DOI QR코드

DOI QR Code

Improvement in microbial stability of photosynthetic bacteria via optimized cell immobilization and lyophilization: Application to the treatment of shrimp aquaculture water

  • 투고 : 2022.11.18
  • 심사 : 2022.12.21
  • 발행 : 2022.12.30

초록

Photosynthetic bacteria (PSB) play an important role in water purification, and their application is beneficial for sustainable aquaculture. However, maintaining the microbial stability of PSB from subculturing to preservation is a challenging task. Since improvement in the microbial stability of PSB is a crucial parameter, optimized conditions for cell immobilization and lyophilization were investigated. In PSB immobilization, 0.1-M CaCl2 was found to be the most effective divalent metal ion solution in terms of cost-effectiveness, resulting in beads with a 4-mm diameter and high loading (1.91×109 CFU/mL) of viable cells. Maintenance of cell viability, external appearance, and color of PSB beads was best in 3.5% NaCl during storage. In lyophilization, the addition of skim milk (9%) and dextrose (2%) as cryoprotective additives allowed the highest cell viability. Over an 18-week shrimp breeding period, when optimally manufactured beads and lyophilized powder of PSB were applied to shrimp aquaculture water, NH4+, NO3-, and NO2- were more effectively removed by 55%, 100%, and 100%, respectively, compared to controls. Thus, microbial stability of PSB through optimized cell immobilization and lyophilization was successfully enhanced, enabling a wide application.

키워드

과제정보

We are grateful to Ecobiznet Company (Chuncheon, Gangwon-do, Korea) for invaluable assistance in providing photosynthetic bacterial species, culture media and reactors for the present study.

참고문헌

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