Abstract
An insight into chemical composition, nutritional value and potential health risk of increasingly popular bilberry and black chokeberry commercial juices was provided, based on HPLC-UV (anthocyanins and non-anthocyanin phenolics; patulin; hydroxymethylfurfural), AAS (minerals) and ICP-MS (trace elements) analyses. Delfinidin (in bilberry) and cyanidin glycosides (in bilberry and chokeberry) were the most abundantly present anthocyanins, chlorogenic acid dominated among non-anthocyanin polyphenols, while mineral composition revealed high K and desirable low Na content. A glass of blueberry/black chockeberry juice (200 mL) per day could provide up to 63.5/27.0 mg of anthocyanins, 147.2/314.0 mg of polyphenols, almost 50% of Mg (the only mineral satisfying the requirement for a nutritional claim) and, in case of chokeberry, 20% of Mn adequate intake. No health risk was observed related to any of the investigated toxicants. Despite indications of a possible benefitial role for health, observed compositional variations precluded positioning of berry juices as functional foods. The labelling could help specialist in nutrition and functional foods as well as health-conscious consumers seeking foods with reliable quantity of dietary valuable phytochemicals and minerals. Sufficiently characterised food has been one of the prerequisites for the approval of a health claim, along with sufficiently defined and substantiated claimed effect.
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