Free amino acids of the haemolymph of Schistocerca gregaria Forsk

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Abstract
Seventeen free amino acids were identified in the whole blood of normal pigmented and of albino locust Schistocerca gregaria. No significant differences in the content of free amino acids were found during nymphal development and sexual maturation except a decrease in total free amino acids in the bldest animals. Glycine, proline, glutamic acid and glutamine represent the largest part of the free amino acids in all the stages. In normal pigmented hoppers and locusts, tyrosine, phenylalanine and tryptophan are present in larger concentration than in albino insects.