PMID: 11902947Mar 21, 2002Paper

Precursors of 2-acetyl-1-pyrroline, a potent flavor compound of an aromatic rice variety

Journal of Agricultural and Food Chemistry
Tadashi YoshihashiHideo Inatomi

Abstract

The biological formation of a potent flavor compound, 2-acetyl-1-pyrroline, in the aromatic rice variety (Khao Dawk Mali 105) was studied in seedlings and callus of the rice. Concentrations of 2-acetyl-1-pyrroline were determined by GC-MS-SIM using an isotope dilution method. Increases in concentration occurred when proline, ornithine, and glutamate were present in solution, with proline increasing the concentration by more than 3-fold compared to that of the control. Results of tracer experiments using (15)N-proline, (15)N-glycine, and proline-1-(13)C indicated that the nitrogen source of 2-acetyl-1-pyrroline was proline, whereas the carbon source of the acetyl group was not the carboxyl group of proline. 2-acetyl-1-pyrroline was formed in the aromatic rice at temperatures below that of thermal generation in bread baking, and formed in the aerial part of aromatic rice from proline as the nitrogen precursor.

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May 21, 2008·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·F BourgisA Ghesquière
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