Application of imaging mass spectrometry for the analysis of Oryza sativa rice
Article first published online: 20 AUG 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Rapid Communications in Mass Spectrometry
Volume 24, Issue 18, pages 2723–2729, 30 September 2010
How to Cite
Zaima, N., Goto-Inoue, N., Hayasaka, T. and Setou, M. (2010), Application of imaging mass spectrometry for the analysis of Oryza sativa rice. Rapid Commun. Mass Spectrom., 24: 2723–2729. doi: 10.1002/rcm.4693
- Issue published online: 20 AUG 2010
- Article first published online: 20 AUG 2010
- Manuscript Accepted: 3 JUL 2010
- Manuscript Revised: 1 JUL 2010
- Manuscript Received: 4 JUN 2010
Rice is one of the most important food crops in the world and new varieties have been bred for specific purposes, such as the development of drought-resistance, or the enrichment of functional food factors. The localization and composition of metabolites in such new varieties must be investigated because all artificial interventions are expected to change the metabolites of rice. Imaging mass spectrometry using matrix-assisted laser desorption/ionization (MALDI-IMS) is a suitable tool for investigating the localization and composition of metabolites; however, suitable methodologies for the MALDI-IMS analysis of rice have not yet been established. In this study, we optimized the methods for analyzing rice grains by MALDI-IMS using adhesive film and found the characteristic distribution of metabolites in rice. Lysophosphatidylcholine (LPC) was localized in the endosperm. Phosphatidylcholine (PC), γ-oryzanol and phytic acid were localized in the bran (germ and seed coat), and α-tocopherol was distributed in the germ (especially in the scutellum). In addition, MALDI-IMS revealed the LPC and PC composition of the rice samples. The LPC composition, LPC (1-acyl 16:0), LPC (1-acyl 18:2), LPC (1-acyl 18:1) and LPC (1-acyl 18:0), was 59.4 ± 4.5%, 19.6 ± 2.5%, 14.2 ± 4.5% and 6.8 ± 1.4%. The PC composition, PC (diacyl 16:0/18:2), PC (diacyl 16:0/18:1), PC (diacyl 18:1/18:3), PC (diacyl 18:1/18:2) and PC (diacyl 18:1/18:2), was 19.6 ± 1.0%, 21.0 ± 1.0%, 15.0 ± 1.4%, 26.7 ± 0.7% and 17.8 ± 1.9%. This approach can be applied to the assessment of metabolites not only in rice, but also in other foods for which the preparation of sections is a challenging task. Copyright © 2010 John Wiley & Sons, Ltd.