Hydrochloric acid-catalyzed hydrothermal pretreatment of brown seaweed residues for enhancing biofuel production

Abstract

The hydrochloric acid-catalyzed hydrothermal pretreatment of brown seaweed residues (Laminaria japonica) was optimized with respect to three operating factors: temperature, time, and the concentration of HCl, using response surface methodology (RSM). In order to confirm the significance of the quadratic model, an analysis of variance was performed, which resulted in an F-value of 11.09. Therefore, the regression model was highly significant. Additionally, the pareto chart was used to contrast the absolute values of the standardized effects. Response surface and contour plots were used to illustrate a surface with a maximum. The perturbation plot showed the sensitivity of the reducing sugars yield to the independent factors. Under the reaction conditions of 142 °C, 9 °C, 18.6 min, and 0.1 N HCl concentration, the experimental yield of 113.0 mg/g and the predicted yield of 107.5 mg/g were obtained.

Sustainable circular biorefinery approach for novel building blocks and bioenergy production from algae using microbial fuel cell

“…From the economic standpoint of the macroalgal biorefinery, phycocolloids have frequently been the primary target for recovery due to being commercially valued [ 181 ]. Park et al [ 182 ] and Alfonsín et al [ 33 ] investigated the extraction of alginate and carrageenan, respectively, and assessed the appropriateness of the remaining residues as feedstock for rare sugar extraction using chemo-catalytic hydrolysis assay. Park et al [ 182 ] identified that 40% of alginate can be extracted from Laminaria japonica , and 107.5 g/L of glucose was successfully extricated post hydrochloric acid hydrolysis.…”

“…Park et al [ 182 ] and Alfonsín et al [ 33 ] investigated the extraction of alginate and carrageenan, respectively, and assessed the appropriateness of the remaining residues as feedstock for rare sugar extraction using chemo-catalytic hydrolysis assay. Park et al [ 182 ] identified that 40% of alginate can be extracted from Laminaria japonica , and 107.5 g/L of glucose was successfully extricated post hydrochloric acid hydrolysis. Similarly, Alfonsín et al [ 33 ] suggested that a biorefinery approach using Eucheuma denticulatum for the production of carrageenan and rare sugars could be commercially viable and yielded 19.7% of extricated rare sugars corresponding to 0.30 g/L of glucose from the carrageenan-free residue through acid hydrolysis.…”