Structural characterization and formation mechanism of zein-propylene glycol alginate binary complex induced by calcium ions.
Food Res Int
; 100(Pt 2): 57-68, 2017 10.
Article
em En
| MEDLINE
| ID: mdl-28888459
ABSTRACT
Effect of calcium ions (Ca2+) on characteristics of zein-propylene glycol alginate (PGA) binary complex was studied in this work. Ca2+ induced the formation of zein aggregates with decreased fluorescence intensity and a significant α-helix loss of zein. Zein-PGA binary complex with Ca2+ showed the decreased dimension and the minimum size was observed at 50.0mM Ca2+. Ca2+ resulted in the formation of strong hydrogen bonds between zein and PGA, strengthened their hydrophobic interactions, and induced a new peak at the diffraction angle of 30° in the pattern of Zein-PGA binary complex. PGA fortified with Ca2+ exhibited an overall plane-like structure, also an interwoven flat profile appeared in Zein-PGA binary complex with Ca2+. Three potential mechanisms were proposed to explain the morphological changes of samples after Ca2+ addition (i) particle-particle collision and aggregation of particles; (ii) chain-chain association and further cross-linking of associated chains; (iii) simultaneous cross-linking coupled with aggregation.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Zeína
/
Cálcio
/
Alginatos
/
Íons
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article