Title:A Novel Low Molecule Peptides-calcium Chelate from Silkworm Pupae Protein
Hydrolysate: Preparation, Antioxidant Activity, and Bioavailability
Volume: 29
Issue: 9
Author(s): Xiao-Meng Xun, Zhi-Ang Zhang, Zi-Xuan Yuan, Kamila Tuhong, Cheng-Hai Yan, Yu-Fan Zhan, Si-Jie He, Shun-Hui Liu, Guo-Ping Kang and Jun Wang*
Affiliation:
- Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, School of Biotechnology, Jiangsu University of Science and
Technology, Zhenjiang, Jiangsu, 212100, P.R. China
- Attached Silkworm Medicine Factory, Sericultural Research Institute,
Chinese Academy of Agricultural Sciences, Zhenjiang, Jiangsu, 212100, P.R. China
- Key Laboratory of Silkworm and Mulberry
Genetic Improvement, Ministry of Agriculture and Rural Affairs, Sericultural Research Institute, Chinese Academy of Agricultural
Sciences, Zhenjiang, Jiangsu, 212100, P.R. China
Keywords:
Silkworm pupae protein hydrolysate, calcium chelating, DPPH radical scavenging activity, digestion, Caco-2 cell, antioxidant.
Abstract:
Background: The antioxidant properties of active peptides from silkworm pupae protein hydrolysate
are of interest, and it serves as a novel source of calcium supplement.
Methods: Optimize the preparation parameters of silkworm pupae bioactive peptide-calcium chelate, and investigate
the mechanism and bioavailability of silkworm pupae active peptide as a transport carrier to promote calcium
ion absorption using simulated gastrointestinal digestion and Caco-2 monolayer cell model.
Results: The optimal process parameters for preparing peptide calcium chelate were the peptide calcium mass
ratio of 3:1, pH of 6.7, a temperature of 35.6°C, and time of 32.8 min by Box-Behnken design, and the calciumchelating
rate reached 84.67%. The DPPH radical scavenging activity of silkworm pupae protein hydrolysatecalcium
chelate was 79.36 ± 4.31%, significantly higher than silkworm pupae protein hydrolysate (61.00 ±
9.56%). Fourier transform infrared spectroscopy shows that the COO-, N-H, C-H, and C-O groups participated
in the formation of silkworm pupae protein hydrolysate-calcium chelate. The particle size of the silkworm pupae
protein hydrolysate-calcium chelate was 970.75 ± 30.12 nm, which was significantly higher than that of
silkworm pupae protein hydrolysate (253.14 ± 5.72 nm). The silkworm pupae protein hydrolysate-calcium chelate
showed a calcium dissolution rate of 71.01 ± 1.91% in the simulated intestinal phase, significantly higher
than that of CaCl2 (59.34 ± 1.24%). In the Caco-2 cell monolayers, the silkworm pupae protein hydrolysatecalcium
chelate was more favorable for calcium transport.
Conclusion: A novel silkworm pupa protein hydrolysate-calcium chelate with high antioxidant activity was
successfully prepared to improve the bioavailability of calcium.