China's Ministry of Commerce (MOC) announced Tuesday that it is to impose five-year anti-dumping measures on food additives imported from Indonesia and Thailand.

Investigations had found companies in Indonesia and Thailand had been dumping food additives in the Chinese market, causing substantial damage to Chinese manufacturers, said a statement on the website of the MOC.

The final ruling required importers of disodium 5'-inosinate, disodium 5'-guanylate and disodium 5'-ribonucleotide to pay anti-dumping tariffs from Sept. 24, the MOC said.

The statement also listed new tariff rates for products imported from the two Indonesian companies, PT. Cheil Jedang Indonesia and PT. Kirin Miwon Foods, at 6.3 percent and 6.9 percent, respectively, and a 4.8-percent rate for the Ajinomoto Co., (Thailand) Ltd. of Thailand.

For all the other food additives producers in the two countries, a 29.7 percent anti-dumping rate would be imposed, according to the statement.

China launched an anti-dumping probe into imported food additives from Indonesia and Thailand in March last year. The MOC implemented temporary anti-dumping measures on Jan. 4.

The additives are mainly used in monosodium glutamate, soy sauce and other condiments to enhance flavor.