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Preservation of quality indicators of wild strawberries during treatment with chitosan

Food wastes reducing, as well as non-invasive methods to extend the shelf life of perishable fruits, are important global challenges for scientists and entrepreneurs. With Ukrainian producers entering to foreign markets, the relevance of the topic of high-quality storage of fruit and vegetable products takes on special importance. The higher the yield and the number of berry crops grown by our farmers, the more challenges there are regarding the processing, storage and logistics of the harvested crops. In practice, it is difficult to provide optimal conditions for preserving quality, freshness, taste, aroma, and appearance due to the delicacy and capriciousness of products. Garden strawberry (Fragaria ananassa) is a highly nutritious and economically important berry crop with a short shelf life. This is a seasonal berry that is on the market for only a few months. During mass harvesting period strawberries is the leader in the number of losses among all berry crops due to its physiological characteristics. This paper proposes the use of chitosan to extend the shelf life of strawberries. The effect of are-treatment with chitosan solutions of different concentrations was studied. To assess the impact of are-treatment on quality indicators of strawberries the research was conducted every third day of storage, determining weight loss; m.h. SRR; m.h. organic acids; m.h. of sugars. Strawberrries were treated with chitosan solutions of three concentrations (0.1; 0.2; 0.3 %) by full immersion for 1 min. The treated berries were left until completely dry. Dry treated berries and the control ones were weighed and placed in perforated plastic containers with a capacity of 500 g and stored in a refrigerator at a temperature of 0+2 o C. Berries without treatment were considered as control. Strawberries of the «Dukat» variety grown in 2022–2023 accumulated an average of 10.4 % of dry soluble substances and 1.1 % of organic acids. It was found that the post-harvest treatment of strawberries with a chitosan solution ensured their highest preservation compared to the control, which proves the effectiveness of its application. Pre-treatment of strawberries with a chitosan solution slowed down the loss of dry soluble substances by 0.2–0.9 %, and organic acids by 0.04–0.12 % of the control.

Key words: garden strawberries, chitosan, storage, pre-treatment, quality indicators, berries.

 

Blahopoluchna A. https://orcid.org/0000-0001-5897-0120


Liakhovska N.


Zadorozhna О.


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2023
AGROBIOLOGY №2 2023