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Cosmetic Peat Association
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Polysaccharides

Chemical Compounds
Also: sphagnan, peat polysaccharides, hemicellulose, cellulose, pectins
Molecular weight: Varies — 10,000 to 1,000,000+ Da
Solubility: Partially water-soluble
Concentration in peat: 5–15% of dry mass, decreasing with humification

Polysaccharides in peat derive from the cell walls and storage compounds of the original bog plants. They include cellulose, hemicellulose, sphagnan (a pectin-like polysaccharide unique to sphagnum), and various degradation products. Their concentration decreases as peat ages and humification progresses.

Sphagnan

Sphagnan is a pectin-like polysaccharide unique to sphagnum moss with documented antimicrobial and wound-healing properties. It contributes to the preservative environment of peat bogs and is one of the reasons sphagnum was historically used in wound dressings.

Cosmetic Relevance

Polysaccharides contribute moisture-retention properties to peat applications. Their hygroscopic nature helps attract and hold water on the skin surface, complementing the occlusive effects of the lipid fraction. In less decomposed peat, the polysaccharide content is higher, making younger peat potentially more moisturizing.

Evidence & Claims

exhibits moisturizing (moderate)

Hygroscopic polysaccharides attract and retain water on skin surface

korhonen-2008 — Finnish peat hemicellulose 11.8-17%, pectins 2.5-5.9% — hygroscopic polysaccharide fractions
exhibits wound-healing (preliminary)

Sphagnum polysaccharides (sphagnan) may stimulate fibroblast activity and inhibit bacteria

painter-1991 — Historical review: sphagnum moss wound dressings — polysaccharide absorbency and antimicrobial contribution
decker-2020 — Sphagnum species produce unique metabolites including antimicrobial polysaccharides