FOOD. Science. Technology. Quality

Food. SCIENCE. Technology. Quality

Food. Science. TECHNOLOGY. Quality

Food. Science. Technology. QUALITY




Polyphenolic composition of Rubus fruticosus blackberry fruits


The objective of the study was to determine the polyphenolic composition of six blackberry cultivars, including the prevalently used Orkan and Gaj, and of four novel cultivars: Ruczaj, Polar, Brzezina, and Leśniczanka, as well as to determine the variability of main groups of polyphenols contained therein. Fruits of the above named cultivars constituted the research material; they were acquired from a Sadowniczy Zakład Doświadczalny Instytut Ogrodnictwa in Brzezna (Experimental Station for Fruit Growing, Institute of Horticulture in Brzezna, Poland). In the fruits, the basic groups of polyphenols were determined using a HPLC method: anthocyanins, ellagitannins, and flavan-3-ols. It was found that the contents of those polyphenols in blackberries were as follows: anthocyanins between 210 and 465 mg/100 g FW, ellagitannins between 53 and 320 mg/100 g FW, and flavan-3-ols between 121 – 282 mg/100 g FW; the total polyphenols were between 556 and 898 mg/100 g FW. The fruits of the Ruczaj cultivar were characterized by a significantly higher amount of anthocyanins (465 mg/100 g FW) and the Polar blackberries by a significantly lower amount of anthocyanins (210 mg/100 g FW.); however, the latter cultivar was characterized by a significantly higher amount of ellagitannins (319 mg/100 g FW). In the fruits of all the cultivars, cyanidin-3-O-glucoside was the main anthocyanin (79 – 91 % of total anthocyanins). In the blackberry fruits, the total contents of two ellagitannins: lambertianin C and sanguiin H-6, and their reciprocal percent contents were significantly different depending on the type of cultivar; thus, they could be considered to be a criterion for similarity. A high content of total polyphenols in the Ruczaj, Polar, and Gaj cultivars could be a further factor when popularizing the cultivation of those cultivars.


blackberries, cultivar variability, ellagitannins, anthocyanins, flavan-3-ols