Antioxidant Activity and Phenolic Content of Oregon Caneberries

Abstract

Five types of caneberries [evergreen blackberries (Rubus laciniatus), marionberries (Rubus ursinus), boysenberries (Rubus ursinus x idaeus), red raspberries (Rubus idaeus), and black raspberries (Rubus occidentalis)] were analyzed for antioxidant activity by measuring their oxygen radical absorbance capacity (ORAC). In addition, the berries were analyzed for total phenolics, anthocyanins, procyanidins, and ellagic acid content. All of the berries had high ORAC activity ranging from 24 to 77.2 micromol of Trolox equiv/g of fresh berries. Anthocyanin content ranged from 0.65 to 5.89 mg/g, and phenolics ranged from 4.95 to 9.8 mg/g. Black raspberries had the highest ORAC and anthocyanin and phenolic contents. Only red raspberries had detectable amounts of procyanidin oligomers (monomer, dimers, and trimers). All berries had high levels of ellagic acid (47-90 mg/g), but boysenberries had the highest level prior to hydrolysis. The results from this study indicate that these caneberries were high in antioxidant activity and were rich sources of anthocyanins and phenolics.

Antioxidant properties of fruits of raspberry and blackberry grown in central Europe

“…According to the literature sources, black raspberries contained the highest anthocyanin level among all berries [53]. However, the observed two-fold difference between mean values obtained for black raspberries and blackberries is remarkable as the colour of these fruits might suggest comparable anthocyanin contents.…”

Boysenberry Polyphenols Suppressed Elevation of Plasma Triglyceride Levels in Rats

“…1. Recent studies have indicated that orally administered boysenberry juice (BBJ) shows positive biological effects such as reduction of oxidative stress (9,10), prevention of liver injury (11) and anti-hypertension (12).…”

Production of phytochemicals by using habituated and long-term cultured cells

“…The extract was diluted with 0.1% (v/v) HCl-methanol, and the absorbance was measured at 530 nm using a spectrophotometer (U-1500, Hitachi Ltd., Tokyo). The anthocyanin content was calculated approximately as cyanidin 3-O-b-D-glucoside chloride (cyanidin glucoside) by using a value of 29,600 as the molecular extinction coefficient (Wada and Ou 2002). The anthocyanins from the cell culture of Asiatic dayflower and from fresh blue petals of the plant were extracted by using 80% (v/v) methanol and analyzed by high-performance liquid chromatography (HPLC).…”