Characteristics of hot water extracts from the bark of cultivated willow (Salix sp.)

Jinze Dou, Chunlin Xu, Jari J. Koivisto, Justin K. Mobley, Dharshana Padmakshan, Martin Kögler, Wen Yang Xu, Stefan Willför, John Ralph, Tapani Vuorinen

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)

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 degrees 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.
Original languageUndefined/Unknown
Pages (from-to)5566–5573
Number of pages15
JournalACS Sustainable Chemistry and Engineering
Volume6
Issue number4
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

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

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