To make a comparison, seaweed sample was also treated for fucoidan extraction only, alginate extraction only and hydrolysis only under the same microwave irradiation and separation method as for biorefinery process.
As fucoidan was extracted as first product in the biorefinery process, the yield of fucoidan for fucoidan only extraction process was same as it is in biorefinery process, 14.09%.
The alginate yield of alginate only process was 23.13%, which is about 5% higher than that from biorefinery process (18.24%), and this indicated that although there was some loss of alginate during the first fucoidan extraction step,
the majority of alginate could still be recovered as second product.
The reason that alginate could not be extracted as first product is that alginate is a principal material of cell wall, the extraction of alginate will destroy the structure of the cell, resulting in both alginate and fucoidan being soluble in solution. As reported in our previous study (Yuan and Macquarrie, 2015b), dilute acid could extract fucoidan without dissolving the majority of alginate at same time, although there was a little alginate precipitated out by CaCl2 in fucoidan rich solution.
In terms of algal residue, it is reasonable that residue left after the three single processes were higher than the biorefinery process
To make a comparison, seaweed sample was also treated for fucoidan extraction only, alginate extraction only and hydrolysis only under the same microwave irradiation and separation method as for biorefinery process.As fucoidan was extracted as first product in the biorefinery process, the yield of fucoidan for fucoidan only extraction process was same as it is in biorefinery process, 14.09%.The alginate yield of alginate only process was 23.13%, which is about 5% higher than that from biorefinery process (18.24%), and this indicated that although there was some loss of alginate during the first fucoidan extraction step,the majority of alginate could still be recovered as second product.The reason that alginate could not be extracted as first product is that alginate is a principal material of cell wall, the extraction of alginate will destroy the structure of the cell, resulting in both alginate and fucoidan being soluble in solution. As reported in our previous study (Yuan and Macquarrie, 2015b), dilute acid could extract fucoidan without dissolving the majority of alginate at same time, although there was a little alginate precipitated out by CaCl2 in fucoidan rich solution.In terms of algal residue, it is reasonable that residue left after the three single processes were higher than the biorefinery process
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