Abstract
ABSTRACTThe purpose of the study was to define the impact of ozonisation duration and concentration on selected chemical, physical, and microbiological properties of Rubus ideaus red-fruited raspberries of the Polka variety. Raspberry fruit was exposed to a stream of ozone in concentration of 0.3 and 0.9 mg/L over a period of 60 and 120 min. The scope of the study covered the measurements of titratable acidity, soluble solids concentration, and such health-promoting indicators as content of phenol compounds, flavonoids, anthocyanins and vitamins C, total antioxidant activity (TAA) on 0, 4th, and 8th day of storage. The ozone treated fruit had higher level of phenol compounds and demonstrated higher TAA compared to untreated raspberries. The use of ozone made it possible to curb the development of yeast and moulds on the surface of raspberries, in which the dosage of 0.9 mg/L and treatment time of 60 min proved most efficient.
Highlights
European raspberry (Rubus ideaus) is one of the first berries to have been collected by the human and is cultivated in many varieties differing in the size, colour, aroma, and fragrance of the fruit
The scope of the study covered the measurements of titratable acidity, soluble solids concentration, and such health-promoting indicators as content of phenol compounds, flavonoids, anthocyanins and vitamins C, total antioxidant activity (TAA) on 0, 4th, and 8th day of storage
TA is among the basic parameters that decide about fruit quality, and its enhanced levels may suggest inappropriate storage conditions
Summary
European raspberry (Rubus ideaus) is one of the first berries to have been collected by the human and is cultivated in many varieties differing in the size, colour, aroma, and fragrance of the fruit. Raspberry is today highly esteemed and desired by consumers mostly for taste value, yet for the proven health-promoting properties (Paredes-López, Cervantes-Ceja, Vigna-Pérez, & Hernández-Pérez, 2010). It is so as the berries are a rich source of antioxidants, especially anthocyanins (Chen, Xin, Zhang, & Yuan, 2015), ascorbic acid (Miret & Munné-Bosch, 2016), phenolic acids (Mazur, Nes, Wold, Remberg, & Aaby, 2014), and flavonoids (Giampieri et al, 2015; Ludwig et al, 2015; Mullen et al, 2002; Skrovankova, Sumczynski, Mlcek, Jurikova, & Sochor, 2015). Raspberries reinforce and stimulate proper activity of the heart and circulatory system (Anttonen & Karjalainen, 2005) and could be helpful in diets targeted on managing early stages of type II diabetes and hypertension (Cheplick, Kwon, Bhowmik, & Shetty, 2007)
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