The Kjeldahl method estimates protein content by measuring which element?

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Multiple Choice

The Kjeldahl method estimates protein content by measuring which element?

Explanation:
Total nitrogen is quantified by the Kjeldahl method. The reason this relates to protein content is that proteins are the main nitrogen-containing components in most foods and tissues, containing about 16% nitrogen by weight. After digesting the sample with sulfuric acid, nitrogen is converted to ammonium, which is then distilled and titrated to determine how much nitrogen was present. That nitrogen value is converted to protein using a factor (often 6.25). Because the method measures nitrogen directly, not carbon, hydrogen, or oxygen, it provides an estimate of protein content based on the nitrogen amount.

Total nitrogen is quantified by the Kjeldahl method. The reason this relates to protein content is that proteins are the main nitrogen-containing components in most foods and tissues, containing about 16% nitrogen by weight. After digesting the sample with sulfuric acid, nitrogen is converted to ammonium, which is then distilled and titrated to determine how much nitrogen was present. That nitrogen value is converted to protein using a factor (often 6.25). Because the method measures nitrogen directly, not carbon, hydrogen, or oxygen, it provides an estimate of protein content based on the nitrogen amount.

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