Steam distillation (standard), SFE-CO2 with ultrasonic+freeze-drying (CN201110304608, perillaldehyde recovery up to 92%), and low-temperature + molecular distillation (monoterpene retention 89.3%).
Perilla frutescens (L.) Britt. var. purpurascens (purple-red Zi Su), Lamiaceae, fresh leaves & aerial parts; PA chemotype; Dao-di regions Heilongjiang Suihua, Inner Mongolia Chifeng, Gansu Dingxi; also Japan & Korea.