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    The Effect of Temperature on Protein and Amino Acid Composition of Spirulina platensis
    (Ege Univ, 2009) Uslu, Leyla Hizarci; Isik, Oya; Sayin, Selin; Durmaz, Yasar; Goksan, Tolga; Gokpinar, Sevket
    The purpose of this study was to clarify the seasonal variation of protein content and amino acid composition of Spirulina platensis grown in summer and winter. During the study, while the light intensity, pH and salinity were measured daily, the temperature and dissolved oxygen were measured during daytime and at night. While the mean day temperatures were recorded as 33.9 +/- 0.4 degrees C and 18.6 +/- 0.5 degrees C, the mean night temperatures were found to be 29.9 +/- 0.2 degrees C and 14.4 +/- 0.2 degrees C in summer and winter, respectively. The mean light intensity of 848.3 mu mol m(-2)s(-1) was determined in summer. It was 506.26 +/- 48 mu mol m(-2)s(-1) in winter. The protein amount (72.9 +/- 03 %) and the amino acid concentrations of S. platensis grown in summer were found to be higher than in winter. Some of the amino acids, Prolin, Sistin, and Arginine observed in winter, only.
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    Öğe
    The Effect of the Environmental Factors on the Vitamin C (Ascorbic Acid), E (Alpha-tocopherol), ?-carotene Contents and the Fatty Acid Composition of Spirulina platensis
    (Ege Univ, 2006) Isik, Oya; Hizarci, Leyla; Sayin, Selin; Gokpinar, Sevket; Durmaz, Yasar; Goksan, Tolga
    The purpose of this study was to clarify the seasonal variation of vitamin C (ascorbic acid), E (alpha-tocopherol), beta-carotene contents and fatty acid composition of Spirulina platensis grown in the ponds in the subtropic area. While the light intensity, pH and salinity were measured daily, the temperature and dissolved oxygen were measured in day and night. The mean day temperatures were 33.9 +/- 0.4 degrees C in summer and 18.6 +/- 0.5 degrees C in winter. The mean night temperatures were measured 29.9 +/- 0.2 degrees C and 14.4 +/- 0.2 degrees C in summer and winter, respectively. The mean light intensity of 848.3 mu mol/m(2)/s was determined in summer. It was 506.26 +/- 48 mu mol/m(2)/s in winter. The vitamin C content (39.31 +/- 3.63 mg/100 g) of S. platensis grown in winter was found to be higher than in summer. The alpha-tocopherol content (6.57 +/- 1.18 mg/100 g) was higher in summer. However, -carotene contents were found to be similar both in summer and winter. Fatty acid composition was affected from the ambient factors significantly. The higher.-linolenic acid content (22.221 +/- 0.388 %) was found in summer.
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    Öğe
    The effects of nitrogen deficiencies on the lipid and protein contents of Spirulina platensis
    (Academic Journals, 2011) Uslu, Leyla; Isik, Oya; Koc, Kemal; Goksan, Tolga
    Nitrogen deficiencies were studied in Spirulina platensis ( Cyanophyceae) with the aim of determining the effects of the 50 and 100% deficient nitrogen on the lipid and protein contents of the cell under laboratory conditions. S. platensis cultures were grown in Spirulina medium and kept at the constant room temperature of 26 +/- 2 degrees C, illuminated with fluorescent lamps at an irradiance level of 80 mu mol m(-2) s(-1) with photoperiod 16:8 (L:D) and aerated continuously. In the Spirulina biomass harvested at the stationary phase, 67.4, 53.5, 5.6% protein and 5.78, 13.66, 17.05% lipid were recorded for the groups of control, 50% N(-) and 100% N(-), respectively. The highest lipid content and 1.00 gL(-1) dry-weight were recorded from the culture to which treated 100% N(-).