classified in six groups based on oryzanol composition. Group 1 was glutinous rice with high oryzanol content (19.44 mg/100 g hulled rice), while group 2 had the lowest oryzanol content (9.57 mg/100 g hulled rice) with late maturation. Colored rice landraces included in group 5 had high oryzanol contents (17.02 mg/100 g hulled rice). Campesteryl ferulate contents were higher in non-glutinous rice. γ-oryzanol composition pattern can serve as basis for classification of Korean rice landraces, and for use in the breeding programs to develop γ-oryzanol rich rice cultivars. •Ten fractions of γ-oryzanol were identified in Korean rice landraces.•Total γ-oryzanol contents ranged from 0.69 to 51.40 mg/100 g.•Major γ-oryzanol components were 24-ethylene cycloartanyl ferulate, cycloartenyl ferulate and campesteryl ferulate.•Highest γ-oryzanol contents were noted in landraces Paldado, Jaeraeryukdo and Ichun7ilchal.•The colored rice landraces had high oryzanol contents.