Prevention of Urinary Tract Infection with Oximacro®, A Cranberry Extract with a High Content of A-Type Proanthocyanidins: A Pre-Clinical Double-Blind Controlled Study

Urinary tract infections (UTIs) are widespread and affect a large portion of the human population. Cranberry juices and extracts have been used for UTI prevention due to their content of bioactive proanthocyanidins (PACs), particularly of the A type (PAC-A). Controversial clinical results obtained with cranberry are often due to a lack of precise determination and authentication of the PAC-A content. This study used Oximacro® (Biosfered S.r.l., Turin, Italy), a cranberry extract with a high content of PAC-A, to prevent UTIs in female and male volunteers.
The Oximacro® PACs content was assayed using the Brunswick Laboratories 4-dimethylaminocinnamaldehyde (BL-DMAC) method, and the dimer and trimer PACs-A and PACs-B percentages were determined via high-performance liquid chromatography/electrospray ionization tandem mass spectrometry (HPLC/ESI-MS/MS). A balanced group of female (ranging from 19 to over 51 years) and male volunteers (over 51 years) was divided into two groups. The experimental group received 1 capsule containing Oximacro® (36 mg PACs-A) twice per day (morning and evening) for 7 days, and the placebo group was given the same number of capsules with no PACs.
Analysis of Oximacro® revealed a high total PAC content (372.34 mg/g ± 2.3) and a high percentage of PAC-A dimers and trimers (86.72% ± 1.65). After 7 days of Oximacro® administration, a significant difference was found between the placebo and Oximacro® groups for both females (Mann-Whitney U-test = 875; P Careful determination of the total PAC content using the BL-DMAC method and the authentication of PACs-A with mass spectrometry in cranberry extracts are necessary to prepare effective doses for UTI prevention. A dose of 112 mg Oximacro® containing 36 mg PACs-A was found to be effective in preventing UTIs when used twice per day for 7 days.