Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (7): 2317-2325.doi: 10.11843/j.issn.0366-6964.2022.07.028

• BASIC VETERINARY MEDICINE • Previous Articles     Next Articles

Preparation of Microencapsulated Salmonella SP4 Bacteriophage and the Study on Its Slow-release Performance

ZHANG Bo1, ZHANG Yongying1, HAO He1, ZHANG Yibo1, LV Xingbang1, ZHU Shouchuang1, ZHU Zhen1, SHI Yuxiang1,2*   

  1. 1. College of Life Science and Food Engineering, Hebei University of Engineering, Handan 056000, China;
    2. Engineering Research Center for Poultry Diseases of Hebei Province, Handan 056000, China
  • Received:2021-10-12 Online:2022-07-23 Published:2022-07-23

Abstract: Microencapsulated SP4 phage was prepared by using cationic etherified starch/sodium alginate/xanthan gum/nano TiO2/chitosan oligosaccharide as raw materials, to provide biological agents for controlling Salmonella infection. Salmonella SP4 phage was used to prepare microencapsulated SP4 phage by droplet method, and its titer, cationic etherified starch concentration, sodium alginate concentration, xanthan gum concentration, chitosan oligosaccharide concentration, pH stability, thermal stability, simulated gastric juice stability, simulated intestinal juice release behavior and preservation stability were analyzed. The results showed that when the concentration of cationic etherified starch was 2.4%, the concentration of sodium alginate was 2%, the concentration of xanthan gum was 1%, and the concentration of chitosan oligosaccharide was 0.6%, the shape of microencapsulated SP4 phage microspheres was regular, and the encapsulation efficiency was 97.5%. The phage maintained high biological activity in the range of pH 5.0-8.0, temperature 10-30℃, simulated gastric juice pH 2.0 for 0-30 min and pH 3.0 for 0-150 min. The phage was completely released after 4 h in simulated intestinal juice, and the phage titer did not decrease significantly after 6 weeks at 4℃. The results show that microencapsulated Salmonella SP4 phage significantly improves the stability and sustained-release performance of phage, its acid resistance is conducive to resisting the decomposition of gastric acid, and has the potential to be used in biological control, which lays a foundation for the further identification of microencapsulated Salmonella SP4 phage by multi factor test.

Key words: SP4 phage, microencapsulated coating, stability, slow release performance, biological agent

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