茶葉および茶浸出液中のアルミニウムおよびマンガン含有量

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We measured the contents of aluminum and manganese in tea leaves and tea infusions by means of various standardized infusion conditions, and by using flameless atomic absorption spectrophotometry, and investigated the influence of infusion conditions on the elution of aluminum and manganese into the tea infusions. Furthermore, we tried to estimate the daily intake of aluminum and manganese due to drinking tea infusions. The content of aluminum in tea leaves was 1420μg/g in case of wulong tea, 576μg/g in black tea, and 520μg/g in green tea. The content of manganese was 1440μg/g in the case of wulong tea, 670μg/g in green tea, and 535μg/g in black tea. The concentration of aluminum in tea infusions was 1.49-5.58μg/ml in wulong tea, 0.90-4.92μg/ml in green tea, and 0.64-4.35μg/ml in black tea. The concentration of manganese was 1.75-6.67μg/ml in green tea, 0.94-4.04μg/ml in wulong tea, and 0.78-3.24μg/ml in black tea. The ratio of the molar concentration of aluminum to that of manganese was 1-2: 1 In tea leaves, and 1-5: 1 in tea infusions. In the case of elevated-temperature infusion, increases of the concentrations of aluminum and manganese in tea infusions were recognized. By repeating infusion three times according to the standard method for ingredient analysis of food, 18-29% of the total content of aluminum in tea leaves was eluted, and 12-29% of the total content of manganese was eluted. It was found that there were some components that were easy and others that were difficult to elute in both aluminum and manganese compounds. Almost all contents of aluminum and manganese that were easily eluted were eluted by the first and second infusion. Aluminum was easily eluted in case of black tea, while manganese was easily eluted in the case of green tea. From the tea infusions of 500ml, the estimated intake of aluminum was 1.4-2.1mg/day, and that of manganese was 1.2-2.9mg/day, and they were estimated to be 31-47% of aluminum intake and 32-79% of manganese intake from food.
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茶葉および茶浸出液中のアルミニウムおよびマンガン含有量

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