Patent ID: 7531312

Claim:
A biological evaluation method of a natural or artificial chemical, comprising the steps of adding a known amount of 2′-deoxyguanosine to a solution containing a specific natural or artificial chemical and an antioxidative preservative solution comprising 0.5 to 2 mM/L of EDTA, 2 to 5 wt % of methanol and 10 to 40 wt % of glycerol, applying UV light to said solution, quantifying 8-hydroxy-2′-deoxyguanosine (8OHdG) and 2′-deoxyguanosine (dG) in said solution; and evaluating harmfulness or usefulness of said natural or artificial chemical based on a ratio (8OHdG/dG) of an amount of 8OHdG to an amount of dG.