Anti-adhesive polysaccharide chains block the progress of pathogens

Anti-adhesion strategies to block infection

Anti-adhesive strategies are aimed at blocking the initial binding of microbes to human skin and mucosal tissues, to prevent infection in an early stage. Anti-adhesive therapies do not affect the viability of microbes and do not destroy the healthy microbiota. Another advantage of this mode of action is the absence of selective pressure, which minimizes the risk of developing microbial resistance. Therefore, anti-adhesive agents can offer an interesting alternative approach  to antibiotic treatment of common health problems related to skin and mucosal microbial infections.

The human mucus layer uses anti-adhesion polysaccharides to prevent microbes binding to host tissues

The mucus layer that covers human epithelial surfaces is well-known for its natural anti-adhesion activity to prevent binding of microbes to the underlying epithelial cells. Our mucosal surfaces are a humid and warm environment that supports microbial growth. The digestive tract, the vagina and the mouth all contain extensive microbiota. To minimize direct contact with microbes, mucosal epithelial cells produce mucus that contains anti-adhesive polysaccharides. These polysaccharides trap microbes and prevent them from reaching the epithelial surface.

Natural polysaccharide anti-adhesion strategies

Polysaccharides from several natural sources are known for their anti-adhesion activity, with a mode of action similar to that described above for mucins. The protective effect of anti-adhesive polysaccharides has been demonstrated convincingly in a variety of in vitro studies and in vivo models with different pathogenic microbes. Therefore, anti-adhesive strategies offer a very promising, novel,  anti-microbial approach to be used as alternatives to antibiotics.

2QR-complex anti-adhesive mode of action

The negatively charged polysaccharide chains refined from the Aloe Vera Barbadensis leaf gel revealed an anti-adhesive mode of action.  From this discovery, BioClin developed 2QR-complex: our innovative, patented ingredient. 2QR-complex has a broad spectrum of efficacy and does not damage the host’s tissues or the healthy balance of the microbiota.

2QR-complex prevents adhesion of pathogens and restores the healthy microbiota

• Microbes use adhesins to bind to polysaccharide structures on receptors of human cells.
• Polysaccharides with structures similar to those of human cells can bind to microbes, and act as decoy to block interaction of harmful microbes with human cells.
• In collaboration between BioClin and the Free University in Amsterdam, the 2QR-complex was identified as a natural and safe anti-adhesion polysaccharide fraction derived from gel of Aloe Barbadensis leaves.
• The high diversity of polysaccharide structures in the patented 2QR-complex results in excellent anti-adhesion activity against many harmful microbial pathogens 1.
• 2QR-complex blocks the adhesion of pathogenic microbes to human tissues but does not affect the growth of beneficial commensal microbes 2.Therefore, 2QR-complex treats and prevents binding of harmful microbes to human tissues and creates a situation with competitive advantage for commensals and corrects and restores the healthy microbiota.
• 2QR-complex is harmless for human cells and tissues; it does not exert any chemical, metabolic or immunological response in the host tissues 3–5.

1. Van Dijk, W., Goedbloed, A. F. & Koumans, F. J. R. Negatively charged polysaccharide derivable from Aloe Vera. Publication Date:29.09.2004Filing Date:23.12.2002. EP1461361. 1, 1–24 (2002).
2. Kwakman, P. H. S. 2QR-complex polysaccharides do not affect microbial viability. Document on file. (2015).
3. Celi, P. Method of fractionation of Aloe vera extract on basis of molecular weight and charge: Biological activity of the different fractions. Document on file.(2000).
4. Van Dijk, W., Goedbloed, A. F. & Koumans, F. J. R. Negatively charged polysaccharide derivable form Aloe Vera. Freepatentsonline: EP20010205253Publication Date:07/02/2003 Filing Date:12/27/2001. (2001).
5. Van Dijk, W. Further characterization of negatively charged polysaccharides isolated from concentrated Aloe vera gel with regard to antibacterial properties and molecular structure. Document on file. (2006).