PROTEIN GUIDE Part 3 - Protein measurement method

Im third part our Serie Protein Guide let's focus on that Measurement method to assess protein quality.

The biochemists put some effort into classifying molecular compounds and measuring just protein as a nutrient that has received a lot of attention. The following terms are particularly common in biochemistry and nutrition journals. They are also often used, especially as abbreviations, by the supplement manufacturers to denote their Proteinprodukte appear particularly interesting.

Known measurement methods for proteins include

• PEV (protein efficiency ratio)
• NPU (Netto Protein Usage)
• BW (biological value)
• PDCAAS (Protein Digestibility Corrected Amino Acid Score)

PEV (protein efficiency ratio)

Obsolete method of measuring the quality of a protein based on the Growth of young ratswho received different protein combinations. The Non-Protein with a PEV of 2.5 was initially considered an excellent standard for comparing other proteins. Later resolved Kasein with a PEV of 3.0 the egg protein as a comparison base. However, the PEV-Method too much emphasis on the importance of methionine, one essential amino acid. Methionine promotes hair growth in rats - which doesn't mean too much to most people.

NPU (Netto-Protein-Use)

Ein weiteres überholtes und selten angewandtes Verfahren zur Bestimmung des Werts von Proteinen. Im Prinzip handelt es sich um die für den Körper ver­fügbare Menge an Protein, basie­rend auf Verdau­lichkeit und Amino acid constellation. A value of 100 means that every gram of protein is converted into lean tissue. The highest NPU value has egg protein at 94.

BW (biological value)

This term, also slightly outdated, is still used used. Here the protein is rated according to the amount of nitrogen that is left after Absorption remains in the body. The highest value is 100, although some Advertise supplements manufacturers with values ​​of 102 or 104. Will be here too Eggs used as the basis for the comparison.

PDCAAS (Protein Digestibility Corrected Amino Acid Score)

The most reliable rating system is hidden behind this long term. The highest value is 1.0. This means that the protein provides 100 percent of the amino acids required after digestion. Achieve in this system Soja-Protein-Isolate, Eiklar, Whey Protein Isolate und Kasein-Supplemente all have a value of 1.0. In contrast, beef is 0.92 and beans are 0.68.

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