Analysis of cockroach oothecae and exuviae by solid-state 13C-NMR spectroscopy |
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| Institution: | 1. U.S. Grain Marketing Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, KS 66502, U.S.A.;2. Department of Chemistry, Washington University, St Louis, MO 63130, U.S.A.;3. Department of Entomology, Kansas State University, Manhattan, KS 66506, U.S.A.;1. Department of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, PR China;2. State Key Lab of Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China;3. School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, PR China;1. Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China;2. Department of Chemistry and the Tsinghua Center for Frontier Polymer Research, Tsinghua University, Beijing 100084, China;3. Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Nanchang 330006, China;1. Department of Chemistry, Drexel University, Philadelphia, PA 19104, United States;2. Electrical and Computer Engineering, Drexel University, Philadelphia, PA 19104, United States;3. Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, United States |
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| Abstract: | Sclerotized oothecae from four species of cockroaches, Periplaneta americana, P. fuliginosa, Blatta orientalis and Blattella germanica, were examined by solid-state 13C-nuclear magnetic resonance and chemical analyses. The oothecae were composed of protein, water, calcium oxalate, diphenolic compounds, lipid, and uric acid. Calcium oxalate was the major soluble component in egg cases of P. americana, P. fuliginosa, and B. orientalis. Oothecae of B. germanica had approx. 10-fold less calcium oxalate and extractable diphenols than the other species. The major diphenolic compound extracted in cold dilute perchloric acid was 3,4-dihydroxybenzoic acid. Exuviae from P. americana, B. germanica, Gromphadorhina portentosa, Blaberus craniifer, and Leucophaea maderae also were examined by solid-state 13C-NMR. They contained protein, diphenols, and lipid, as well as chitin, which accounted for 30–42% of the organic content, depending upon the species. |
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