Melamine in pesticides, human food chain - experts HONG KONG, Sept 23 (Reuters) - Melamine, a chemical that has tainted milk formula and made thousands of Chinese children ill, is used as an agricultural pesticide in China and may have been part of our food chain for a long time, experts said on Tuesday. Chan King-ming, associate professor of biochemistry at the Chinese University, said cyromazine, a derivative of melamine, was very commonly used in China as a pesticide. "It is absorbed into plants as melamine ... of course it is already in our food chain and animal feed," Chan...