It was established that the action of [H+] at concentration 1.96∙10–2 M at 90°C for 5–20 min decreased sharply the molecular weight of galactomannan and carrageenan and increased their overall reductive capability. The action of [OH–] at concentrations 2.6∙10–2 and 26∙10–2 under the same conditions was characterized by a slow decrease of the molecular weight and retention of the functionality of the polysaccharides. It was shown that modified galactomannan and κ-carrageenan exhibited increased watersolubility while retaining the structure and gel-forming and stabilizing capabilities and degree of sulfation (for carrageenan).
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Acknowledgment
The work was supported financially by the RFBR (Grants 12-03-90433-Ukr_a and 12-03-31610 mol_a); Interdisciplinary Integrated Projects of the SB RAS Nos. 85 and 134; a Partnering Integrated Project, SB RAS, SB RAMS, and UB RAS No. 1; an integrated collaborative research project of the SB RAS, Academy of Sciences of Mongolia, and the Ministry of Mongolia for Education, Culture, and Science No. 14; and a grant of the RF President for support of leading scientific schools NSh-1550.2012.3.
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Translated from Khimiya Prirodnykh Soedinenii, No. 3, May–June, 2013, pp. 347–351.
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Lesnichaya, M.V., Aleksandrova, G.P., Sukhov, B.G. et al. Molecular-weight characteristics of galactomannan and carrageenan. Chem Nat Compd 49, 405–410 (2013). https://doi.org/10.1007/s10600-013-0625-x
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DOI: https://doi.org/10.1007/s10600-013-0625-x