Influence of phenolic acids on the storage and digestion stability of curcumin emulsions based on soy protein-pectin-phenolic acids ternary nano-complexes

Abstract

Aim: To design novel emulsifiers with the ability to improve the storage and digestion stability of curcumin emulsions, besides to investigate the influence of phenolic acids types on the emulsify ability of soy protein-pectin-phenolic acids complexes obtained by ultrasonication.

Methods: The ternary complexes were characterised by particle size, morphology, zeta potential, X-ray diffraction, Fourier transform infra-red and fluorescence spectroscopy. Additionally, changes in droplet size, charge, and microstructure were monitored as quantitative stability index of curcumin emulsions.

Results: Phenolic acid types significantly affected the formation of ternary complexes. Soy protein-pectin-ferulic acid complex (S-P-F) stabilised curcumin emulsion had the best emulsifying property, followed by soy protein-pectin- ellagic acid (S-P-E), and soy protein-pectin-tannic acid complexes (S-P-T). Moreover, S-P-F emulsion was found to retain efficiently cucumin within 30 days storage (77.35%) and simulated gastrointestinal tract (64.09%).

Conclusion: Protein-polysaccharide-phenolic acids emulsions are effective oral delivery systems for hydrophobic bioactives.

Keywords:

• Soy protein
• pectin
• phenolic acids
• ternary complexes
• emulsion

Disclosure statement

The authors report no conflict of interest for this work.

Additional information

Funding

This work was financially supported by National Natural Science Foundation of China (No. 31601415), National Natural Science Foundation of Guangdong, China (No. 2016A030307022), Characteristic innovation project of Higher Education of Guangdong, China (No. 2016KTSCX082), and the Major Programme of Lingnan Normal University (No. LZL1501), and Climbing Peak Programme of Guangdong, China (No. pdjh2019b0300).