Primocane raspberry for freezing and dessert
2022
StrautinaStrautiņa, Sarmīte, Sarmite | Laugale, Valda | KalninaKalniņa, Ieva, Ieva | Krasnova, Inta
Growers’ interest is increasing in primocane raspberries in Latvia, because their cultivation is relatively easier than cultivation of summer raspberries. Primocane raspberries are usually used for fresh consumption, however, it has become difficult to sell all the fruits as fresh with increased production volumes. One of the solutions to prolong the storage time is to freeze them. The use of frozen raspberries obtained by the quick-freezing method for dessert is rather underused in Latvia, and there is a lack of information about cultivar suitability for it therefore research activities were initiated at the Institute of Horticulture (LatHort) within the framework of the collaboration project “Innovative, economically justified solutions for increasing the efficiency and quality of apple and raspberry production” (No. 18-00-A01620-000025). In the project, the evaluation of fruit quality for both fresh and frozen fruits was carried out by performing sensory evaluation and chemical analysis. Three primocane raspberry cultivars: ‘Polana’, ‘Polka’ and ‘Polonez’ were evaluated. In 2020, ‘Polonez’ had the largest and most attractive fruits among the evaluated cultivars. This cultivar also had the highest average sensory rating of both fresh and frozen fruits. After freezing, the firmness of fruits decreased twice on average compared to fresh fruits. The increase of total amount of phenols was observed for all cultivars during the frozen fruit storage. ‘Polka’ and ‘Polonez’ had also an increased amount of soluble solids in fruits. At the end of storage the ‘Polana’ had the darkest fruit colour and the ‘Polonez’ had the lightest colour.
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