γ-Oryzanol, tocol and mineral compositions in different grain fractions of giant embryo rice mutants
Version of Record online: 1 DEC 2011
Copyright © 2011 Society of Chemical Industry
Journal of the Science of Food and Agriculture
Volume 92, Issue 7, pages 1468–1474, May 2012
How to Cite
Jeng, T. L., Shih, Y. J., Ho, P. T., Lai, C. C., Lin, Y. W., Wang, C. S. and Sung, J. M. (2012), γ-Oryzanol, tocol and mineral compositions in different grain fractions of giant embryo rice mutants. J. Sci. Food Agric., 92: 1468–1474. doi: 10.1002/jsfa.4728
- Issue online: 4 APR 2012
- Version of Record online: 1 DEC 2011
- Manuscript Accepted: 27 SEP 2011
- Manuscript Revised: 16 SEP 2011
- Manuscript Received: 26 APR 2011
- giant embryo;
BACKGROUND: Rice embryo is concentrated with lipid, protein and some bioactive chemicals. Two rice mutants IR64-GE and TNG71-GE (M7 generation) were characterised by an enlarged embryo compared with their wild types. In the present study, distributions of protein, lipid, total phenolics, γ-oryzanol, tocols and some essential minerals in these two giant embryo mutants and their respective normal embryo wild types IR64 and TNG71 were compared.
RESULTS: The embryo dry weights of giant embryo mutants IR64-GE and TNG71-GE were 0.92 and 1.32 mg per seed respectively. These values were higher than those of their respective normal embryo genotypes (0.50 and 0.62 mg per seed). Large variations in protein, lipid, phenolic, γ-oryzanol, tocol and minerals levels were found between mutant and wild-type pairs. The brown rice of TNG71-GE had higher total γ-oryzanol (average of 24% increase) and total tocol (average of 75% increase) levels than TNG71, IR64 and IR64-GE.
CONCLUSION: The embryo and bran parts of giant embryo mutant TNG71-GE were found to be good sources of vitamin E and γ-oryzanol. Therefore it could be used to produce high-value by-products from milled embryo and bran parts and as a genetic resource for rice improvement programmes. TNG71-GE can also be used as a nutrient-fortified rice cultivar. Copyright © 2011 Society of Chemical Industry