Industrial chokeberry pomace is very rich in polyphenols. The main focus here lies on the possible relationship between the particle size of chokeberry milled pomace and an enhanced absorption and transport of polyphenols by Caco-2 cells. Wet milling was used to produce materials with particle size distributions in the micrometre and in the sub-micrometre to nanometre ranges starting from chokeberry pomace. Milled materials with about 50% of the particles with a mean size (x) of 223 ± 13 µm (coarse milling) and about 90% of the particles with x of 160 ± 40 nm (fine milling, sonication) were obtained. None of the milled materials exhibited cytotoxic effects within the tested concentration-ranges. The polyphenol absorption and the transport efficiencies from the fine and the coarse milled materials were similar. Thus, no effect of the particle size upon cellular uptake and transport could be established, but agglomeration of particle during incubation cannot be excluded as the cause. Furthermore, based on polyphenol stability we postulate that direct milling may be applied to valorise the processing by-product from commercial fruit juice production.

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http://dx.doi.org/10.1080/09637486.2019.1595542DOI Listing

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