Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 496267
Title Adsorption of isoflavones onto PVPP in the presence of a soy matrix
Author(s) Jankowiak, Lena; Avermaete, Ivonne Van; Boom, Remko; Goot, Atze Jan Van Der
Source Separation and Purification Technology 149 (2015). - ISSN 1383-5866 - p. 479 - 487.
Department(s) Food Process Engineering
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Okara - Partition coefficient - Polyphenols - Protein-isoflavone interaction - Waste utilisation

The adsorption of isoflavones from an okara extract onto polyvinyl polypyrrolidone (PVPP) was studied for a pH ranging from 4 to 7. In general, the affinity of aglycones to PVPP was around 10 times higher than the affinity of the glycosides. Towards lower pH, the adsorption performance improved for the glycosides, especially for the malonyl-glucosides, but not for the aglycones. Towards neutral pH the affinity also increased, and showed the highest affinity for the total amount of isoflavones. Due to a large amount of protein present in the extract, some isoflavones were lost at lower pH due to the precipitation of protein, which led to losses of 3-25% in the protein fraction without any addition of PVPP. Moreover, PVPP was added to the crude starting material (i.e. okara), investigating the effect of the matrix on the adsorption and the possibility to combine the extraction and adsorption process. The isoflavone extraction was modelled using affinity constants of isoflavones to the matrix and the PVPP. The simulation showed that concurrent PVPP addition results in more extraction from the isoflavones from the matrix.

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