Characteristics of Hot Water Extracts from the Bark of Cultivated Willow (Salix sp.)

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Åbo Akademi University
  • University of Wisconsin-Madison
  • University of Helsinki
  • Technical University of Berlin

Abstract

Willow bark is a rich source of heterogeneous polyphenolic compounds and a potential feedstock for biorefinery processes aiming at chemicals and fiber production. Here, mild hot water treatment of willow hybrid Karin was studied to find a practical means of isolating its non-cell-wall components for their utilization in a willow biorefinery proposed to aid valorization of the willow biomass. A short aqueous treatment of the bark at 80 °C liberated the extract in >20% yield under unpressurized conditions. The extract was characterized using mainly gas chromatography-mass spectrometry and one- and two-dimensional NMR techniques. Authentic analytes were applied to confirm the identification and quantification of the main components that were picein, (+)-catechin, triandrin, glucose, and fructose. Fructose was converted into 5-hydroxymethylfurfural in an acidic treatment which led to its condensation with the phenolic components and formation of a recalcitrant precipitate that should be avoided.

Details

Original languageEnglish
Pages (from-to)5566-5573
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number4
Publication statusPublished - 2 Apr 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • (+)-Catechin, 5-Hydroxymethylfurfural, Fructose, Picein, Triandrin, Willow bark

ID: 18950159