Molecular composition of the louse sheath

Craig N. Burkhart, B. Artur Stankiewicz, Irene Pchalek, Michael Kruge, Craig G. Burkhart

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Abstract

Flash pyrolysis-gas chromatography/mass spectrometry was used to assess the chemical composition of the head louse's nit sheath. The pyrolyzate of the female insect's secretions, which form a cement-like cylinder holding the egg onto the hair, is dominated by amino acid derivatives and fatty acids. No chitin-specific compounds were detected in the sheath. These results, contrary to previous reports, show that the polymeric complex of the sheath is composed of protein-acceous moieties, possibly cross-linked to aliphatic components. This study constitutes the first chemical characterization of the pyrolysis products o insect (louse) glue and unequivocally confirms that louse sheaths are not chitinous, as suggested by earlier histochemical studies. Development of agents that might loosen nits from the hair shaft is dependent on research that addresses the chemical composition of the nit sheath.

Original languageEnglish
Pages (from-to)559-561
Number of pages3
JournalJournal of Parasitology
Volume85
Issue number3
DOIs
StatePublished - 1 Jun 1999

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    Burkhart, C. N., Stankiewicz, B. A., Pchalek, I., Kruge, M., & Burkhart, C. G. (1999). Molecular composition of the louse sheath. Journal of Parasitology, 85(3), 559-561. https://doi.org/10.2307/3285796