Quantitative and qualitative saccharide analysis of North Atlantic brown seaweed by gas chromatography/mass spectrometry and infrared spectroscopy

Brown seaweeds contain a variety of saccharides which have potential industrial uses. The most abundant polysaccharide in brown seaweed is typically alginate, consisting of mannuronic (M) and guluronic acid (G). The ratio of these residues fundamentally determines the physicochemical properties of a...

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Bibliographic Details
Published in:International Journal of Biological Macromolecules
Main Authors: Niemi, Calle, Takahashi, Junko, Gorzsás, András, Gentili, Francesco G.
Format: Article in Journal/Newspaper
Language:English
Published: Umeå universitet, Kemiska institutionen 2024
Subjects:
Alginate
FTIR
GC/MS
MG ratio
North Atlantic brown seaweed
Renewable Bioenergy Research
Förnyelsebar bioenergi
Organic Chemistry
Organisk kemi
North Atlantic
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-219754
https://doi.org/10.1016/j.ijbiomac.2023.127870
Description
Summary:Brown seaweeds contain a variety of saccharides which have potential industrial uses. The most abundant polysaccharide in brown seaweed is typically alginate, consisting of mannuronic (M) and guluronic acid (G). The ratio of these residues fundamentally determines the physicochemical properties of alginate. In the present study, gas chromatography/mass spectrometry (GC/MS) was used to give a detailed breakdown of the monosaccharide species in North Atlantic brown seaweeds. The anthrone method was used for determination of crystalline cellulose. The experimental data was used to calibrate multivariate prediction models for estimation of total carbohydrates, crystalline cellulose, total alginate and alginate M/G ratio directly in dried, brown seaweed using three types of infrared spectroscopy, using relative error (RE) as a measure of predictive accuracy. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) performed well for the estimation of total alginate (RE = 0.12, R2 = 0.82), and attenuated total reflectance (ATR) showed good prediction of M/G ratio (RE = 0.14, R2 = 0.86). Both DRIFTS, ATR and near infrared (NIR) were unable to predict crystalline cellulose and only DRIFTS performed better in determining total carbohydrates. Multivariate spectral analysis is a promising method for easy and rapid characterization of alginate and M/G ratio in seaweed.

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