Journal
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Volume 91, Issue 4, Pages 658-663Publisher
WILEY-BLACKWELL
DOI: 10.1002/jsfa.4228
Keywords
isoflavone aglycone; fermented soybeans; bioavailability; postmenopausal women
Ask authors/readers for more resources
BACKGROUND: There have been conflicting study results concerning how the food matrix affects the bioavailability of isoflavone aglycone and glucoside. In this study the bioavailability of isoflavones after a single ingestion of aglycone-rich fermented soybeans (Fsoy) and glucoside-rich non-fermented soybeans (Soy) was compared. Eleven healthy postmenopausal Japanese women were recruited for a randomised, double-blind, crossover trial and consumed Fsoy or Soy powder dissolved in hot water. Blood samples were collected 0, 1, 2, 3, 4, 6, 8, 12 and 24 h and urine samples from 0 to 48 h after ingestion of the powders. The Fsoy and Soy powders ingested had the same total isoflavone content (95 mu mol), but the former was rich in aglycone (90.6 mu mol) while the latter was rich in glucoside (81.9 mu mol). RESULTS: Serum concentrations of total isoflavones after 1-4 h were significantly higher in the Fsoy group than in the Soy group. The Fsoy group showed significantly higher maximum concentration (Cmax: 2.79 +/- 0.13 vs 1.74 +/- 0.13 mu mol L(-1)) and area under the curve (AUC(0-24 h): 23.78 +/- 2.41 vs 19.95 +/- 2.03 mu mol day L(-1)) and lower maximum concentration time (Tmax: 1.00 +/- 0.00 vs 5.00 +/- 0.67 h) compared with the Soy group. The cumulative urinary excretion of total isoflavones after 2 h was significantly higher in the Fsoy group than in the Soy group. Individual isoflavones (daidzein, genistein and glycitein) showed similar trends to total isoflavones. Equol (a metabolite from daidzein) did not differ between the two groups. CONCLUSION: The results of this study demonstrated that the isoflavones of aglycone-rich Fsoy were absorbed faster and in greater amounts than those of glucoside-rich Soy in postmenopausal Japanese women. (C) 2010 Society of Chemical Industry
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available