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Protein Quality of Various Algal Biomasses Produced by a Water Reclamation Pilot Plant¹

North American Rockwell Corporation, El Segundo, California

A study was made to evaluate the protein quality of 7 algal biomasses produced by a water-reclamation experimental plant. The protein efficiency ratios obtained ranged from 0.68 to 1.98. The biomass with the highest protein quality compared favorably with soybean meal. The nitrogen balance experiments suggest that the variation was due largely to digestibility differences, and to a lesser extent to differences in nitrogen retention. The factors responsible for these differences were not determined in these experiments, but the importance of trying to control these factors is apparent if a consistently good quality product is to be obtained. The protein quality of Chlorella grown on a chemically defined medium was determined. The effects of storage and moist heat on the protein quality of algae were also evaluated.

Manuscript received 21 February 1968.