Interaction between Negatively Charged Fish Gelatin and Cyclodextrin in Aqueous Solution: Characteristics and Formation Mechanism

Author:

Fang QiORCID,Ma Nao,Ding Keying,Zhan Shengnan,Lou Qiaoming,Huang TaoORCID

Abstract

The effect that ratios of fish gelatin (FG) to α/β/γ cyclodextrins (α, β, γCDs) had on the phase behavior of a concentrated biopolymer mixture were comparatively investigated. This showed that the formed biopolymer mixture had the highest gel strength at ratios of FG–CD = 90:10. FG could interact with CDs to form stable soluble complexes with lower values of turbidity, particle size and ζ-potential. All of the FG–CD mixture solutions exhibited pseudo-plastic behaviors, and FG–αCD samples had the highest viscosity values than others. The addition of CDs could unfold FG molecules and make conformation transitions of FG from a random coil to β-turn, leading to the environmental change of hydrophobic residues and presenting higher fluorescence intensity, especially for βCDs. FTIR results revealed that the formation of intermolecular hydrogen bonds between FG and CD could change the secondary structure of FG. These findings might help further apply FG–CD complexes in designing new food matrixes.

Funder

National Natural Science Foundation of China

Zhejiang Province Public Welfare Technology Application Research Project

Natural Science Foundation of Ningbo

Open Project Program of State Key Laboratory of Food Science and Technology, Nanchang University

Publisher

MDPI AG

Subject

Polymers and Plastics,Organic Chemistry,Biomaterials,Bioengineering

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