Journal of Pure and Applied MicrobiologyVol. 6 No. 4

Biodiesel Production and Biotechnological Applications from Microalgae Isolated from Water System of Riyadh, Saudi Arabia

E.N. Sholkamy1, A. Abdel-Megeed1,2, Elnakieb3,4, A.A. Fatma and A. Al-Arfaj1

1Department of Botany and Microbiology, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia. 2Department Plant Protection, Faculty of Agriculture, (Saba Basha), Alexandria University, Egypt. 3Environmental Biotechnology Department Genetic Engineering & Biotechnology Institute. City For Scientific Research and Technology Applications Burg El-Arab, Alexandria, Egypt. 4Public Health Department ,College of Applied Medical Sciences, Science & Arts, KhamisMushat, King Khalid University, Saudi Arabia .

Received on 15 October 2012 and accepted on 28 November 2012

 

ABSTRACT

Microalgae are a potential source of biodiesel. Isolates of the present study were isolated from Wadi-henifa, Rhiyad, Saudi Arabia. The urgent need for an alternative and sustainable energy has created renewed interest to analyse the microalgae for biodiesel production. The greatest lipid content reached 20.2, 16.4, 9.7 and 12.3 % under the optimal conditions of nitrate concentration (0.75 g/l), temperature (24 and 30 C), salinity (0.05 and 0.001 mole/l) and pH (8 with Chlorellavulgarus and 9 with other strains), Chlorella vulgarusArthrospiraplatensisGomont and Spirulina major, respectively. It was demonstrated that the obtained model was effective for predicting lipid productivity of the isolated microalgae. The maximum protein content was at 24C for Chlorella vulgarus,ArthrospiraplatensisGomont and Spirulinamajork?tz, (53, 56.8 and 54 % respectively), while the maximum protein content ofArthrospira maxima was at 30C (56.2 %).The optimum protein content was found at pH9forArthrospiraplatensisGomont , Spirulina major k?tzandArthrospira maxima(48.47, 55.47 and 63.25 % respectively) while in case of Chlorella vulgaruswas at pH 8 (51 %).The maximum protein content was 76.96 % at 0.001 moleNacl/L, 54, 75.38 and 75.09 % at 0.05 mole/L for Chlorella vulgarus,Spirulina major k?tz, Arthrospira maxima andArthrospiraplatensisGomont respectively. Results of this study revealed thatthe mention optimization conditions enhanced protein content of the tested isolates. ArthrospiraplatensisGomont, Spirulinamajork?tzandArthrospira maxima are promising organisms with high nutritional value for animal and human beings.

Keywords : Arthrospira, Biomass, Salinity