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对室温储存２０年的以苯胺法与酸法不同工艺生产的各类棉酚样品，进行了反相高效液相色谱分析，测定了样品中棉酚的含量，并证实苯胺法生产的棉酚中含有微量的单苯胺棉酚杂质。
The reversed-phase high-performance liquid chromatography (HPLC) analysis was performed on various types of gossypol samples produced by different processes of aniline and acid for 20 years at room temperature. The content of gossypol in the samples was determined, and the gossypol produced by the aniline method was confirmed. Contains trace amounts of monoaniline gossypol impurity.