Abstract
Twenty-one cultivars of cranberry fruits (Vaccinium macrocarpon) grown in New Zealand were analysed for their physico-chemical characteristics including average fruit weight, total soluble solids content, pH, total titratable acidity, organic acids, and total anthocyanins. In addition, the total proanthocyanidin contents of the fruit were determined using 4-dimethylaminocinnamaldehyde assay, and the profiles were characterised using matrix-assisted laser desorption/ionization time of flight mass spectra. Between the different cultivars, there was a range of average fruit weight (0.75–1.84g), total soluble solids content (9.7–12.8%), juice pH (2.61–2.86), total titratable acidity (3.74–8.77g citric acid/L juice) and total anthocyanin content (1.63–2.87mg cyanidin-3-glucoside/g dry weight). The 21 cranberry cultivars exhibited similar high performance liquid chromatography profiles for proanthocyanidins using a diol column. The cultivars of Crowley and Howes with the higher contents were found to contain mainly A type (epi)catechin extending units. Therefore, Crowley and Howes with high proanthocyanidin contents would be the best choice of the cultivars studied for the promotion of urinary tract health.
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