Résumé
Penicillin is a kind of β-lactam drug which has been applied in the clinical treatment firstly in the world, and it has still been widely used at present. The synthesis and regulation mechanism of Penicillium chrysogenum, which is used to produce penicillin, has been studied quite maturely, but its proteomics research started relatively late and fewer reports were published. This paper reviews the synthesis and application of penicillin, transformation of Penicillium chrysogenum, and the research progress of its proteomics. On this basis, the study highlights the advantages of proteomics in the research of protein expression.
Sujets)
Pénicillines , Penicillium chrysogenum , Métabolisme , Protéome , ProtéomiqueRésumé
Objective Oligosaccharides of Rehmannia glutinosa were separated and purified by different molecular weight cut-off ultrafiltration(UF) membranes,and then ultrafiltrate was concentrated and purified by nanofiltration(NF) membrane.Methods Different molecular weight cut-off UF unit first and then NF unit were used in process.Results Oligosaccharides were separated by twice UF,the optimum separation conditions:the concentration of feed solution was 13—132 mg/mL,the operation pressure was 0.25—0.275 MPa,and the temperature was 20—40 ℃.Then ultrafiltrate was concentrated and purified by NF membrane,the optimum separation conditions:the operation pressure was 0.59—0.79 MPa,the temperature was 20—40 ℃,and the concentration multiplegot to three.Under this condition,the total extraction rate of oligosaccharide products was 46.63% and the purity was above 93.3%,the molecular weights of oligosaccharide products determined by gel filtration were less than 6 000.Conclusion The technology is not only simple and feasible but also easy to separate and purify the oligosaccharides of R.glutinosa effectively.
Résumé
ZHANG Lin-hua, GAO Rui-chang, XU Ming-li (School of Chemical Engineering, Tianjin University, Tianjin 300072, China)