米の品質劣化の評価にむけたXYZ系微弱発光法の適用

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By using rice grains as an example of the application of XYZ chemiluminescence to food products, we analyzed factors that affected the photon emission. The X photon emission curve of rice consists of primary emission, with a peak immediately after mixing, and persistent secondary emission. It is similar to the XYZ standard photon emission curve and requires continuous measurement after the reagent is injected. The results of the analysis showed that maximum photon emission intensity and the emission curve were changed markedly by changing the grain size of the rice. The results of the analysis also showed that solid samples such as rice needed to be ground into an uniform size to achieve accurate measurements. The maximum intensity of the primary photon emission was comparable in air and nitrogen gas. Under air, after the intensity had peaked it decreased and then increased again. We inferred that, after the primary emission, secondary emission was sustained by the reaction of the Y reagent (gallic acid) with remaining concentration and oxygen in the air in the presence of the Z reagent (catalyst). This suggests that air should be replaced with nitrogen gas for accurate measurements. A strong correlation between fat acidity (the deterioration index of rice) and photon emission intensity was observed. This indicates that X photon emission shows the level of lipid peroxides and that integrated photon emission is an appropriate analysis index for solid samples. The approach used here, which requires only a small sample, has a low level of environmental impact and is quick and effective in measuring deterioration in the quality of rice grain.
生態工学会の論文
2007-04-30

米の品質劣化の評価にむけたXYZ系微弱発光法の適用

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