BEIJING - Some food safety experts have expressed doubts about the use of additives in rice, although officials said they are free from potential safety hazards.

In response to media reports questioning the revised National Standard for Food Additives, the Ministry of Health issued a statement on Saturday, saying two additives - sodium diacetate and chitosan - were permissible for rice, and that a thickening agent - sodium starch phosphate - can be used in some rice products, such as rice noodles.

In the statement, Wang Zhutian, deputy director of the Fortified Food Office (FFO) under the Chinese Center for Disease Control and Prevention, said sodium diacetate is a widely used preservative in grain, rice and pastry, and chitosan is a coating agent used in rice. Both can help retain freshness and prevent mildew.