Effects of Culture Conditions on Growth and Biochemical Profile of Chlorella Vulgaris
نویسندگان
چکیده
Chlorella is the most cultivated eukaryotic green micro alga, as it is widely used as a health food and feed supplement, as well as in the pharmaceutical and cosmetics industry. It contains proteins, carotenoids, lipids, immunostimulator compounds, polysaccharides, vitamins, antioxidants and minerals. The growth of algae is a function of many factors, including nutrients, pH, salinity, temperature and light (duration and intensity). Among these factors, the light that directly influences photosynthetic mechanism is an important factor in defining optimal conditions for the culture [1]. In the presence of non-limiting nutrients, the efficiency of microalgal culture remains controlled, mainly by light intensity and temperature. Photosynthesis of phytoplankton is influenced by natural factors, such as temperature and irradiance [2]. These factors influence the nutritional value of phytoplankton such as protein, carbohydrate, lipid, amino acid and pigments composition [3]. These specific chemicals attributes will not follow similar trends with changing temperature and light conditions [4]. The effects of irradiance and photoperiod on the biomass and fatty acid composition of Chlorella vulgaris, were also examined [5]. It has been long known that direct sunshine is harmful to algal cultures. Under natural conditions, receiving direct rays of the sun rarely fall on an alga, and a few centimeters of interposed water are sufficient to reduce the harmful effects. In the natural habitats, algae grow predominantly in diminished light; hence cultures should be placed in the window, where direct sun light could be avoided.
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