激素根据其物理化学性质可分为两大类。蛋白质和多肽类激素可无限制地溶于水,而疏水性(小分子)的“靶腺”激素与此不同,在溶液中与白蛋白和特殊的转运蛋白相结合而存在。性激素结合球蛋白、皮质类固醇结合球蛋白(CBG)和甲状腺素结合 Hormones can be divided into two major groups based on their physical and chemical properties. Protein and peptide hormones can be dissolved in water without restriction, and hydrophobic (small molecule) “target gland” hormones are different from this and exist in solution in combination with albumin and specific transport proteins. Sex hormone binding globulin, corticosteroid binding globulin (CBG) and thyroxine binding