Structural Characterization of Biomass from Crassiphycus birdiae in natura and Residual

Abstract

Macroalgae contains micro and macromolecules of great interest for various sectors, for example, food, cosmetics, and pharmaceuticals. These compounds can be obtained through different extraction methods, among them the use of organic solvents with varying polarities. In this study, materials were characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy, infrared spectrometry, X-ray diffraction and differential scanning calorimetry in the seaweed biomasses before and after an extraction process with organic solvents. The red macroalgae Crassiphycus birdiae, cultivated on the northeast coast of Brazil, appeared, after extraction, as an amorphous material with some porosity. Its composition includes the elements carbon, oxygen, sodium, magnesium, sulfur, chlorine, potassium, aluminum, silicon, calcium, and iron. The presence of the agar polysaccharide was also verified by infrared spectroscopy. The decomposition of this polysaccharide was observed using differential scanning calorimetry.

Keywords:
macroalgae; red seaweed; residue; biomass; characterization analysis