Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 43, Pages 12054-12060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b04557
Keywords
enzymatic induction; chitosan-ferulic acid conjugate; beta-lactoglobulin; ternary conjugate; antioxidant activity; thermal behavior
Funding
- National Natural Science Foundation of China [31371835]
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The purpose of current research is to design and acquire novel biological macromolecule materials with enhanced functional properties. Chitosan-ferulic acid binary conjugate (CFC) was synthesized based on the carbodiimide-mediated coupling reaction, and then beta-lactoglobulin-ferulic acid-chitosan ternary conjugate (BFCC) was fabricated by laccase induction. Furthermore, the impact of laccase concentration on the formation mechanism of BFCC was investigated by the analyses of reaction group content, ultraviolet-visible (UV-vis) absorption, circular dichroism (CD), and fluorescence spectroscopy, Results showed that hetero- and homo-conjugates between CFC and beta-lactoglobulin (beta-LG) were achievable at the low concentration (<= 4 U/mL) and high concentration (>= 6 U/mL) of laccase, respectively. The CD spectrum indicated that the interaction with CFC made beta-LG more disorderly. Functional evaluation results revealed that the antioxidant activity and thermal stability of BFCC were improved compared with beta-LG. The knowledge obtained in the present study provided an effective method to acquire innovative biological macromolecule materials with desirable functional characteristics.
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