Effect of Different Nitrogen Concentrationson the Growth, Proximate and Biochemical Composition of Freshwater Microalgae Scenedesmus communis

Fardous Ara Mukta; Helena Khatoon; Mohammad Redwanur Rahman; Mahima Ranjan Acharjee; Subeda Newase; Zannatul Nayma; Razia Sultana; Shanur Jahedul Hasan

Authors

Fardous Ara Mukta Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Helena Khatoon Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Mohammad Redwanur Rahman Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Mahima Ranjan Acharjee Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Subeda Newase Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Zannatul Nayma Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Razia Sultana Department of Aquaculture, Faculty of Fisheries, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh
Shanur Jahedul Hasan Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

Keywords:

Scenedesmus communis, Nitrogen stress, Growth curve, Pigments, Proximate composition, Fatty acid

Abstract

The aim of this study was to improve the growth, proximate and biochemical composition of freshwater microalgae Scenedesmus communis cultured under different NaNO3 concentration. Significantly (p<0.05) maximum cell density (11.6×106 cells/ml), biomass productivity (0.58 g/L), total chlorophyll, protein (23.58 % dry weight) and carbohydrate (27.26 % dry weight) were found in the highest concentration (18.5g/500ml) of NaNO3 compared to control and lower concentration. On the contrary, lowest (6.5g/ 500ml) concentration of NaNO3 resulted in significantly highest lipid 20.92% dry weight, specific growth rate (0.521 ± 0.01 day-1), monounsaturated fatty acids (28.53 % of total fatty acids) and polyunsaturated fatty acids (67.37 % of total fatty acids). In case of carotenoid and total phycobiliprotein content, significantly (p<0.05) higher value of 6.43 mg/L and 6.14 mg/g, respectivelywas produced in control (12.5 g/500 ml NaNO3 ) compared to other concentration of NaNO3 . Significantly (p<0.05) highest value of total saturated fatty acids was found (56.51 %) of total fatty acids in 15.5 g/500ml concentration of NaNO3 . Therefore, it could be concluded that high concentration of NaNO3 boosted the growth and nutritional profile of S. communis. Moreover, lipid production and fatty acid profile was enriched by the lowest concentration of NaNO3 showing economic and sustainability for commercially mass culture of this microalga.