Abstract
Age determination of insects collected from vertebrate remains is an essential step in estimating time since colonization as related to the post-mortem interval. Long-established methods for making such estimates rely on determining age related to stage of development at the time of collection in relation to conditions experienced. However, such estimates are based on the completion of a stage of development. Methods allowing for more precise estimates of age (i.e., within a stage of development) are sorely needed. This study examined the potential of volatile organic compounds emitted by blow fly, Ch. rufifacies (Macquart), immatures to determine stage of development, which could potentially be used to estimate the age. Volatile organic compounds (VOCs) from the larval and pupal stages of Ch. rufifacies were collected by headspace solid-phase micro-extraction followed by gas chromatography-mass spectrometry (GC-MS). Analyses indicated 37 compounds shift quantitatively, as well as qualitatively, as the larvae and pupae age. Furthermore, compounds, such as 2-ethyl-1-hexanol, phenol, butanoic acid, hexadecanoic acid, octadecanoic acid, 2-methyl propanamide, and 2-methyl butanoic acid, serve as indicator compounds of specific stages within Ch. rufifacies development. This information could be important to determine if these compounds can be used in the field to predict the presence of certain developmental stages, in order to determine the potential of using volatile markers to estimate time of colonization.
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Acknowledgments
Authors are grateful to United States-India Educational Foundation to provide funding support to complete this study. Authors are also thankful to Dr. Travis Rusch from FLIES Facility, Texas A&M, for providing C. rufifacies adults to start a colony and members of the F.L.I.E.S Facility for the assistance during experimental work. Authors extend thanks to the Geochemical and Environmental Research Group (GERG), Texas A&M, for providing GC-MS facility. We thank Dr. Vivek Polshettiwar an associate professor from Tata Institute of Fundamental research, Mumbai, India, for providing access to his laboratory to use Chemstation software to complete the GC-MS analysis.
Funding
This study was funded by Institute of International Education, New York, USA (Grant number: 2221/DR/2017-2018).
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Sharma, A., Tomberlin, J.K., Delclos, P. et al. Volatile compounds reveal age: a study of volatile organic compounds released by Chrysomya rufifacies immatures. Int J Legal Med 135, 967–977 (2021). https://doi.org/10.1007/s00414-020-02471-1
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DOI: https://doi.org/10.1007/s00414-020-02471-1