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Title
Recovery of anthocyanins from grape pomace extract (Pinot noir) using magnetic particles based on poly(vinyl alcohol)
Authors
TATIANA LOZOVSKAYA GERALD BRENNER-WEISS MATTHIAS FRANZREB and MICHAEL NUSSER
Published
Volume 46 Issue 7-8 September-October
Keywords
anthocyanins, magnetic particles, M-PVA, magnetic separation, concentration
Abstract
The paper is devoted to the possibility of separating a concentrate of anthocyanin pigments from an aqueous extract
(0.1% HCl) of grape pomace (Pinot noir) with the use of magnetic particles based on poly(vinyl alcohol) (M-PVA)
having an average size of 1-3 microns. Due to their magnetic properties, these biologically inert, hydrophilic particles
provide the possibility of fast and efficient separation from crude suspensions using an easily scalable magnet
technology. The application of magnetic separation technology allows carrying out the process of isolating
anthocyanins within 25 minutes. The sorption capacity of M-PVA is 4-5 times higher compared to other non-ionic
sorbents (Amberlite XAD 16, Stirosorb MCDS×100), widely used for the extraction of polyphenolic compounds. In the
developed process, the M-PVA particles adsorb up to 40-60% of the anthocyanins present in the initial solution.
Afterwards, ethanol containing 0.1% HCl extracts 85% of the absorbed anthocyanins resulting in a purified and
threefold concentrated solution if compared to the original extract. HPLC indicated that the pigment composition of the
concentrate is the same as in the original extract. The efficiency of the magnetic particles does not decrease by the
adsorption in turbid media and reuse is possible without special treatment.
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