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Extraction of dietary fibers from cassava pulp and cassava distiller's dried grains and assessment of their components using Fourier transform infrared spectroscopy to determine their further use as a functional feed in animal diets

  • Okrathok, Supattra (School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology) ;
  • Thumanu, Kanjana (Synchrotron Light Research Institute (Public Organization)) ;
  • Pukkung, Chayanan (School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology) ;
  • Molee, Wittawat (School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology) ;
  • Khempaka, Sutisa (School of Animal Technology and Innovation, Institute of Agricultural Technology, Suranaree University of Technology)
  • Received : 2021.09.20
  • Accepted : 2021.12.12
  • Published : 2022.07.01

Abstract

Objective: The present study was to investigate the extraction conditions of dietary fiber from dried cassava pulp (DCP) and cassava distiller's dried grains (CDG) under different NaOH concentrations, and the Fourier transform infrared (FTIR) was used to determine the dietary fiber components. Methods: The dried samples (DCP and CDG) were treated with various concentrations of NaOH at levels of 2%, 4%, 6%, and 8% using a completely randomized design with 4 replications of each. After extraction, the residual DCP and CDG dietary fiber were dried in a hot air oven at 55℃ to 60℃. Finally, the oven dried extracted dietary fiber was powdered to a particle size of 1 mm. Both extracted dietary fibers were analyzed for their chemical composition and determined by FTIR. Results: The DCP and CDG treated with NaOH linearly or quadratically or cubically (p<0.05) increased the total dietary fiber (TDF) and insoluble fiber (IDF). The optimal conditions for extracting dietary fiber from DCP and CDG were under treatment with 6% and 4% NaOH, respectively, as these conditions yielded the highest TDF and IDF contents. These results were associated with the FTIR spectra integration for a semi-quantitative analysis, which obtained the highest cellulose content in dietary fiber extracted from DCP and CDG with 6% and 4% NaOH solution, respectively. The principal component analysis illustrated clear separation of spectral distribution in cassava pulp extracted dietary fiber (DFCP) and cassava distiller's dried grains extracted dietary fiber (DFCDG) when treated with 6% and 4% NaOH, respectively. Conclusion: The optimal conditions for the extraction of dietary fiber from DCP and CDG were treatment with 6% and 4% NaOH solution, respectively. In addition, FTIR spectroscopy proved itself to be a powerful tool for fiber identification.

Keywords

Acknowledgement

This work was supported by Suranaree University of Technology (SUT), Thailand Science Research and Innovation (TSRI), National Science, Research and Innovation Fund (NSRF), and the National Research Council of Thailand (NRCT) (SUT3-303-60-24-09). The authors would like to acknowledge the staff of FTIR team (beam line 4.1: Infrared Spectroscopy and Imaging) from Synchrotron Light Research Institute (Public Organization) in Thailand for their technical suggestions. We would also like to express our sincere thanks to Pascal Mermillod from Reproductive Physiology and Behavior unit, National Institute of Agronomical Research (INRA), France for his guiding and proofreading this manuscript with the support of the Siam Huber Curien grant n° 42879QC.

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