核磁気共鳴と示差熱分析による落がん粉中の水の状態についての研究(食品中の水の状態について-1-)

概要

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State of water in "Rakugan-ko" was studied by PMR and DTA. "Rakugan-ko" is the raw material of Japanese cake "Rakugan, " and is prepared by roasting of cooked waxy rice powder. Mixing with water, "Rakugan-ko" specimen containing 13_??_80% water were prepared. From the line width of 60MHz high-resolution PMR signal of water at 25 and 80°C, it was found that water is in three different states. From thermogram obtained by heating 10°C/min from room temperature to 200°C, two endothermic peaks near 80 and 120°C were observed, which are caused by evaporation of water. From these results, it was concluded that water in "Rakugan-ko" is in three different states, which are two bound states and one free state. Furthermore, from the measurement of the specimen preserved at 5°C for 3_??_5 days, it was confirmed that retrogradation is the change of bound water to free water.
社団法人日本農芸化学会の論文