Chemical compositions of Ethiopian native strains of Limnospira fusiformis cultured with anaerobic digestion effluent from water hyacinth

The demand for functional and nutritional food is surging worldwide, reflecting the developing awareness of the role of food in maintaining good health. It is crucial to ensure that diets are rich in bioactive properties to help prevent and even treat chronic viral diseases. Recently, Limnospira (Spirulina) has attracted attention for its strong potential as a valuable food supplement for preparing high-nutritional foods. It contains numerous valuable biomolecules, such as proteins, carbohydrates, vitamins, pigments, and antioxidants. This study focused on the biochemical compositions of four native Ethiopian strains of L. fusiformis using anaerobic digestion effluent (ADE) from water hyacinth overgrown in Lake Tana, Ethiopia. Even though the 8-fold diluted ADE contained a limited amount of phosphate, the maximum algal biomass yields reached up to 0.63 g/L, 0.61 g/L, 0.52 g/L, and 0.51 g/L from Lc-30, La-08, Lc-30, La-32, and Lc-30 strains, respectively. The percentage contents of total carbohydrates and dietary fibers were 36-46% and 2-7% of the total dry biomass, respectively, higher than in the standard Spirulina medium. Photosynthetic performance was also greater in the algae grown in 8-fold diluted ADE than in the standard medium. At the end of the six-day cultivation period, phosphate and ammonium removal rates were >90% in all the strains except for La-32. These results suggest that cultivating Limnospira using ADE from overgrowing aquatic weeds can mitigate future food and biofuel demand through nutrient recycling via sustainable utilization of macrophytes.

Presentation Preference: Poster

Primary Presenter: Most Fahima Ahmed Anny, Jahangirnagar University (mfa.anny81@gmail.com)

Authors:

Most Fahima Ahmed Anny, The University of Shiga Prefecture/ Jahangirnagar University  (mfa.anny81@gmail.com)

Taiabur Rahman Tuhin, The University of Shiga Prefecture  (tuhin.rahman78@gmail.com)

Xin Liu, Guangxi Key Laboratory of Aquatic Biotechnology and Modern Ecological Aquaculture/ The University of Shiga Prefecture  (liuxin.rk@gmail.com)

Ayirkm Adugna Woldie, Soka University/ Injibara University  (ayirkmadugna@soka.gr.jp)

Tatsuki Toda, Soka University  (toda@soka.ac.jp)