... [4].For accurate diagnosis of a cause of death in an opiate poisoning case, the ratio of a free form to a conjugated form becomes important (see section 4 of this chapter). In such a case, an opiate ... Hasegawa M, Maseda C, Kagawa M et al. (1992) Morphine and codeine being contained in poppy seeds and poppy seed-containing foods. Eisei Kagaku 38:192–195 (in Japanese with an English abstract) ... methodsQualitative analysis is performed by nding a peak appearing at the same retention time as that of the authentic standard a er trimethylsilyl (TMS) derivatization; it is also impor-tant...