The procedure determines nitrogen and proteins in organic material. With the Kjeldahl process, the boiling point of sulfuric acid of 337 degrees Celsius is increased with the aid of catalysts. About 380 degrees is the optimum digestion temperature for organic material in sulfuric acid. The protein content is determined by multiplying the analytically determined nitrogen content with factor 6.25, for wheat, and flour with factor 5.7. With the Kjeldahl process, the nitrogen content is determined in 4 stages.

Making coffee is also an extraction process. But in the lab, this involves separating the searched components as fully as possible from the sample, under defined conditions and not unnecessarily diluted. In the lab, organic solvents such as hexane or petroleum spirit are often used as extractants. What all extraction processes have in common is that as many components as possible are to be separated with a defined quantity of solvent. This can be achieved by constantly evaporating the solvent and having it drip into the samples from a reflux cooler. Unlike the coffee machine, the same solvent is continuously sent back through the sample. The extracted component enriches itself in the distillation flask.

Fibers are an important element of human nutrition and are directly connected with the natural components of foodstuff. Basically, the term refers to a group of fundamental food components that enter the stomach and small intestines undigested and reach the colon nearly unaltered. Fibers are comprised of indigestible plant parts and consist mainly of various types of starch-free polysaccharides (NSP) and lignin.

Crude fiber is the portion of feed, which remains after treatment with acids, alkalies and solvents as indigestible constituent. The main component of crude fiber is cellulose.

behrotest distillation under reflux enables very long heating for reaction during constant recovery of the evaporated solvent by means of condensation. The most frequent applications are acid digestion and synthesis.

behrotest distillation under reflux enables very long heating for reaction during constant recovery of the evaporated solvent by means of condensation. The most frequent applications are acid digestions and synthesis.

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