Examination of nitrogen amount in food by a combustion method.
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Accession number;03A0735168
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| Title;Examination of nitrogen amount in food by a combustion method. |
| Author;
SASAKI HIROKO
(Seitokudai Jimbun)
OKUZAKI MASAMI
(Kagawa Nutrition Univ., Inst. Nurtrition Sci., JPN)
SATO KYOKO
(SRL, Inc., JPN)
YOSHIOKA SHIN'ICHI
(SRL, Inc., JPN)
SUGAHARA TATSUYUKI
(Seitokudai Jimbun)
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Journal Title;Journal for the Integrated Study of Dietary Habits
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Journal Code:L3330A
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ISSN:1346-9770
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VOL.14;NO.2;PAGE.118-125(2003)
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| Figure&Table&Reference;FIG.2, TBL.8, REF.7 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;A total of 58 samples from eight food material groups were analyzed for nitrogen by a combustion method and Kjeldahl method. The Kjeldahl method yielded higher nitrogen values in grains, corms, and fruit. The combustion method yielded higher values in vegetables. A highly significant correlation at the correlation coefficient of r=0.9997 was observed between the nitrogen amounts of all the food materials determined by the combustion method and those by the Kjeldahl method. As for correlation coefficient by food material group, it was high at r=1.000 for corms and r=0.9997 for meat. It was a little low at r=o.9718 for vegetables but significant correlation was still observed. The amount of nitrogen in vegetables determined by subtracting nitrate nitrogen from that obtained by the combustion method was equal to that determined by the Kjeldahl method. The correlation coefficient was r=0.9577. The amounts of nitrogen in 20 commercially available box lunch determined by the combustion method were highly correlated with those determined by the Kjeldahl method. Correlation coefficient was r=0.9510 for all the box lunch, r=0.9256 for steamed rice, and r=0.9804 for bread and pasta. The mineral contents of the box lunch varied markedly by the kind of the food materials. The reliability of the combustion method was confirmed for the quantification of protein nitrogen in food materials and box lunch. Furthermore, the combustion method for nitrogen quantification is superior to the Kjeldahl method in safety and environmental pollution. Moreover, because it is relatively simple to operate, the combustion method for quantifying nitrogen in food can be judged to be an excellent method that can be adopted to replace Kjeldahl method. |
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