Abstract
Ultrafiltration and diafiltration were proposed for the production of cloudy apple-cranberry juice of reduced sugar content. Ceramic membrane of 15 kDa MWCO was used in a cross-flow configuration, the retentate was treated as a final product. The juice before and after membrane treatments were characterized for total soluble solids content, glucose and fructose content, density, acidity, total phenolic content, antiradical activity, color parameters and FTIR spectra. The transmission of sugars after ultrafiltration was 24% and after diafiltration it reached 36%, with the simultaneous rejection of colloids, high molecular weight compounds and fine particles. The percentage of the reference intake of sugars connected with the consumption of 250 mL portion of obtained products was reduced from 27.0 to 20.7 and 15.7%, after ultrafiltration and diafiltration, respectively.
Highlights
Fruit juices are an important part of the diet of both adults and children, as well as people with special dietary needs
When comparing the average energy and sugars content in one portion of apple juice (250 mL) to the reference intake presented in Regulation of the European Parliament and of the Council [3], which are 2000 kcal and 90 g, respectively, it is evident that while the energy intake connected with this consumption is relatively low (5.6% of the reference intake), sugars intake is much higher, and reaches even more than 20% of the reference intake
We propose a novel sustainable approach for the production of low-sugar cloudy apple-cranberry juice, in which it is possible to utilize the retentate coming from cloudy juice ultrafiltration (UF) or diafiltration (DF)
Summary
Fruit juices are an important part of the diet of both adults and children, as well as people with special dietary needs. They are a source of valuable vitamins, antioxidants and minerals [1]. They contain a significant amount of energy and sugars (in apple juice on average 45 kcal, and 9.6 g in 100 g, respectively), similar to sweetened beverages [2]. One glass of fruit juice contains much more sugar than one piece of fruit
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