Heinz said in a statement that independent results from six authorized testing agencies all failed to find traces of GM ingredients in rice used for its baby cereal products.
Earlier this month Greenpeace claimed that a batch of infant rice cereal contained GM ingredients. Heinz said at the time it had already sent test results to the authorities and informed Greenpeace of the findings.
However Greenpeace claimed that tests it commissioned from the laboratory GeneScan on baby foods in Beijing had shown up GM ingredients in a product made by the Heinz-UFE joint venture in Guangzhou.
The latest tests for Heinz were done by the SGS Group and Hong Kong-based DNA Chips as well as an agency under the Ministry of Agriculture and three provincial-level authorities.
"We strongly refute any suggestion of possible irregularities with tests conducted on Heinz baby cereal on our behalf," said Heinz in the statement.
China has not approved sales of any kind of genetically modified rice.
