Metal ions have been considered as an important factor on fibrils assembly. Herein, a comprehensive analysis of specific ions effect on fibril formation and structural changes was investigated. The addition of ions (except Zn) accelerated the aggregation kinetics of rice glutelin fibrils (RGFs) from 0.93 to 1.28-2.19 h. In addition, the fibrillization rate followed the order of NH > Li > Na > K > Cu > Mg > Ca > Zn. The highest yield and length of fibrils were observed with Ca, probably due to the ionic bridging effect and hydrated capacity of Ca. However, Cu reduced the fibrils yield, which was attributable to the fact that Cu disrupted β-sheet structure and inhibited the transition of monomer to fibrils. The polymorphism of fibrils was observed with different salts, and the light metals presented a superior effect on fibrils formation than heavy metals. Overall, this work will provide a further information into how to tune the structure of RGFs using various ions.
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| http://dx.doi.org/10.1016/j.foodchem.2023.138351 | DOI Listing |
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