NUTR 3210 Lecture Notes - Lecture 3: Dietary Fiber, Victorian Football League, Distillation
15 Sep 2016
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Also does not specify types of fatty acids: gas chromatography is a modern improvement that can be used. The ash is weighed, and it represents the mineral content, or inorganic portion of the sample: problem: some volatile minerals are lost during the burning. Individual minerals are not quantified, just the total amount of minerals: ash is now followed by acid solubilisation and further analysis of specific minerals by atomic absorption spectroscopy. Digestion with sulphuric acid, converting all nitrogen into ammonia (nh3) Distillation of the ammonia, which is then quantified. Multiply grams of nitrogen by 6. 25 to get grams of protein: problems: nitrogen is also liberated from other components such as dna or. 16% nitrogen, but it is really 13-19%, so accurate conversion factors vary from 5. 3-7. 7: this method is still in use! What is fibre: non-digestible complex carbohydrate (cho, structural part of plants, insoluble: do not dissolve in water, but colonic bacteria do have enzymes to attack bonds.
