Construction, structural characterization and digestion characteristics of oyster peptides delivery system based on nano-calcium carbonate

  • WANG Jing ,
  • ZHANG Mengmeng ,
  • ZHANG Zhuoqian ,
  • CAO Wenhong ,
  • TAN Mingtang ,
  • ZHU Guoping ,
  • GAO Jialong ,
  • LIN Haisheng ,
  • ZHENG Huina ,
  • CHEN Zhongqin
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  • 1(College of Food Science and Technology, Guangdong Ocean University, National Research and Development Branch Center for Shellfish Processing (Zhanjiang), Guangdong Provincial Key Laboratory of Aquatic Products Processing and Safety, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Province Engineering Laboratory for Marine Biological Products, Guangdong Provincial Engineering Technology Research Center of Prefabricated Seafood Processing and Quality Control, Zhanjiang 524088, China)
    2(Shenzhen Institute of Guangdong Ocean University, Shenzhen 518120, China)

Received date: 2025-04-09

  Revised date: 2025-05-30

  Online published: 2025-11-03

Abstract

Oyster bioactive peptides (OBP) exhibit multiple biological activities including antioxidant, hypoglycemic, and hypolipidemic effects.However, the poor stability of OBP in gastrointestinal environments significantly limits their efficacy.To enhance the stability of OBP and reduce the waste of oyster shell resources, this study first synthesized nano-calcium carbonate (CaCO3 NPs) from oyster shell.The CaCO3 NPs were then modified with sodium alginate (ALG), and the modification process was optimized.Subsequently, OBP was loaded onto ALG-CaCO3 NPs, followed by polyethylene glycol modification, to construct an OBP-CaCO3 NPs nano-system.Finally, the study investigated the structural stability, in vitro release, and digestive characteristics of the nano-system.The orthogonal experimental results indicated that the optimal modification process parameters for CaCO3 NPs were:ALG concentration of 5 mg/mL, temperature of 35 ℃, and reaction time of 2 h.The nano-system showed an average particle size of (288.7±7.6) nm and zeta potential of (-30.5±0.8) mV, achieving encapsulation efficiency of (35.69±2.22)% and loading capacity of (19.71±1.60)%.Fourier transform infrared spectroscopy analysis revealed that ALG modified CaCO3 NPs by forming an ‘egg box’ structure through the cross-linking of carboxyl group and Ca2+, while OBP were loaded inside the carrier through electrostatic effect.The results of in vitro release experiments showed that the cumulative release rate of the nano-system in the simulated gastric environment (pH 2.0) for 36 hours was only (40.31±0.63)%, while the release rate in the intestinal environment (pH 6.8) significantly increased to (93.12±3.76)%, indicating the nano-system had the characteristics of targeted intestinal slow release.Digestion stability experiments demonstrated that the nano-system could significantly improve the pancreatic lipase inhibitory activity of OBP, the inhibitory rate increased from (23.66±0.93)% to (54.73±1.37)% after gastric digestion, and from (4.75±0.38)% to (24.67±1.31)% after gastrointestinal digestion.This study provides theoretical support for the design of stable delivery systems for functional peptides, while offering a novel approach for the high-value utilization of oyster shell waste.

Cite this article

WANG Jing , ZHANG Mengmeng , ZHANG Zhuoqian , CAO Wenhong , TAN Mingtang , ZHU Guoping , GAO Jialong , LIN Haisheng , ZHENG Huina , CHEN Zhongqin . Construction, structural characterization and digestion characteristics of oyster peptides delivery system based on nano-calcium carbonate[J]. Food and Fermentation Industries, 2025 , 51(19) : 238 -247 . DOI: 10.13995/j.cnki.11-1802/ts.042967

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