Phospholipid fatty acids from exocrine and reproductive tissues of male american cockroaches, Periplaneta americana (L.)

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Abstract
We present the phospholipid fatty acid compositions, determined by GLC,* of four individual tissues (testes, mushroom glands, conglobate glands, and salivary glands) from adult male cockroaches, P. americana. The testes phospholipids contained higher proportions of palmitic acid than did the exocrine tissues (16% vs about 8%). This was also true for palmitoleic (2.3% vs 0.4–1.3%), oleic (49% vs 30–35%), and linolenic acids (7% vs 0.5–2.8%). Testicular extracts were lower in linoleic acid (16%) than were the exocrine gland extracts (at 40–45%). All four tissues also contained low proportions of several long‐chain polyunsaturated fatty acids of both omega‐3 and omega‐6 metabolic families, including C20:3n6, C20:4n6, and C20:5n3. The data suggest that the phospholipid fatty acid profiles of specific tissues differ from each other and from those obtained from whole‐insect extracts. The presence of several polyenoics from the n3 and n6 metabolic families is interpreted in the context of complex fatty acid requirements at the tissue level.