Method for preparing rebaudioside D through fermentation catalysis of bacillus subtilis
A technology for Bacillus subtilis and catalytic preparation, applied in the field of microbial fermentation enzyme preparations, can solve the problems of complicated operation, inability to apply industrialized production, and high production cost, achieves high enzyme activity level, is beneficial to industrialized production, and reduces the effects of operation steps
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Embodiment 1
[0020] (1) Seed preparation: Link the synthesized glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene to the PBR322 plasmid vector, and the PBR322 plasmid vector carrying the glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene Introduced into the competent state of Bacillus subtilis, the Bacillus subtilis implanted with the glycosyltransferase UGT76G1 gene and the glycosyltransferase AtSUSY gene was inserted into the LB medium, and the temperature of the LB medium was controlled at 35 ° C, and the rotation speed was 200 rpm. Culture time 20 h;
[0021] (2) Seed tank cultivation: The Bacillus subtilis obtained in step (1) was inserted into the seed tank containing LB medium according to the inoculation amount of 5% volume ratio, and the rotation speed of the seed tank was controlled at 300 rpm, and the ventilation ratio ( The aeration ratio is the volume ratio of air passing through a unit volume of culture solution per minute) is 0.5 V / V.min, ...
Embodiment 2
[0027] (1) Seed preparation: Link the synthesized glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene to the PBR322 plasmid vector, and the PBR322 plasmid vector carrying the glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene Introduced into the competent state of Bacillus subtilis, the Bacillus subtilis implanted with the glycosyltransferase UGT76G1 gene and the glycosyltransferase AtSUSY gene was inserted into the LB medium, and the temperature of the LB medium was controlled at 30°C, and the rotation speed was 220 rpm. Culture time 24 h;
[0028] (2) Seed tank cultivation: The Bacillus subtilis obtained in step (1) was inserted into the seed tank containing LB medium according to the inoculation amount of 8% volume ratio, and the rotation speed of the seed tank was controlled at 400 rpm, and the ventilation ratio ( The aeration ratio is the volume ratio of air passing through a unit volume of culture solution per minute) is 1 V / V.min, cult...
Embodiment 3
[0034] (1) Seed preparation: Link the synthesized glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene to the PBR322 plasmid vector, and the PBR322 plasmid vector carrying the glycosyltransferase UGT76G1 gene and glycosyltransferase AtSUSY gene Introduced into the competent state of Bacillus subtilis, the Bacillus subtilis implanted with the glycosyltransferase UGT76G1 gene and the glycosyltransferase AtSUSY gene was inserted into the LB medium, and the temperature of the LB medium was controlled at 30°C, and the rotation speed was 220 rpm. Culture time 24 h;
[0035](2) Seed tank cultivation: The Bacillus subtilis obtained in step (1) was inserted into the seed tank containing LB medium according to the inoculation amount of 8% volume ratio, and the rotation speed of the seed tank was controlled at 400 rpm, and the ventilation ratio ( The aeration ratio is the volume ratio of air passing through a unit volume of culture solution per minute) is 0.3 V / V.min, cul...
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