Stevioside (250 mg capsules) was given three times daily to 10 healthy subjects. Steviol glucuronide (steviol 19-O-β- d -glucopyranosiduronic acid; MM, 494.58; melting point, 198−199 °C) was characterized in the 24 h urine as the only excretion product of oral stevioside by MS, NMR, IR, and UV spectroscopy. This is the first report on the unambiguous identification of steviol glucuronide in human urine.
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Geuns et al. (2006) studied this question.
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