Simultaneous recovery of ferulic acid and sugars from wheat bran enzymatic hydrolysate by diananofiltration
•New NF-based strategy to separate ferulic acid and xylose in wheat bran hydrolysate.•NTR7450 and 7470 membranes (Hydranautics) with 600 7 and ideally pH 9. In this condition, the negative charge of the membranes and the full ionization of FA conjugate to allow FA retention by electrostatic effects...
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Veröffentlicht in: | Separation and purification technology 2020-07, Vol.242, p.116755-11, Article 116755 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | •New NF-based strategy to separate ferulic acid and xylose in wheat bran hydrolysate.•NTR7450 and 7470 membranes (Hydranautics) with 600 7 and ideally pH 9. In this condition, the negative charge of the membranes and the full ionization of FA conjugate to allow FA retention by electrostatic effects whereas pore size is large enough to allow sugars to permeate. Retentions obtained on model hydrolysate at 10 bar were 85% for FA and 20% for xylose. When processing real hydrolysate, however, sugar retention was more than 40%. During diafiltration, pH decrease in the retentate was observed. Manual addition of concentrated NaOH did not allow to counterbalance completely this decrease and to ensure the optimal pH of 9 in the retentate. This led to a significative increase in sugar retention, and consequently, sugar removal in the retentate reached only 56% for a diafiltration factor Vd of 4.5. These observations were supported by a diafiltration model with variable retention. |
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ISSN: | 1383-5866 1873-3794 |
DOI: | 10.1016/j.seppur.2020.116755 |