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APHANOTHECE SACRUM POLYSACCHARIDES

88

Safety score · 0–100

Good

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A silky polysaccharide from the blue-green algae Aphanothece sacrum — forms a smooth, protective film on skin that locks in moisture while letting it breathe.

Aphanothece sacrum polysaccharides are sulfated heteropolysaccharides isolated from Aphanothece sacrum, a species of cyanobacteria (blue-green alga) historically consumed as a traditional food in Japan known as 'OKIENTO'. The polysaccharide fraction consists of repeating units of sulfated glucuronic acid, rhamnose, and xylose with molecular weights typically in the range of 10-100 kDa. The sulfate groups (O-sulfate esters) give the molecule a high negative charge density, enabling strong hydration through hydrogen bonding with water molecules. On skin, this creates a hydrophilic film that reduces transepidermal water loss (TEWL) while allowing normal perspiration. The uronic acid residues provide some ionic interaction with the stratum corneum, enhancing substantivity and a smooth after-feel.

Function

CHELATING, EMULSION STABILISING, FILM FORMING, HUMECTANT, SKIN PROTECTING, VISCOSITY CONTROLLING, DISPERSING NON-SURFACTANT, SLIP MODIFIER, SKIN CONDITIONING - HUMECTANT

Skin benefits

  • Excellent humectant — binds and retains water in the skin
  • Film-forming creates a protective moisture barrier
  • Reduces transepidermal water loss
  • Provides smooth, silky sensory feel
  • May support skin elasticity

Known concerns

  • Sulfated polysaccharides may be sensitizing in individuals with algae or cyanobacteria allergies
  • Blue-green algae may produce microcystins if improperly sourced — quality control is essential

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.