Extracting Ferulic Acid from Corn Fibre Using Mild Alkaline Extraction: A Pilot Scale Study

Valério, Rita; Cadima, Mafalda; Crespo, João G.; Brazinha, Carla

doi:10.1007/s12649-021-01514-x

Cited by 7 publications

(8 citation statements)

References 36 publications

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“…An increase in the NaOH concentration did not produce a significant rise in the removal yields, especially between 0.25 and 0.5 M, there was only an increase of 0.6% and 0.2% for CA and FA, respectively. A similar low effect in the FA and CA release by increasing alkaline concentrations was previously reported in rice straw and corn bran . A further increase in the NaOH concentration to 1 M did lead to higher FA and CA removal (88.8% and 52.2%) at the expense of other biomass components (Figure B–D).…”

Section: Resultssupporting

confidence: 84%

“…The yield of FA obtained by the ALACEN process ( Figure 3 , Table 1 ) is in the high range compared to the yields observed in the literature with alkaline, enzymatic, and deep eutectic treatments in several biomasses, where the ranges are between 0.3 and 13.32 mg FA /g biomass 49 , 50 , 68 − 71 (only monomeric FA and CAs were quantified). As an example, Pazo-Cepeda et al 72 obtained a maximum yield of 8.8% from wheat bran using a pressurized aqueous ethanol solution.…”

Section: Resultsmentioning

confidence: 59%

“…A similar low effect in the FA and CA release by increasing alkaline concentrations was previously reported in rice straw 49 and corn bran. 50 A further increase in the NaOH concentration to 1 M did lead to higher FA and CA removal (88.8% and 52.2%) at the expense of other biomass components (Figure 3B−D). Lignin was the most affected component, with 0.25 M NaOH 77% of the initial acidinsoluble lignin remained, while with 1 M only 24% remained (Figure 3B).…”

Section: ■ Resultsmentioning

confidence: 90%

“…One of the main limitations in the purification of FA from alkaline streams is the viscosity given to the solution by the hemicellulose cosolubilized with the hydroxyminic acids. 50,75,76 The remaining hemicellulose fraction was largely solubilized in the subsequent dilute acid step of the ALACEN process. Between 45 and 75% of the initial hemicellulose was solubilized, and above 85% of the solubilized xylan was found as xylose for all the herbaceous biomasses (Figure 7).…”

Section: ■ Resultsmentioning

confidence: 99%

“…Even though the quantities and concentrations obtained are quite low to develop a feasible economic process, the development of selective FA and CA removal is of great interest. One of the main limitations in the purification of FA from alkaline streams is the viscosity given to the solution by the hemicellulose cosolubilized with the hydroxyminic acids. ,, …”

Section: Resultsmentioning

confidence: 99%

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ALACEN: A Holistic Herbaceous Biomass Fractionation Process Attaining a Xylose-Rich Stream for Direct Microbial Conversion to Bioplastics

Bertran-Llorens,

Zhou,

Palazzolo

et al. 2024

ACS Sustainable Chem. Eng.

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Lignocellulose biorefining is a promising technology for the sustainable production of chemicals and biopolymers. Usually, when one component is focused on, the chemical nature and yield of the others are compromised. Thus, one of the bottlenecks in biomass biorefining is harnessing the maximum value from all of the lignocellulosic components. Here, we describe a mild stepwise process in a flow-through setup leading to separate flow-out streams containing cinnamic acid derivatives, glucose, xylose, and lignin as the main components from different herbaceous sources. The proposed process shows that minimal degradation of the individual components and conservation of their natural structure are possible. Under optimized conditions, the following fractions are produced from wheat straw based on their respective contents in the feed by the ALkaline ACid ENzyme process: (i) 78% ferulic acid from a mild ALkali step, (ii) 51% monomeric xylose free of fermentation inhibitors by mild ACidic treatment, (iii) 82% glucose from ENzymatic degradation of cellulose, and (iv) 55% native-like lignin. The benefits of using the flow-through setup are demonstrated. The retention of the lignin aryl ether structure was confirmed by HSQC NMR, and this allowed monomers to form from hydrogenolysis. More importantly, the crude xylose-rich fraction was shown to be suitable for producing polyhydroxybutyrate bioplastics. The direct use of the xylose-rich fraction by means of the thermophilic bacteria Schlegelella thermodepolymerans matched 91% of the PHA produced with commercial pure xylose, achieving 138.6 mgPHA/gxylose. Overall, the ALACEN fractionation method allows for a holistic valorization of the principal components of herbaceous biomasses.

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Section: Resultssupporting

confidence: 84%