Biosafety, antioxidant status, and metabolites in urine after consumption of dried cranberry juice in healthy women: a pilot double-blind placebo-controlled trial.
This study assessed the effect of an 8 week consumption of dried cranberry juice (DCJ) on 65 healthy young women. Basic biochemical and hematological parameters, antioxidant status, presence of metabolites in urine, and urine ex vivo antiadherence activity were determined throughout the trial. A 400 mg amount of DCJ/day had no influence on any parameter tested. A 1200 mg amount of DCJ/day resulted in a statistically significant decrease in serum levels of advanced oxidation protein products. This specific protective effect against oxidative damage of proteins is described here for the first time. Urine samples had an inhibitory effect on the adhesion of uropathogenic Escherichia coli strains, but no increase in urine acidity was noted. Hippuric acid, isomers of salicyluric and dihydroxybenzoic acids, and quercetin glucuronide were identified as the main metabolites. In conclusion, cranberry fruits are effective not only in the prevention of urinary tract infection but also for the prevention of oxidative stress.
Valentova
Katerina
K
Departments of Medical Chemistry and Biochemistry and Microbiology, Faculty of Medicine and Dentistry, Palacký University, HnevotínskA 3, CZ-77515 Olomouc, Czech Republic. kata.valentova@email.cz
Stejskal
David
D
Bednar
Petr
P
Vostalova
Jitka
J
Cíhalík
Cestmír
C
Vecerova
Renata
R
Koukalova
Dagmar
D
Kolar
Milan
M
Reichenbach
Richard
R
Sknouril
Lucyna
L
Ulrichova
Jitka
J
Simanek
Vilím
V
D000328:Adult; D000975:Antioxidants / Q000032:analysis*; D001422:Bacterial Adhesion / Q000187:drug effects; D001628:Beverages / Q000032:analysis*; D004311:Double-Blind Method; D004926:Escherichia coli / Q000187:drug effects; D005260:Female; D005519:Food Preservation; D005638:Fruit / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D018384:Oxidative Stress; D010865:Pilot Projects; D010919:Placebos; D014552:Urinary Tract Infections / Q000517:prevention & control; D014556:Urine / Q000737:chemistry*; D029799:Vaccinium macrocarpon / Q000737:chemistry*
D000975:Antioxidants; D010919:Placebos