Control of Protein Level of Algae, Chlorella

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Abstract
SUMMARY: Chlorella pyrenoidosa No. 71105, grown under limited nitrate conditions (1mM NO‐s) had protein levels of 21–6470 of the total dry weight when grown in continuous culture, and only 5–20% protein when grown as stationary cultures. Light limited both the protein fixation and the total production of dry algal tissue. Protein per liter increased with light, but at a slower rate than total dry weight, resulting in yields of greater protein per liter but cells of lower percentage of protein. Up to limiting concentrations of nitrate the algal yield (dry matter) was directly proportional to light received. The conversion of light energy to net chemical energy was between 3 and 13%.