The only antiviral compound from Spirulina that has been patented is the antiviral polysaccharide purified from S. platensis by Hayashi et al. 199612. The US Patent 5585365 was issued on December 17, 1996, and claims that this polysaccharide has a molecular weight of 250,000-300,000 Da, contains rhamnose, glucose, fructose, ribose, galactose, xylose, mannose, glucuronic acid, and galacturonic acid, which can be used as a method for prophylactic or therapeutic treatment of viral diseases, produced by HIV, HSV, HCMV, measles virus, mumps virus, and influenza virus.
The Spirulina polysaccharide can be used as an ingredient of antiviral pharmaceutical compositions (liquid, powders, capsules), in foods or drinks like chocolate, tea, biscuits, hamburgers, and others alike. It is recommended to administrate orally the polysaccharide for humans, and animals such as domestic animals: cattles, pigs, sheeps, goats, and pets like dogs, cats, at a dose of about 5-200 mg/kg weight per day, depending on general conditions, severity of the diseases among other factors.
It is worth to say that until now, there are not any published results about human or animal trials showing the antiviral prophylactic or therapeutic efficacy of this polysaccharide.
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