The C18 juvenile hormone of insects can be dissolved in aqueous solutions up to a concentration of 2.5 - 3.0 × 10-5 M; changes in pH, buffer composition and ionic strength hardly affect this solubility. The hormone is salted out gradually by increasing ammonium sulphate concentrations. The juvenile hormone is bound to proteins such as bovine serum albumin or goat immunoglobulin G and can be kept in solution by these proteins up to 10-3 M. The hormone is strongly absorbed by many commonly used plastic materials but only to a lesser extent by glass and teflon.
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Giese et al. (1977) studied this question.
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