PHYTOCHEMICAL AND FATTY ACID PROFILE OF SELECTED RED RASPBERRY CULTIVARS: A COMPARATIVE STUDY

ABSTRACT

Seven red raspberry cultivars (Heritage, Canby, Willamette, Hollanda Boduru, Newburgh, Tulameen and Meeker) were evaluated for their total anthocyanin (TACY), total phenolics (TP), trolox equivalent antioxidant capacity (TEAC), fatty acids (FAs) and soluble sugars properties. The TACY, TP and TEAC content ranged from 171.5 to 475.0 µg/g fresh weight (fw), 864.4–1246.9 µg gallic acid equivalent/g fw and 19.4–32.7 µmol TE/g fw, respectively. The highest values of TACY, TP and TEAC content were obtained from the Newburgh cultivar. The FA compositions of raspberry cultivars ranged from 4.97 to 20.31% saturated FAs, 14.65–18.47% monounsaturated FAs (MUFAs) and 62.85–78.68% polyunsaturated FAs (PUFAs). Cultivars Meeker and Newburgh had the highest level of MUFAs, respectively, while the highest level of PUFAs was observed in cultivar Hollanda Boduru. The main soluble sugars of the seven raspberry genotypes were also separated, identified and quantified using high‐performance liquid chromatography with refractive index detection. According to the results, fructose, glucose and sucrose were detected as the main soluble sugars, while xylose and mannose were not detected in the raspberry fruits.

PRACTICAL APPLICATIONS

There have been no previous studies comparing the fruit quality characteristics of raspberry cultivars. Raspberries may be a good alternative crop with a high market value, especially highly profitable due to the long harvesting period, because of the ideal climatic conditions. The objective of this work was to evaluate seven red raspberry cultivars in terms of their total anthocyanin, total phenolic, antioxidant capacity, fatty acids profile and soluble sugar properties.