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Gonzales KN, Troncoso OP, Torres FG, Lopez D
Molecular α-relaxation process of exopolysaccharides extracted from Nostoc commune cyanobacteria
International Journal of Biological Macromolecules 161 (2020)
1516-1525
|
R-Lac-(2-3)-b-D-GlcpA-(1-6)-b-D-Glcp-(1-4)-a-D-Galp-(1-4)-b-D-Glcp-(1-4)-D-Xylp |
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Nostoc commune
(NCBI TaxID 1178,
species name lookup)
Taxonomic group: bacteria / Cyanobacteria
(Phylum: Cyanobacteria)
The structure was elucidated in this paperNCBI PubMed ID: 32755710Publication DOI: 10.1016/j.ijbiomac.2020.07.268Journal NLM ID: 7909578Publisher: Butterworth-Heinemann
Correspondence: Fernando G. Torres <fgtorres
pucp.pe>
Institutions: Department of Mechanical Engineering, Pontificia Universidad Católica del Perú (Lima 32 Perú). Av. Universitaria 1801, Lima 32, Lima, Peru, Institute of Polymer Science and Technology, Spanish Council for Scientific Research (ICTP-CSIC), Madrid, Spain
Broadband dielectric spectroscopy was used to investigate the molecular a-relaxation of the exopolysaccharides (EPS) extracted from Nostoc commune cyanobacteria. The EPS were modified in different ways. EPS were carboxymethylated to obtain carboxymethyl-exopolysaccharides (CEPS). EPS and CEPS were doped with ammonium iodide and 1-butyl-3-methylimidazolium chloride. An a relaxation process was observed for all specimens. The temperature dependence of the relaxation times for pure and doped, EPS and CEPS polymers exhibited non-Arrhenius behavior. This relaxation process was associated with the glass transition of the complex heteropolysaccharides produced by the cyanobacteria. The molecular mobility at the glass transition, Tg, was affected by both the carboxymethylation treatment and the doping. The fragility index also decreased for the doped specimens, which may be attributed to an increase in the mobility of the polymer chains due to the plasticizing effect of the doping agents.
exopolysaccharides, engineering, carboxymethylation, Nostoc commune, α-Relaxation, BDS, doping
Structure type: oligomer
Location inside paper: p.1518, Fig.1
Compound class: EPS
Contained glycoepitopes: IEDB_114701,IEDB_115136,IEDB_136906,IEDB_137472,IEDB_140630,IEDB_141794,IEDB_142488,IEDB_146664,IEDB_151528,IEDB_167188,IEDB_174332,IEDB_190606,IEDB_423153,IEDB_983931,SB_192,SB_7
Methods: GLC-MS, X-ray, sugar analysis, FTIR, SEM, carboxymethylation, DSC, Broadband Dielectric Spectroscopy (BDS)
Comments, role: The proposed structure of the oligosaccharide isolated after trifluoroacetic acid hydrolysis of the EPS.
Related record ID(s): 3681, 32109
NCBI Taxonomy refs (TaxIDs): 1178
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There is only one chemically distinct structure:
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Gonzales KN, Troncoso OP, Torres FG, Lopez D
Molecular α-relaxation process of exopolysaccharides extracted from Nostoc commune cyanobacteria
International Journal of Biological Macromolecules 161 (2020)
1516-1525
|
R-Lac-(2-3)-b-D-GlcpA-(1-6)-+
|
b-D-Glcp-(1-4)-b-D-Xylp-(1-4)-b-D-Glcp-(1-4)-D-Galp |
Show graphically |
Nostoc commune
(NCBI TaxID 1178,
species name lookup)
Taxonomic group: bacteria / Cyanobacteria
(Phylum: Cyanobacteria)
The structure was elucidated in this paperNCBI PubMed ID: 32755710Publication DOI: 10.1016/j.ijbiomac.2020.07.268Journal NLM ID: 7909578Publisher: Butterworth-Heinemann
Correspondence: Fernando G. Torres <fgtorres
pucp.pe>
Institutions: Department of Mechanical Engineering, Pontificia Universidad Católica del Perú (Lima 32 Perú). Av. Universitaria 1801, Lima 32, Lima, Peru, Institute of Polymer Science and Technology, Spanish Council for Scientific Research (ICTP-CSIC), Madrid, Spain
Broadband dielectric spectroscopy was used to investigate the molecular a-relaxation of the exopolysaccharides (EPS) extracted from Nostoc commune cyanobacteria. The EPS were modified in different ways. EPS were carboxymethylated to obtain carboxymethyl-exopolysaccharides (CEPS). EPS and CEPS were doped with ammonium iodide and 1-butyl-3-methylimidazolium chloride. An a relaxation process was observed for all specimens. The temperature dependence of the relaxation times for pure and doped, EPS and CEPS polymers exhibited non-Arrhenius behavior. This relaxation process was associated with the glass transition of the complex heteropolysaccharides produced by the cyanobacteria. The molecular mobility at the glass transition, Tg, was affected by both the carboxymethylation treatment and the doping. The fragility index also decreased for the doped specimens, which may be attributed to an increase in the mobility of the polymer chains due to the plasticizing effect of the doping agents.
