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Functional changes in β-lactoglobulin by conjugation with carboxymethyl cellulose
Tatsuya Arai1,2, Moeko Ono2, Maiko Yoneda2
1Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan.
Cytotechnology
|March 18, 2025
Summary
Conjugating beta-lactoglobulin (BLG) with carboxymethylcellulose (CMC) improves its emulsifying properties and reduces immunogenicity, especially when using high molecular weight CMC for food applications.
Area of Science:
- Food Science
- Biochemistry
- Materials Science
Background:
- Beta-lactoglobulin (BLG) is a major whey protein with functional properties valuable in food.
- BLG's application is limited by its poor emulsifying capacity in acidic conditions and presence of salt, and its immunogenicity.
- Carboxymethylcellulose (CMC) is a polysaccharide with potential for modifying protein functionality.
Purpose of the Study:
- To conjugate BLG with CMC using EDC to enhance BLG's functional properties.
- To investigate the impact of CMC content and molecular weight on BLG-CMC conjugate characteristics.
- To evaluate the improved emulsifying properties and reduced immunogenicity of BLG-CMC conjugates for food applications.
Main Methods:
- Conjugation of BLG and CMC using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC).
- Characterization of BLG-CMC conjugates using SDS-PAGE, CD spectroscopy, and fluorescence spectroscopy.
- Assessment of retinol-binding activity and antibody binding affinity (ELISA).
- Evaluation of emulsifying properties under acidic pH and salt conditions.
- Assessment of immunogenicity in BALB/c mice.
Main Results:
- Successful conjugation of BLG with CMC was confirmed by SDS-PAGE.
- Secondary structure and tryptophan conformation of BLG were largely maintained.
- Retinol-binding site and specific antibody epitopes (around 125Thr-135Lys) were altered.
- Emulsifying properties of BLG were significantly improved in acidic pH and high salt conditions.
- Immunogenicity of BLG was reduced in mice, particularly with high molecular weight CMC.
- BLG-high molecular weight CMC conjugates showed marked improvements in emulsification and reduced immunogenicity.
Conclusions:
- Conjugation with CMC is an effective strategy to enhance the functional properties of BLG for food applications.
- High molecular weight CMC is preferable for achieving superior emulsifying properties and reduced immunogenicity.
- BLG-CMC conjugates offer a promising avenue for developing improved food ingredients with enhanced stability and safety.
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