Abstract:

Fruits of 15 raspberry cultivars were used as materials to analyze the physical and chemical parameters, vitamin C,
crude protein, total phenolics and anthocyanins. Results showed that there were remarkable differences in hardness, fruit
juice rate, the contents of total soluble solids and titratable acids and ratio of sugars to acids among the tested raspberry
cultivars. Hardness ranged from 18.20 to 49.50 g, which exhibited the highest level in Meeker No. 2 cultivar and the lowest
level in Cuthbert. The total soluble solids contents ranged from 6.86% (Cuthbert) to 10.60% (FertodZamatos). The highest
sugar/acid ratio was found in Sunrise (7.42) and the lowest (1.75) in Willamette. In addition, notable differences in the
activities of polyphenol oxidase (PPO) and peroxidase (POD) and the color stability were also observed among these 15
raspberry cultivars. Among these raspberry cultivars, Cuthbert and Willamette exhibited the highest (10.60 mg/100 g) and
Willamette contained the lowest vitamin C content (6.86 mg/100 g). The crude protein contents were fluctuated in the range
from 0.70 to 1.49 g/100 g. The total phenolic contents varied from 1.41 to 3.44 g/100 g. The anthocyanins contents ranged
from 72.35 to 393.88 mg/100 g. It was preliminarily evaluated that the first category consisting of Rideau and Meeker No. 2,
1 was suitable for processing fruit juice or fruit wine products; Zeva Remontant, Nova were suitable for processing canned
raspberry products; Suitable for processing dried fruit products were Willamette, Omet, Festival and Sunrise assigned to the
second category. The comprehensive qualities of Rideau, Meeker No. 1, Meeker No. 2, Willamette, Sunrise and Nova were
better, and these six cultivars were suitable for further breeding of new raspberry varieties and deep processing.

Key words: raspberry, cultivars, physical and chemical indicators, processing characteristics