title: A micro method of estimation of retinal & 3-dehydroretinal with 2,4-dinitrophenylhydrazine.
mesh_terms: D002338:Carotenoids / Q000032:analysis*; D003124:Colorimetry; D004140:Dinitrophenols; D006834:Hydrazines; D008722:Methods; D008832:Microchemistry; D014801:Vitamin A / Q000032:analysis*
chemical_list: D004140:Dinitrophenols; D006834:Hydrazines; D014801:Vitamin A; D002338:Carotenoids