Optimization of Growth Conditions and Biochemical Composition of Microchloropsis salina , Cultured with Three Macroalgal
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Optimization of Growth Conditions and Biochemical Composition of Microchloropsis salina, Cultured with Three Macroalgal Aqueous Extracts Mohamed S. Abdel-Kareem 1 & Soad M. Mohy El.Din 1
&
El-Sayed M. Ibrahim 1
Received: 13 November 2019 / Revised: 8 May 2020 / # Springer Nature Switzerland AG 2020
Abstract The utilization of microalgae for the production of numerous biotechnological products is growing in importance and there are several large production systems for microalgae. Meanwhile, their production is subjected to high cost problems, and the need for clean and low-cost production demands many investigations on algal physiological response under different growth conditions. We investigated the growth, biomass, and biochemical composition of Microchloropsis salina using different concentrations of Ulva linza, Pterocladia capillacea and Sargassum hornschuchii aqueous extracts against conventional f/2 medium. M. salina was successfully cultured using the tested seaweed extracts and exhibited higher cell density and biomass when seaweed extracts were used as a supplement or an alternative medium. The growth of M. salina was optimized through the manipulation of several algal cultivation conditions such as light intensity, light/dark cycles, salinity and pH. When P. capillacea aqueous extracts were used as an alternative medium, microalgal recorded the highest values of total chlorophylls, total carotenoids and total carbohydrates. The maximum value of total lipids was recorded at S. hornschuchii extract, and the maximum value of total proteins was recorded at U. linza extract, compared with control (f/2 medium). Data are statistically significant at p < 0.05, according to the analysis of variance. In conclusion, we believe that the seaweed aqueous extracts evaluated in this study are able to provide the necessary inorganic nutrients and minerals for tested species growth and could be used as a cost-effective media in establishing microalgal populations. Keywords Seaweed aqueous extracts . Microchloropsis salina . f/2 medium . Changing growth to algae culture . Biochemical composition
Introduction Algae are a diverse group of photosynthetic organisms. They are classified according to morphology and size into main groups: macroalgae and microalgae. Macroalgae consist of multiple cells that organize into structures look like the roots, stems, and leaves of higher plants (e.g., kelp). Microalgae are group of primary producers present in almost all ecosystems on earth, ranging from marine, fresh-water, desert sands, and hot springs, to snow and ice (Guschina and Harwood 2006). Seaweeds (macroalgae) are commercially important marine living and renewable resources in many parts of the
* Soad M. Mohy El.Din [email protected] 1
Botany and Microbiology Department, Faculty of Science, Alexandria University, Alexandria, Moharam Bey 21511, Egypt
world, which can be utilized for many purposes. They are source of minerals, proteins, vitamins, bioactive substances and secondary metabolites with economic importanc
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