Cranberry Juice and Combinations of Its Organic Acids Are Effective against Experimental Urinary Tract Infection

Area of Science:

• Urology
• Microbiology
• Natural Products Chemistry

Background:

• Urinary tract infections (UTIs) are commonly caused by uropathogenic Escherichia coli.
• Cranberry juice is a popular folk remedy for UTIs, but its efficacy and active components are not fully understood.

Purpose of the Study:

• To investigate the antibacterial effects of cranberry juice and its constituent organic acids against uropathogenic E. coli in a mouse model of UTI.
• To identify specific organic acid combinations responsible for the observed antibacterial activity.

Main Methods:

• An experimental mouse model of urinary tract infection (UTI) was established.
• Mice were administered fresh cranberry juice, commercial cranberry juice cocktail, cranberry juice hydrophilic fraction, or combinations/individual organic acids (quinic, malic, shikimic, citric).
• Bacterial counts in the bladder were quantified to assess treatment efficacy.

Main Results:

• Fresh cranberry juice, commercial cranberry juice cocktail, and the hydrophilic fraction significantly reduced E. coli bladder counts.
• A combination of all four tested organic acids, as well as malic acid with citric acid or malic acid with quinic acid, demonstrated significant antibacterial effects.
• Individual organic acids or other combinations did not show significant efficacy.

Conclusions:

• Cranberry juice possesses antibacterial properties against uropathogenic E. coli in a UTI model.
• The antibacterial effect is attributed, in part, to specific organic acids, particularly combinations of malic acid with citric or quinic acid.
• This study provides evidence for the efficacy of cranberry-derived compounds in combating E. coli UTIs.