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Changes in lipid substances in rice during grain development.

Nam Ho Kim¹, Jieun Kwak², Ji Yeon Baik¹

¹Department of Food and Nutrition, Korea University, Seoul, Republic of Korea; BK21PLUS Program in Embodiment: Health-Society Interaction, Department of Public Health Sciences, Graduate School, Korea University, Seoul 136 703, Republic of Korea.

|May 30, 2015

Summary

Investigating lipid substances in rice development revealed dynamic changes in fatty acids, γ-oryzanol, policosanols, and tocols across two cultivars. Findings highlight cultivar-specific variations in lipid profiles during grain maturation.

Keywords:

Fatty acid Grain development Gramineae Policosanol Rice (Oryza sativa L.)Tocopherol Tocotrienol γ-Oryzanol

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Area of Science:

Agricultural Science
Biochemistry
Food Science

Background:

Rice (Oryza sativa) is a global staple, and understanding its nutritional composition during development is crucial.
Lipid substances like fatty acids, γ-oryzanol, policosanols, and tocols contribute significantly to rice's nutritional and functional properties.
Variations in these lipid profiles can be influenced by genetic factors and developmental stages.

Purpose of the Study:

To investigate the developmental changes in lipid substances (fatty acids, γ-oryzanol, policosanols, tocols) in two rice cultivars.
To compare the lipid profiles of Ilpum and Dasan rice cultivars during different developmental stages.
To provide detailed information on the levels and composition of key lipids during rice grain development.

Main Methods:

Analysis of lipid extract levels and composition in Ilpum and Dasan rice cultivars.
Quantification of fatty acids, γ-oryzanol, policosanols, and tocol isomers at various developmental stages.
Comparative analysis of lipid profiles between the two cultivars throughout rice development.

Main Results:

Lipid extract levels decreased after reaching a maximum, with cultivar-specific differences in fatty acid composition.
γ-oryzanol levels increased during development, showing distinct compositional differences between Ilpum and Dasan.
Policosanol levels decreased sharply in early development, while total tocol levels trended downwards, with varying predominant tocol isomers (α-tocopherol or γ-tocotrienol) based on cultivar and stage.

Conclusions:

Rice lipid profiles, including fatty acids, γ-oryzanol, policosanols, and tocols, undergo significant changes during development.
Cultivar-specific differences exist in the accumulation and composition of these lipid substances.
This research provides valuable insights into the dynamic changes of bioactive lipids in rice, relevant for breeding and nutritional studies.