Wilmington, Del.-based DuPont today announced the expansion of its DuPont Protein Technologies (DPT) business in China, to produce and market soy protein for mainstream consumer foods. The announcement includes a Letter of Intent (LoI) to form a joint venture with the Henan Luohe Shineway Industry Group, and a cooperative agreement with the Zhengzhou government to establish the DuPont Zhengzhou Protein Co. in Zhengzhou, located in Henan Province.