Summary
The influence of several variables (temperature, time, alkali type and concentration) on the yield of polyphenol from alkaline extractions is studied, using Pinus pinaster bark. For this purpose, the gravimetric Stiasny method and a spectrophotometric procedure based on molibdate ions are used. The influence of time on the extraction process was evaluated, and the results were correlated by semiempirical equations.
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The authors are grateful to Prof. E. Patino for revising the English version of this manuscript
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Vázquez, G., Antorrena, G. & Parajó, J.C. Studies on the utilization of Pinus pinaster bark. Wood Sci.Technol. 21, 155–166 (1987). https://doi.org/10.1007/BF00376195
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DOI: https://doi.org/10.1007/BF00376195