The process of producing citric acid by submerge fermentation serves the early rice in South of China as raw mterial. The strain is Aspergillus niger TD 0168 developed by TRIIM (Tianjin Research Institute of Industrial Microbiology).

• 以稻米为原料生产柠檬酸 ,是以我国南方长期积压的早稻米为原料 ,采用天津工微所选育的黑曲霉菌种 TD- 0 16 8,经过深层发酵工艺而实现的。