透析食のリン含有量の実測値と計算値

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  • Comparison of the measured and calculated values of phosphorus concentrations in the foods for dialysis patients (renal diets)
  • トウセキショク ノ リン ガンユウリョウ ノ ジッソクチ ト ケイサンチ

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We examined differences in the phosphorus concentrations in renal diets between those calculated using the “Standard Table of Food Composition in Japan” (5th revised edition) and those determined by actual measurements.<br>Thirty-six recipes were randomly chosen from certain card-style recipes, for renal diets, available on the market in Japan, and these recipes were used to prepare test samples of diets.<br>The measurement of the amount of phosphorus in a meal was made with Molybdenum blue absorptiometry, and with Inductively Coupled Plasma Optical Emission Spectrometry (ICP). Then, these measured values were compared with those calculated by using the Standard Table.<br>1. The results showed that the measured value of phosphorus concentration was 294.1±60.5mg (mean±SD) per meal, while the calculated value was 227.7±28.8mg per meal in terms of thirty-six sample diets. There was a significant difference between values obtained using these two methods (unpaired t-test p<0.005). 2. The ratios of the measured values to the calculated values of phosphorus concentrations in meals ranged from 0.55 to 2.72. The mean ratio of the measured values to the calculated values was 1.30±0.53 (median: 1.18). Fifty percent of all sample diet demonstrated ratios greater than 1.2. 3. The measured value of phosphorus in three combined meals for 30g, 40g, 50g, and 60g-protein diets (for twelve days, altogether) exceeded 700mg. 4. With regard to the cooking style used for meal preparation, 73% (11 of 15 meals) of Western style meals resulted in ratios (measured/calculated values of phosphorus contents) greater than 1.0, followed by Japanese style: 69% (11 of 16 meals), and Chinese style: 60% (3 of 5 meals). 5. We confirmed that values of phosphorus concentrations measured by Molybdenum blue absorptiometry and ones measured by ICP methods were highly correlated (r=0.964, p<0.05).<br>As the Standard Table compiles one standard value per one food item, variety of circumstances in which foodstuffs are produced, such as growing/breeding fields, soil, species, fertilizer/livestock feed, or climate, results in differences between actually measured values of particular foods and calculated values based on the Standard Table.<br>This study indicates the degree to which these two values differ in terms of phosphorus in 36 sample diets. Thus, it is suggested that we must perform multiple assessments when counseling patients on nutritional intake.

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