By intercepting the most effective fragment of human collagen’s gene,recombinant human-like collagen is produced by genetic engineering technology and biotechnology.The collagen has good biocompatibility and can prom...By intercepting the most effective fragment of human collagen’s gene,recombinant human-like collagen is produced by genetic engineering technology and biotechnology.The collagen has good biocompatibility and can promote cell formation.Recombinant human-like collagen has great potential application value in medical biological materials,cosmetics and foods.In recent years,many specialized enterprises which are engaged in human-like collagen raw materials production have emerged.In this paper,a brief summary of the current recombinant human-like collagen raw material’s production and its latest research and development have been made.展开更多
Recombinant Escherichia coli BL21 is used to produce human-like collagen. The key constituents of media are optimized using response surface methodology (RSM). Before thermal induction, the highest biomass production ...Recombinant Escherichia coli BL21 is used to produce human-like collagen. The key constituents of media are optimized using response surface methodology (RSM). Before thermal induction, the highest biomass production and the lowest production of some hazardous by-products, especially acetic acid, were obtained in the media containing 0.085 mol·L-1 glucose and 0.019 mol·L-1 nitrogen (carbon-nitrogen ratio, 4.47:1). After thermal induction, when the concentrations of glucose and nitrogen in the media were 0.065 mol·L-1 and 0.017 mol·L-1 , respectively (carbon-nitrogen ratio, 3.82:1), the productivity of human-like collagen per cell was the highest while that of acetic acid was the lowest. The extended analysis showed that the production of lactic acid and propionic acid increased while that of some intermediate acids of the tricarboxylic acid cycle decreased if the dose of glucose increased.展开更多
Recombinant E. coli BL 21 was cultivated in high cell density to produce human-like collagen. The effects of the feeding of nitrogen source, controlled by an auto on/off-feeding mode with two different cycles of 0.5mi...Recombinant E. coli BL 21 was cultivated in high cell density to produce human-like collagen. The effects of the feeding of nitrogen source, controlled by an auto on/off-feeding mode with two different cycles of 0.5min and 4min intervals, oxygen-enrichment methods and inducement strength on the cell yield and human-like collagen production were investigated. The studies showed that nitrogen source feeding in fast cycle could result in higher human-like collagen production than that in slow cycle; and the feedback regulation of glucose, increase of the pressure of fermentation bioreactor, and supply of oxygen-enriched air could all increase cell yield and human-like collagen production. The effects of inducement strength on protein expression were found important. When OD600 reached 90-100, the cultivation temperature was increased to 42℃ to begin induction for 2-3 h, and then shifted to 39℃ for 5-6h induction, the cell density and human-like collagen production could reach 96g·L-1 [DCW (dry cell mass)] and 19.8% (g·g-1 DCW) respectively.展开更多
文摘By intercepting the most effective fragment of human collagen’s gene,recombinant human-like collagen is produced by genetic engineering technology and biotechnology.The collagen has good biocompatibility and can promote cell formation.Recombinant human-like collagen has great potential application value in medical biological materials,cosmetics and foods.In recent years,many specialized enterprises which are engaged in human-like collagen raw materials production have emerged.In this paper,a brief summary of the current recombinant human-like collagen raw material’s production and its latest research and development have been made.
基金Supported by the National High Technology Research and Development Program of China （2006AA02Z246 2007AA03Z456） the National Natural Science Foundation of China （20776119 21076169）+4 种基金 Xi’an Research and Development Program（CX0735） the Scientific Research Program of Shaanxi Provincial Department of Education China （07JK417 07JC16 JG08181） the Natural Science Foundation of Shaanxi Province （2010JQ2012） the Specialized Research Fund for the Doctoral Program of Higher Education of China （20096101120023 20096101110014） Shaanxi Key Subject Program China
文摘Recombinant Escherichia coli BL21 is used to produce human-like collagen. The key constituents of media are optimized using response surface methodology (RSM). Before thermal induction, the highest biomass production and the lowest production of some hazardous by-products, especially acetic acid, were obtained in the media containing 0.085 mol·L-1 glucose and 0.019 mol·L-1 nitrogen (carbon-nitrogen ratio, 4.47:1). After thermal induction, when the concentrations of glucose and nitrogen in the media were 0.065 mol·L-1 and 0.017 mol·L-1 , respectively (carbon-nitrogen ratio, 3.82:1), the productivity of human-like collagen per cell was the highest while that of acetic acid was the lowest. The extended analysis showed that the production of lactic acid and propionic acid increased while that of some intermediate acids of the tricarboxylic acid cycle decreased if the dose of glucose increased.
基金Supported by the National Science and Technology Key Funds (2003DA901A32)the National Nature Science Foundation (No. 20476085).
文摘Recombinant E. coli BL 21 was cultivated in high cell density to produce human-like collagen. The effects of the feeding of nitrogen source, controlled by an auto on/off-feeding mode with two different cycles of 0.5min and 4min intervals, oxygen-enrichment methods and inducement strength on the cell yield and human-like collagen production were investigated. The studies showed that nitrogen source feeding in fast cycle could result in higher human-like collagen production than that in slow cycle; and the feedback regulation of glucose, increase of the pressure of fermentation bioreactor, and supply of oxygen-enriched air could all increase cell yield and human-like collagen production. The effects of inducement strength on protein expression were found important. When OD600 reached 90-100, the cultivation temperature was increased to 42℃ to begin induction for 2-3 h, and then shifted to 39℃ for 5-6h induction, the cell density and human-like collagen production could reach 96g·L-1 [DCW (dry cell mass)] and 19.8% (g·g-1 DCW) respectively.
