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Oak bark, an abundant but underutilized biomass, is often combusted as fuel or discarded. This study aims to valorize this biomass by efficiently extracting tannins, a class of natural polyphenolic compounds. The effects of bark particle size, solvent type, and solvent concentration on the extraction yield and tannin composition were evaluated. The highest extraction yield (6.3%) was obtained from bark particles with a size range of 20– 40 mesh. Despite their slightly lower extraction yields, finer particles (> 40 mesh) exhibited higher total polyphenol and tannin contents. Among the solvents tested, 90% ethanol provided the highest average yield (6.4 %), whereas acetone resulted in lower yields but higher tannin purity. The recovery efficiency of condensed tannins was maximized when bark particles > 40 mesh were extracted using 90% ethanol. These findings demonstrate the crucial roles of particle size and solvent selection in determining the quantitative and qualitative efficiency of tannin extraction, confirming the potential of oak bark as a valuable biobased resource.

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Study on the valorization of oak bark biomass. 1, Extraction and characterization of tannins Sa Rang Choi, Jung Myoung Lee p. 66-74
Study on the valorization of oak bark biomass. 2, Organosolv pulping of bark residue after tannin extraction Sa Rang Choi, Jung Myoung Lee p. 75-84
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