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Integrated process for sequential extraction of saponins, xylan and cellulose from quinoa stalks (Chenopodium quinoa Willd.)

Ramirez, Alicia Gil LU ; Salas Veizaga, Daniel LU ; Grey, Carl LU ; Nordberg Karlsson, Eva LU ; Rodriguez Meizoso, Irene LU and Linares-Pastén, Javier LU (2018) In Industrial Crops and Products 121. p.54-65
Abstract
World quinoa production is increasing due its high nutritional value. As a consequence, large quantities of stalks accumulate as unused byproducts. Here, we verify the presence of saponins in the stalks and present a biorefinery approach with quinoa stalks as feedstock, using an integrated processing scheme to separate saponins, xylan and cellulose. Saponins were extracted using pressurized hot water extraction (PHWE), optimized by a central composite experimental design (rotatable 22) with temperature and extraction time as factors. Xylan was extracted from the residual solid material after PHWE by an alkaline method using 0.5 M NaOH at 80 °C. Cellulose was purified from the remaining residuals using acetic and nitric acid at 120 °C,... (More)
World quinoa production is increasing due its high nutritional value. As a consequence, large quantities of stalks accumulate as unused byproducts. Here, we verify the presence of saponins in the stalks and present a biorefinery approach with quinoa stalks as feedstock, using an integrated processing scheme to separate saponins, xylan and cellulose. Saponins were extracted using pressurized hot water extraction (PHWE), optimized by a central composite experimental design (rotatable 22) with temperature and extraction time as factors. Xylan was extracted from the residual solid material after PHWE by an alkaline method using 0.5 M NaOH at 80 °C. Cellulose was purified from the remaining residuals using acetic and nitric acid at 120 °C, which resulted in recovery of white cotton-like cellulose, showing no need of further bleaching. The saponin yield was significantly increased at temperatures exceeding 110 °C, with highest amounts obtained at 195 °C (15.4 mg/g raw material). The yield in the following xylan extraction (maximum 120 mg/g raw material) was however significantly reduced when preceded by PHWE above 110 °C, indicating degradation of the polymer. Cellulose recovery (maximum 296 mg/g raw material) was less affected by variations in temperature and time in the preceding PHWE. The results obtained shows that tuning between saponin and xylan extraction is critical. This approach is foreseen to be applicable to the valorisation of residual fiber-rich biomass from various types of crops, besides quinoa. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Industrial Crops and Products
volume
121
pages
54 - 65
publisher
Elsevier
external identifiers
  • scopus:85046627022
ISSN
0926-6690
DOI
10.1016/j.indcrop.2018.04.074
language
English
LU publication?
yes
id
51b6754b-aa51-45e9-bf81-e6177b9f196c
date added to LUP
2018-05-10 10:47:28
date last changed
2018-05-21 08:59:21
@article{51b6754b-aa51-45e9-bf81-e6177b9f196c,
  abstract     = {World quinoa production is increasing due its high nutritional value. As a consequence, large quantities of stalks accumulate as unused byproducts. Here, we verify the presence of saponins in the stalks and present a biorefinery approach with quinoa stalks as feedstock, using an integrated processing scheme to separate saponins, xylan and cellulose. Saponins were extracted using pressurized hot water extraction (PHWE), optimized by a central composite experimental design (rotatable 22) with temperature and extraction time as factors. Xylan was extracted from the residual solid material after PHWE by an alkaline method using 0.5 M NaOH at 80 °C. Cellulose was purified from the remaining residuals using acetic and nitric acid at 120 °C, which resulted in recovery of white cotton-like cellulose, showing no need of further bleaching. The saponin yield was significantly increased at temperatures exceeding 110 °C, with highest amounts obtained at 195 °C (15.4 mg/g raw material). The yield in the following xylan extraction (maximum 120 mg/g raw material) was however significantly reduced when preceded by PHWE above 110 °C, indicating degradation of the polymer. Cellulose recovery (maximum 296 mg/g raw material) was less affected by variations in temperature and time in the preceding PHWE. The results obtained shows that tuning between saponin and xylan extraction is critical. This approach is foreseen to be applicable to the valorisation of residual fiber-rich biomass from various types of crops, besides quinoa.},
  author       = {Ramirez, Alicia Gil and Salas Veizaga, Daniel and Grey, Carl and Nordberg Karlsson, Eva and Rodriguez Meizoso, Irene and Linares-Pastén, Javier},
  issn         = {0926-6690},
  language     = {eng},
  pages        = {54--65},
  publisher    = {Elsevier},
  series       = {Industrial Crops and Products},
  title        = {Integrated process for sequential extraction of saponins, xylan and cellulose from quinoa stalks (Chenopodium quinoa Willd.)},
  url          = {http://dx.doi.org/10.1016/j.indcrop.2018.04.074},
  volume       = {121},
  year         = {2018},
}