Production methods of malic acid

At present, the production method of l-malic acid has been developed from the early single extraction method to the following methods: Extraction method, chemical synthesis method, one-step fermentation method, two-step fermentation method, immobilized enzyme or cell transformation method [2]. At present, the existing problems are still the lack of excellent production strains, in the study of breeding excellent strains at the same time, pay attention to strengthen the extraction process and other related technology research, to do a good job in the upstream and downstream engineering supporting technology research and development is very necessary