کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5767827 | 1413206 | 2017 | 12 صفحه PDF | دانلود رایگان |
- Calcium ions (Ca2 +) led to the formation of zein aggregates with the loss of α-helix.
- Strong hydrogen bonding was formed between zein and propylene glycol alginate (PGA).
- An interwoven flat structure was observed for Zein-PGA binary complexes with Ca2Â +.
- Three formation mechanisms were proposed for Zein-PGA binary complexes induced by Ca2Â +.
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 50.0 mM 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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Journal: Food Research International - Volume 100, Part 2, October 2017, Pages 57-68