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Glycation from α-dicarbonyl compounds has different effects on the heat-induced aggregation of bovine serum albumin and β-casein

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  • Di Zhao, Nanjing Agricultural University
  • ,
  • Bulei Sheng
  • Hao Li, Nanjing Agricultural University
  • ,
  • Yi Wu, South China University of Technology
  • ,
  • Dan Xu, South China University of Technology
  • ,
  • Chunbao Li, Nanjing Agricultural University

α-Dicarbonyl compounds are generated in large amounts during heat treatment in food production. This work compared the influence of glycation by α-dicarbonyl on the hydrothermal aggregation of bovine serum albumin (BSA) and of β-casein (β-CN). Glycation by α-dicarbonyl compounds was found to be more efficient than glycation by glucose in reducing the free amino groups, surface hydrophobicity and isoelectric point of BSA, thus greatly inhibited the hydrothermal aggregation of BSA. In addition, glycation by α-dicarbonyl greatly transformed the rigid BSA aggregates into flexible structures, based on analysis by fluorescence spectrum, transmission electron microscope and small-angle X-ray scattering. In contrast, both the aggregation process and aggregates conformation of β-CN were found to be minimally affected by glycation, possibly due to the intrinsic disorder of β-CN. This work highlights the substantial influences of α-dicarbonyl on dietary proteins during heat treatment depending on the protein structural characteristics.

Original languageEnglish
Article number128108
JournalFood Chemistry
Volume340
Number of pages9
ISSN0308-8146
DOIs
Publication statusPublished - Mar 2021

    Research areas

  • Aggregation, Bovine serum albumin, Glycation, α-Dicarbonyl compounds, β-Casein

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