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Strawberry Consumption Is Associated with Increased Antioxidant Capacity in Serum
Susanne M. Henning,Navindra P. Seeram,Yanjun Zhang,,Kun Gao,Ru-Po Lee,David C. Wang,Alona Zerlin,Hannah Karp,Gail Thames,Jenny Kotlerman,Zhaoping Li,David Heber 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.1
Strawberries are known to contain antioxidants, but the significance of ingesting antioxidant-rich fruits remains to be established. In order to determine whether the consumption of strawberries impacted measures of in vivo antioxidant capacity, frozen strawberries (250g) were administered daily for 3 weeks to 21 healthy female volunteers. Compliance was confirmed by quantitating pelargonidin-glucuronide, urolithin A-glucuronide, and 2,5-dimethyl-4-hydroxy-3-[2H]furanone-glucuronide in plasma and urine by liquid chromatography–mass spectrometry and antioxidant capacity in serum measured by the increase in lag phase of low-density lipoprotein after copper sulfate exposure, DNA strand breaks in lymphocytes, and activity of phase II enzymes. Among these measures lipid peroxidation lag time increased by 20% (P<.01), whereas other measures did not change significantly. The potent antioxidant defenses in humans make determination of changes due to dietary ingestion in healthy individuals difficult. In summary, daily consumption of strawberries resulted in a modest but significant increase in antioxidant capacity in a healthy population.
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Navindra P. Seeram,Yanjun Zhang,Rodney McKeever,Susanne M. Henning,Ru-po Lee,Marc A. Suchard,Zhaoping Li,Steve Chen,Gail Thames,Alona Zerlin,Martha Nguyen,David Wang,Mark Dreher,David Heber 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.2
Pomegranate juice (PJ), a rich source of polyphenols including ellagitannins, has attracted much attention dueto its reported health benefits. This has resulted in the consumption of liquid and powder pomegranate extracts as alternativesto PJ. Therefore establishing the bioavailability of polyphenols from these extract preparations is necessary. Sixteen healthyvolunteers sequentially consumed, with a 1-week washout period between treatments, PJ (8 ounces, Wonderful fruit variety),a pomegranate polyphenol liquid extract (POMxl, 8 ounces), and a pomegranate polyphenol powder extract (POMxp, 1,000mg). The three interventions provided 857, 776, and 755 mg of polyphenols as gallic acid equivalents, respectively. Plasmabioavailability, judged based on ellagic acid levels over a 6-hour period, did not show statistical differences in area under thecurve for the three interventions: 0.14. 0.05, 0.11. 0.03, and 0.11. 0.04 .mol.hour/L for PJ, POMxl, and POMxp, re-spectively. The time of maximum concentration was delayed for POMxp (2.58. 0.42 hours) compared to PJ (0.65. 0.23hours) and POMxl (0.94. 0.06 hours). Urolithin-A glucuronide, a urinary metabolite of ellagic acid, was not significantlydifferent with the three interventions, reaching levels of approximately 1,000 ng/mL. This study demonstrates that ellagitan-nin metabolites, delivered from pomegranate fruits, as PJ, POMxl, and POMxp, reach equivalent levels with a delay in timeof maximum concentration of POMxp compared to PJ and POMxl.
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