Summary
In order to verify the formation of endogenous 3-deoxyglucosone (3-DG), an intermediate compound in the Maillard reaction, we tried to detect 3-deoxyfructose (3-DF) which is main metabolite of 3-DG. Endogenous 3-DF was detected in the urine of normal and diabetic rats by the oral administration of 3-DG-free feed. Metabolizing activities of crude extracts prepared from porcine organs were examined using methylglyoxal (MG) and 3-DG as substrates. NAD- or NADP-dependent 2-oxoaldehyde dehydrogenase activity was detected in liver, kidney, small intestine and lung. On the other hand, NADH- or NADPH-dependent 2-oxoaldehyde reductase activity was detected in all porcine organs in which liver and kidney contained higher activity of NADPH-dependent enzyme than the other organs. The reductase which catalyzes the reduction of 3-DG to 3-DF and MG to acetol, was purified and characterized from porcine kidney. The enzyme was the same to NADPH-dependent-2-oxoaldehyde reductase from porcine liver, which is speculated to prevent the advanced stage of the Maillard reaction as a self-defense enzyme.
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Hayase, F., Liang, Z.Q., Suzuki, Y. et al. Enzymatic metabolism of 3-deoxyglucosone, a Maillard intermediate. Amino Acids 1, 307–318 (1991). https://doi.org/10.1007/BF00814000
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DOI: https://doi.org/10.1007/BF00814000