According to our previous work, residual seaweed after alginate extraction was treated under the optimal hydrolysis condition.
Sample was subjected to 15 mL 0.4 M H2SO4 solution and put into microwave reactor for irradiation at 150 C for 1 min.
After irradiation, the suspensions were centrifuged to separate the residual alga, which was washed with distilled water and dried at 80 C until constant weight.
The liquid was neutralized for HPAEC analysis.
The alga residue was characterized by elemental analysis and calorific value test.