Abstract
The influence of the molecular structures of flavor compounds (specifically, variations in chain length and functional groups) on the binding of the flavor compounds (Z)-2-penten-1-ol, hexanal, and (E)-2-octenal to pea protein was investigated. The results showed that the molecular structures of the flavor compounds strongly influenced their binding affinity for pea protein. Specifically, (E)-2-octenal exhibited a higher binding affinity and a higher Stern–Volmer constant with pea protein than both hexanal and (Z)-2-penten-1-ol. Thermodynamic analysis indicated that the flavor compound–pea protein interactions were spontaneous. Hydrophobic interactions were dominant in the non-covalent interactions between (E)-2-octenal/(Z)-2-penten-1-ol and pea protein, whereas hydrogen bonding was dominant in the non-covalent interactions between hexanal and pea protein. Surface hydrophobicity measurements, the use of bond-disrupting agents, and molecular docking further supported the hypothesis that hydrogen bonding, as well as hydrophobic interactions, occurred between the flavor compounds and pea protein.
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