Although ginkgo is commonly used as an alternative treatment for memory loss, Alzheimer's dementia and peripheral circulatory disturbances, it is also known to cause neuronal symptoms due to ginkgotoxin (4'-methoxypyridoxine or B6 antivitamin). We experienced a case of a 51-year-old female patient
alpha 4-O-Benzoyl-pyridoxine (PN-4'MB) and alpha 5-O-benzoyl-pyridoxine (PN-5'MB) were hydrolyzed in 10% aqueous solution of acetone at pH 1-4. They were hydrolyzed obeying apparent first-order kinetics. In the pH range of 1-7, PN-4'MB was hydrolyzed 10 times faster than PN-5'-MB. At pH 7-12, an
4'-Substituted pyridoxine analogues (4'-PN analogues), which were potent antagonists of vitamin B6, induced severe convulsions in mouse which could be prevented by vitamin B6. To elucidate the mechanism of the convulsive action, the effect of 4'-PN analogues on partially purified pyridoxal kinase
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