Volume: 3, 2024
3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: F009
DOI: https://doi.org/10.24326/ICDSUPL3.F009
Published online: 24 April 2024
ICDSUPL, 3, F009 (2024)
Effect of antioxidant biocomposites films on frozen stored raspberries
Marta Kotuła1*, Joanna Kapusta-Duch1, Barbara Borczak1, Kinga Dziadek1
1 Department of Human Nutrition and Dietetics, Faculty of Food Technology, University of Agriculture in Cracow, Mickiewicza 21, 31-120 Cracow, Poland
* Corresponding author: marta.kotula@urk.edu.pl
Abstract
Recently, functional food is becoming more and more interest among consumers. The use of polysaccharides increases the content of bioactive compounds by releasing active substances into food, in consequence which may consequently improve its durability and health quality. Poland has been producing significant amounts of raspberries for many years. In 2022, Poland took second place in terms of raspberry production among European Union countries. Raspberry fruits are seasonal and unstable. The water content in raspberries causes them to spoil faster, so they require quick technological processing after harvesting A properly performed freezing process reduces the possibility of unfavorable changes in the color, smell and taste of fruit. The aim of the research was to determine the effect of using biocomposites films based on chitosan and sodium alginate with natural turmeric extract on the increase in the antioxidant potential of raspberry fruit during frozen storage for 1-, 4-, 8- and 12-month periods. The research material consisted of raspberry fruits (Rubus idaeus L.) of the Polana variety from conventional crops, collected in 2020 at the harvest maturity stage. Raspberry fruits were packed in string bags (control sample) and with chitosan and sodium alginate films (base sample) along with turmeric extract (research sample) and stored at -22°C for 12 months. Stored raspberry fruits were analyzed for selected bioactive compounds (content of total polyphenols and anthocyanins, as well as antioxidant activity – using the ABTS˙+ and FRAP methods). The use of polysaccharide films with turmeric extract resulted in an increase in the content of total polyphenols (by 48%), antioxidant activity (ABTS by 31%, FRAP by 37%) in the first month of frozen storage, as well as anthocyanins (by 23%) and antioxidant activity (ABTS by 17% and FRAP by 24%) in the eighth month. In the 12th month of storage, only an increase in the anthocyanin content was observed – by 23% compared to the control sample. The application of biocomposites films based on chitosan and sodium alginate with the addition of turmeric extract resulted in a significant increase in the content of bioactive compounds in the first month of freezing storage compared to the control sample. The eighth month of frozen storage was characterized by an increase in antioxidant compounds in the base sample and research sample, in relation to the control, however, the base samples had a higher content.
Keywords: alginate, sodium, chitosan, turmeric, polyphenols
How to cite
M. Kotuła, J. Kapusta-Duch, B. Borczak, K. Dziadek, 2024. Effect of antioxidant biocomposites films on frozen stored raspberries. In: 3rd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL3.F009