Valleproteinisolat

What is Whey Protein Isolate?

Whey proteins are extracted from whey, which is the liquid portion of milk obtained during the manufacturing of cheese. It is removed and purified through the use of various techniques. Membrane filtration and ion exchange are the two most used.

Membrane filtration is the process by which whey is passed through a semipermeable membrane that retains the proteins but allows the passage of other compounds. The pore size of the membrane determines whether it is a process of microfiltration or ultrafiltration. Ion exchange is a chemical method that takes advantage of the electrical charge of proteins to separate them from carbohydrates and fats.

Purity and concentration of the final product are determined by how much whey proteins are filtered through these processes. When it comes to whey protein isolate, it is further filtered than whey protein concentrate, meaning it has a higher protein concentration (over 90%) and very few carbohydrates and fats.

Main benefits of Whey Protein Isolate:

  • High protein concentration with minimal sugars and fats
  • Complete essential amino acid profile, being particularly rich in branched-chain amino acids
  • Source of amino acids, essential for muscle synthesis
  • Source of bioactive peptides, responsible for several biological activities

Referencer

Churchward-Venne T.A. et al, Supplementation of a suboptimal protein dose with leucine or essential amino acids: effects on myofibrillar protein synthesis at rest and following resistance exercise in men. The Journal of Physiology. 2012;590(11):2751-2765. doi:10.1113/jphysiol.2012.228833.

Devries MC, Phillips SM. Supplemental protein in support of muscle mass and health: advantage whey. Journal of Food Science. 2015;80(S1). doi:10.1111/1750-3841.12802.

Garrido, B.C. et al., Proteomics in quality control: Whey protein-based supplements. Journal of Proteomics. 2016;147:48-55. doi:10.1016/j.jprot.2016.03.044.

Hulmi J.J. et al, Resistance exercise with whey protein ingestion affects mTOR signaling pathway and myostatin in men. Journal of Applied Physiology. 2009;106(5):1720-1729. doi:10.1152/japplphysiol.00087.2009.

Norton, L. E., et al., Leucine content of dietary proteins is a determinant of postprandial skeletal muscle protein synthesis in adult rats. Nutrition & Metabolism. 2012;9(1):67. doi:10.1186/1743-7075-9-67.

Pereira, C. G. et al., Characterization and detection of adulterated whey protein supplements using stationary and time-resolved fluorescence spectroscopy. Lwt. 2018;97:180-186. doi:10.1016/j.lwt.2018.06.050.

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