 In 1814 he relocated to Constantinople on behalf of family business, and in 1820 gained the post of deputy of commerce in Constantinople.In 1833 he returned to France, eventually settling in the city of Miramas, where in 1846 he was named mayor.The brown algae genus "Castagnea" (Derbès and Solier, 1856) commemorates his name, as does the red algae species "Polysiphonia castagnei" (Kützing, 1863).