The Main research in this paper is the process of producing L (+)-lactic acid from potato starch by direct fermentation with composite Rhizopus oryzae. The research work include: the study on producing L (+)-lactic acid by Rhizopus oryzae AS3.819、Rhizopus oryzae AS3.851 and the study of joint Mutation Breeding; The applied research of development from single Rhizopus oryzae to multi- Rhizopus oryzae; the study of controlling of fermentation process, adjustment of metabolization; and the process of extraction, separation, purification and refinement of L (+)-lactic acid.
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