Toward a circular bioeconomy: extracting cellulose from grape stalks

Liliana Araújo*, Adriana R. Machado, Manuela Pintado, Eduarda Vieira, Patrícia Moreira

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


The purpose of this study was to assess the extraction of cellulose from stalks of vines using auto-hydrolysis and characterize it. As the results obtained, the colorimeter readings displayed a final yellow color of the fiber, demonstrating that the bleaching process was insufficient and that multiple bleaching processes might be required. According to the FTIR (Fourier-transform infrared spectroscopy) data, there were stretching and deformation vibrations of characteristic peak that represent cellulose (2900, 1500, and 1200 cm−1). Although lignin and hemicellulose were partially removed according to the FTIR, distinct cellulose yields were achieved for each fraction, including fractions 500, 300, 250, 150 µm, and retain, with values of 21.98, 12.70, 7.20, 5.74, and 3.11%, respectively. In sum, we were able to extract cellulose from the stalk vine, although the last step still needs to be optimized for better whitening.
Original languageEnglish
Article number86
Pages (from-to)1-7
Number of pages7
JournalEngineering Proceedings
Issue number1
Publication statusPublished - Jul 2023
EventThe 2nd International Electronic Conference on Processes: Process Engineering : Current State and Future Trends -
Duration: 17 May 202331 May 2023


  • Acid hydrolysis
  • Alkaline hydrolysis
  • Color
  • Fiber and size


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