“…the compound be directly applied to the foodstuff (Snelson, 1987). A variety of methods have been used for methoprene analysis including gas chromatography of acetone extracts of tobacco, soil, meats, water, and forage (Miller et al, 1975; Dunham and Miller, 1978) or of petroleum ether extracts of grain (Mian and Mulla, 1983) or size exclusion high-performance liquid chromatography (HPLC) (Chamberlain, 1985). In the case of grain, hexane extracts have been used (Turnbull and Youssef, personal communication).…”