Volatile oxylipins and related compounds formed under stress in plants. 
Plants form volatile oxylipins and related compounds under stress.  Some of them are important flavor chemicals and give big impact on the flavor quality of food made from plant materials.  They are also involved in defense responses of plants against pathogens and herbivores.  Furthermore, in some instances, they cause harmful effects on plants themselves.  Because of these significances of volatile oxylipins and related compounds, demands to perform comprehensive analyses of these compounds are increasing.  In this chapter, we describe the simple but efficient procedures to reveal profiles of volatile oxylipins and related compounds by using HPLC and GC-MS.  They are simple and can be performed in biochemical laboratories equipped with common facilities.