LIBS and Raman scattering studies of alginate solutions and gels

Hacene Boukari; Yahira Lopez; Shehu-Alimi Elelu; Cleon Barnett

doi:10.1117/12.3003370

13 March 2024 LIBS and Raman scattering studies of alginate solutions and gels

Hacene Boukari, Yahira Lopez, Shehu-Alimi Elelu, Cleon Barnett

Proceedings Volume PC12859, Colloidal Nanoparticles for Biomedical Applications XIX; PC1285908 (2024) https://doi.org/10.1117/12.3003370
Event: SPIE BiOS, 2024, San Francisco, California, United States

Abstract

We applied laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy to assess the structural content of alginate solutions and gels prepared at various concentrations (1.0 to 40 mg/mL). Alginate is a natural biopolymer typically extracted from brown seaweed and has been applied in diverse biomedical applications. LIBS measurements in Alginate solutions show spectral lines that can be attributed to calcium (422.6, 393.3, and 396.8 nm), magnesium (279.5 nm), strontium (460.7 nm), and C-N bond (~388.3 nm). Crosslinking the alginate solutions into hydrogels tends to reduce emission intensity, and many LIBS lines are not discerned. Measured Raman spectra show several peaks in addition to those of water and dissolved oxygen and nitrogen. The higher the alginate concentration, the higher the intensity of the alginate peaks. We combined the intensity correlation analysis (ICA), principal component analysis, and first-order derivative method to assess changes of the Raman peaks. Altogether, the results demonstrate how both techniques can provide complementary insight for chemical analysis of alginate solutions and gels.

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Citation Download Citation

Hacene Boukari, Yahira Lopez, Shehu-Alimi Elelu, and Cleon Barnett "LIBS and Raman scattering studies of alginate solutions and gels", Proc. SPIE PC12859, Colloidal Nanoparticles for Biomedical Applications XIX, PC1285908 (13 March 2024); https://doi.org/10.1117/12.3003370

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KEYWORDS

Laser induced breakdown spectroscopy

Raman scattering

Raman spectroscopy

Chemical analysis

Oxygen

Plasma

Principal component analysis

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