Study on the Pharmacokinetics of Synthetic Genistein after Multiple Oral Intake in Post-menopausal Women

Abstract

Genistein (CAS 446-72-0), an isoflavone and phytoestrogen predominantly found in soy, is considered a promising natural bioactive to prevent post-menopausal bone loss.

geniVida™ (previously Bonistein®), a novel product containing of min. 98.5% synthetic genistein aglycone, was investigated in 12 healthy post-menopausal women to assess the safety and tolerabil-ity as well as to obtain pharmacokinetic data after 7 days of repeated intakes. 24 h pharmacokinetic profiles were determined after the first oral dose and after 7 days repeated intakes of 30 mg of the test formulation. Plasma genistein (aglycone) and its conjugates were determined by a standardised LC/MS analytical method using D⁴-genistein as the internal standard.

The plasma-concentration time profiles for conjugated genistein showed a fast, monophasic one-peak course until T_max (5.9 h (first dose), 5.3 h (steady state (SS)); C_max (456.8 ng/ml (first dose), 498.5 ng/ml (SS)). Elimination half-lives (t_1/2) were calculated to be 10.8 h (first dose) and 8.2 h (SS), respectively. Determination of AUC_(0–inf.) (first dose) was good with a low percentage of extrapolation (3 949.1 h ng/ml). AUC_(0–24h) at SS was 5 923.3 h ng/ml. Steady state was reached after 4 to 5 days and no relevant accumulation occurred (R = 1.02).

The test formulation was safe and very well tolerated.

Key words

Bonistein® - CAS 446-72-0 - geniVida™ - Isoflavone - Pharmacokinetics - Phytoestrogen - Safety - Soy

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