Abstract：
:The interaction between xanthan and selected bivalent cations (Ca2+, Mg2+, Mn2+, Fe2+, Cu2+, Zn2+, Cd2+ and Pb2+) was studied by means of conductometry, viscometry, and nuclear magnetic resonance spectroscopy. Xanthan from Xanthomonas campestris was studied in comparison with dextran from Leuconostoc mesenteroides. While dextran does not develop specific interactions with the bivalent cations, the analysis of the experimental data shows that xanthan chains (Mn approximately 1.4x10(5) to 2.9x10(6) g/mol) reversibly bind Me2+ species in aqueous solution at pH 6. Conductometric and viscometric titrations show that a single bivalent cation forms a complex which involves two disaccharide units of the main chain together with two side chains. Based on dipolar magnetic interactions between Mn2+ and individual carbon positions of xanthan, a possible structure of a chelate-like complex is proposed which involves the pyruvate units at the terminal ends of the side chains as the main binding sites. According to the stoichiometric relation between cations and disaccharide units, a single bivalent cation is bound between the terminal ends of two side chains, leading to an intramolecular cross-link and a reduced hydrodynamic radius of the overall macromolecule. The results indicate that heavy metal ions (Cd2+ and Pb2+) link stronger to the xanthan chain than lighter cations (Ca2+ and Mg2+), a fact which may be of ecological relevance.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Bergmann D,Furth G,Mayer Cdoi
10.1016/j.ijbiomac.2008.06.001subject
Has Abstractpub_date
2008-10-01 00:00:00pages
245-51issue
3eissn
0141-8130issn
1879-0003pii
S0141-8130(08)00124-4journal_volume
43pub_type
杂志文章abstract：:Abundance, cheapness, biodegradability and non-toxic behaviour of starches attract many food and non-food industries. Starch provides viscosity, adhesion, texture and homogeneity to various food products. This review article deals with the chemical composition, structure, granular morphology, pasting, thermal and in v...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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pub_type： 杂志文章,评审
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journal_title：International journal of biological macromolecules
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abstract：:Starch nanoparticles (SNPs) have become one of the most interesting nanocarriers due to their relatively easy synthesis, biocompatibility, and biodegradability. However, the practical applications of SNPs are limited, as their aggregation reduce their functionality. Here, SNPs obtained by recrystallizing debranched wa...
journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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abstract：:Bacillus nealsonii PN-11 produces thermo-alkalistable mannanase and protease active in wide temperature and pH range. Optimization of coproduction of protease and mannanase from this strain and application of cocktail of these enzymes as detergent additives were studied. On optimization mannanase yield of 834Ug-1 (11....
journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2012.09.007
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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更新日期：2020-07-15 00:00:00
abstract：:Owing to the excellent cyto-compatibility of silk fibroin (SF) and the simple fabrication of nano-fibrous webs, electro-spun SF webs have attracted much research attention in numerous biomedical fields. Because the production rate of electro-spun webs is strongly dependent on the electro-spinning rate used, the electr...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章
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journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/j.ijbiomac.2007.05.004
更新日期：2007-10-01 00:00:00
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
pub_type： 杂志文章
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更新日期：2011-01-01 00:00:00
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
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abstract：:Polyhydroxyalkanoates (PHAs) belong to a family of natural polyesters and are produced under unbalanced growth conditions as intracellular carbon and energy reserves by a wide variety of microorganisms. Being biodegradable, biocompatible and environmental friendly thermoplastics, the PHAs are considered as future poly...
journal_title：International journal of biological macromolecules
pub_type： 杂志文章,评审
doi：10.1016/j.ijbiomac.2019.08.147
更新日期：2019-11-01 00:00:00
