Bioactive peptide fractions are specific protein fragments that can have a positive impact on the body's condition and function, ultimately influencing health by modulating physiological processes [Gómez-Guillén et al 2011]. They usually consist of 2 to 20 amino acids per molecule. This corresponds to a molecular weight of approximately 0.2 to 6.2 kDa*. As long as they are integrated into the protein, they do not exhibit these properties, meaning they must first be released. This occurs either naturally in the gastrointestinal tract through digestion, bacterial fermentation, or through targeted production.
Furthermore, they must be absorbed by the body and transported to the corresponding site of action.
For example, it is known that milk or whey proteins contain peptides that can influence the physiological processes of the immune system, cardiovascular system, and nervous system. However, peptides derived from other foods are also the subject of intensive research, such as peptides obtained from collagen structures.
Collagen is the most important structural protein in the body of vertebrates, making up 25 – 35% of the total protein content. Due to their widespread distribution, structural and biological properties, collagen peptides are biocompatible and safe [Fu et al 2018]. Since bioactive peptides are also formed through natural processes, humans have been accustomed to them since ancient times. Bioactive collagen peptides are attributed with blood pressure-lowering, antidiabetic, antioxidative, and health-promoting effects on bones, joints, and skin [Fu et al 2018]. Collagen peptides represent a promising area of research, but their potential still needs to be confirmed in clinical studies.
On my website, I strive to keep the information up to date. At the end of each chapter, you will find the last update status. References can be found under Overview of Literature Sources.
* kDa = Kilodalton, 1 kDa = 1,000 Daltons / atomic mass unit
The following illustration shows the process of protein biosynthesis


