A Novel Process For Synthesis Of L-Glutamic Acid

L-glutamic acid is a kind of important chemical compound, which is mainly produced by ferment method from maize, wheat, sweet potato, rice, sugar molasses, beet molasses. The selection of raw material is usually dependent on the resource conditions and economic returns. Provinces in south China mainly use rice to produce glutamic acid. Unfortunately the price of rice is on the rise, the production cost of glutamic acid also increase.What makes it urgent in Hunan province is to improve technology, reduce the production cost and improve productivity. Based on the practical condition and with the project of Hunan Education Department[05D032], this research employ mellow rice as material to produce glutamic acid, which explores a new way of using rice comprehensively.Author explored the new technology of using mellow rice to produce glumatic acid by employing double enzyme saccharified liquid to ferment. The research results in this paper are as the following:Firstly, it researches on the technology of using rice as material to produce sugar by hydrolysis and then get glutamic acid by microorganism ferment.Its economic technical data are as the following: saccharification rate 95-98%, ferment rate 55%~56%, acid rate 9.7%-10.3%. These conditions can fully satisfy the need of glutamic acid ferment. At the same time it can make comprehensive use of rice protein from sugar making and produce rice protein powder, which will reduce the cost of production.Secondly, author built up the optimized process to synthesize glutamic acid from mellow rice by double enzyme saccharification, and produced the index thus liquefaction and saccharification can be controlled. The higher and lower sugar concentration liquid can be directly saccharificd in the ferment. The technological indexes in this research are respectively liquefaction pH 5.8-6.0,α-lamylase 10～12U/g dry material , 106～109℃last for 5～8min ,flash-cool to 95～97℃, keep for 90～120 min, saccharification pH4.2～4.4, saccharification enzyme 100～120U/g (dry material) , temperature 60±2℃, time 28～32 h。Thirdly, the complex use of fermented waste liquid in the producing process was studied. The research adopted upper clean liquid the ferment to produce bacterial cellulose, and its ferment technological indexes are respectively saccharified liquid...