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Encapsulation of Folic Acid and α -Tocopherol in Lysozyme Particles and Their Bioaccessibility in the Presence of DNA.

Lingling MaTiecheng GaoHao ChengNing LiWeining HuangLi Liang
Published in: Antioxidants (Basel, Switzerland) (2023)
Protein particles have been reported as the potential carriers for the co-encapsulation of bioactive components. In this study, lysozyme, a basic protein, was used to simultaneously encapsulate folic acid and α -tocopherol at pH 4.0. The encapsulation efficiency and loading capacity of folic acid or α -tocopherol increased with its respective concentration. Folic acid had no influence on the encapsulation of α -tocopherol. However, the encapsulation of folic acid was improved by α -tocopherol below 40 μg/mL but reduced by α -tocopherol at higher concentrations. The encapsulation by lysozyme shielded folic acid, α -tocopherol, or both partially from the attack of 2,2'-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) radical cation. No masking effect of lysozyme encapsulation on α -tocopherol was found in DPPH antioxidant activity assay. Furthermore, the DNA coating was used to improve the dispersion of lysozyme with folic acid and α -tocopherol. The lysozyme/DNA particles with folic acid and α -tocopherol showed a homogenous size distribution of 180-220 nm with ζ-potential values between -33 and -36 mV. The release and bioaccessibility of folic acid in lysozyme/DNA with α -tocopherol were similar to that of folic acid alone, while the release of α -tocopherol was delayed and its bioaccessibility was improved by encapsulation in lysozyme/DNA with folic acid. The data gathered here would provide guidance for the use of lysozyme-based co-encapsulating carriers in the development of functional foods.
Keyphrases
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