Sources said that the trio was planning to smuggle it to Malaysia via Delhi. The accused were identified as Baluchamy, 52, Akbar Ali, 45, and Jaffer Ahmed, 35, all hailing from Trichy.
Cops also found plane tickets for Malaysia from the trio, which indicated that the trio was planning to smuggle it to Malaysia via Delhi.
Meanwhile, the three were handed over to the customs department for further investigation, by the DRI officials.
The ephedrine is used to manufacture party drugs known as ice and speed. Earlier, in 2011, 106 kg of ephedrine was seized at the Chennai airport.