Abstract
Nε-(hexanoyl)lysine (HEL) is known to be an oxidative lipid-decomposition product, and a powerful marker indicating oxidative stress in animal tissue. We investigated whether HEL could be useful as a marker in rice seeds damaged by oxidative stress during storage, as well as animals. We could show an accumulation of HEL in rice stored at high temperature (40 °C). This result significantly corresponded with an accumulation of TBARS. Rice germination deteriorated with non-enzymatic lipid peroxidation during storage at high temperature for a few months. These results suggested that a deterioration of rice germination ability resulted from oxidative damage caused by lipid peroxidation during storage. Moreover, HEL could become a useful marker for oxidative stress induced by lipid peroxidation. In addition, the activities of antioxidant enzymes, catalase and superoxide dismutase, significantly decreased in the rice seeds during storage at 40 °C. The relationship between accumulation of HEL and increases in antioxidant enzymes activities must be further studied. But, these results suggest that HEL might be a useful marker of oxidative stress in rice as well as in animals.
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Abbreviations
- HEL:
-
Nε-(hexanoyl)lysine
- DT:
-
o, o-dityrosine
- NT:
-
Nitrotyrosine
- TBARS:
-
Thiobarbituric acid-reactive substance
- ELISA:
-
Enzyme-linked immunosorbent assay
- AOS:
-
Activated oxygen species
- LOX:
-
Lipoxygenase
- CAT:
-
Catalase
- Mn-SOD:
-
Manganese – superoxide dismutase
- Cu, Zn-SOC:
-
Copper, Zinc – superoxide dismutase
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Acknowledgment
I am deeply grateful to Professor Toshihiko Osawa of Aichi-gakuin University and Professor Yoji Kato of University of Hyogo for their guidance and support.
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Minato, Ki. (2014). Hexanoyl-Lysine as a Deterioration Marker for Rice During Storage. In: Kato, Y. (eds) Lipid Hydroperoxide-Derived Modification of Biomolecules. Subcellular Biochemistry, vol 77. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7920-4_6
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DOI: https://doi.org/10.1007/978-94-007-7920-4_6
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