exopolysaccharides, engineering, carboxymethylation, Nostoc commune, α-Relaxation, BDS, doping
Structure type: oligomer
Location inside paper: p.1518, Fig.1
Compound class: EPS
Contained glycoepitopes: IEDB_114701,IEDB_115136,IEDB_136044,IEDB_136906,IEDB_137472,IEDB_140630,IEDB_141794,IEDB_142488,IEDB_146664,IEDB_151528,IEDB_167188,IEDB_174332,IEDB_190606,IEDB_423153,IEDB_983931,SB_165,SB_166,SB_187,SB_192,SB_195,SB_7,SB_88
Methods: GLC-MS, X-ray, sugar analysis, FTIR, SEM, carboxymethylation, DSC, Broadband Dielectric Spectroscopy (BDS)
Comments, role: The proposed structure of the oligosaccharide isolated after trifluoroacetic acid hydrolysis of the EPS.
Related record ID(s): 3680, 32109
NCBI Taxonomy refs (TaxIDs): 1178
Show glycosyltransferases
There is only one chemically distinct structure:
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Gonzales KN, Troncoso OP, Torres FG, Lopez D
Molecular α-relaxation process of exopolysaccharides extracted from Nostoc commune cyanobacteria
International Journal of Biological Macromolecules 161 (2020)
1516-1525
|
a-D-Ribf-(1-3)-+
|
R-Lac-(2-3)-b-D-GlcpA-(1-6)-b-D-Glcp-(1-4)-a-D-Galp-(1-4)-b-D-Glcp-(1-4)-b-D-Xylp |
Show graphically |
Nostoc commune
(NCBI TaxID 1178,
species name lookup)
Taxonomic group: bacteria / Cyanobacteria
(Phylum: Cyanobacteria)
The structure was elucidated in this paperNCBI PubMed ID: 32755710Publication DOI: 10.1016/j.ijbiomac.2020.07.268Journal NLM ID: 7909578Publisher: Butterworth-Heinemann
Correspondence: Fernando G. Torres <fgtorres
pucp.pe>
Institutions: Department of Mechanical Engineering, Pontificia Universidad Católica del Perú (Lima 32 Perú). Av. Universitaria 1801, Lima 32, Lima, Peru, Institute of Polymer Science and Technology, Spanish Council for Scientific Research (ICTP-CSIC), Madrid, Spain
Broadband dielectric spectroscopy was used to investigate the molecular a-relaxation of the exopolysaccharides (EPS) extracted from Nostoc commune cyanobacteria. The EPS were modified in different ways. EPS were carboxymethylated to obtain carboxymethyl-exopolysaccharides (CEPS). EPS and CEPS were doped with ammonium iodide and 1-butyl-3-methylimidazolium chloride. An a relaxation process was observed for all specimens. The temperature dependence of the relaxation times for pure and doped, EPS and CEPS polymers exhibited non-Arrhenius behavior. This relaxation process was associated with the glass transition of the complex heteropolysaccharides produced by the cyanobacteria. The molecular mobility at the glass transition, Tg, was affected by both the carboxymethylation treatment and the doping. The fragility index also decreased for the doped specimens, which may be attributed to an increase in the mobility of the polymer chains due to the plasticizing effect of the doping agents.
exopolysaccharides, engineering, carboxymethylation, Nostoc commune, α-Relaxation, BDS, doping
Structure type: oligomer
Location inside paper: p.1518, Fig.1
Compound class: EPS
Contained glycoepitopes: IEDB_114701,IEDB_115136,IEDB_136906,IEDB_137472,IEDB_140630,IEDB_141794,IEDB_142488,IEDB_146664,IEDB_149136,IEDB_151528,IEDB_167188,IEDB_174332,IEDB_190606,IEDB_423153,IEDB_983931,SB_192,SB_7
Methods: GLC-MS, X-ray, sugar analysis, FTIR, SEM, carboxymethylation, DSC, Broadband Dielectric Spectroscopy (BDS)
Comments, role: The proposed structure of the oligosaccharide isolated after trifluoroacetic acid hydrolysis of the EPS.
Related record ID(s): 3680, 3681
NCBI Taxonomy refs (TaxIDs): 1178
Show glycosyltransferases
There is only one chemically distinct structure:
Expand this record
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