西亚试剂：：Plasmid Quickpreps

发布时间：2025-10-01

 

1. grow up single colony in 1.5 ml LB/antibiotic ovn @37°C
2. pour into tube, spin for 30 sec
3. decant supernatant and resuspend pellet in 100 ml lysis solution
4. add 200 ml alkaline SDS, vortex well
5. incubate for 5 min on ice
6. add 150 ml high salt solution, vortex well
7. incubate for ca. 10 min on ice
8. spin for 10 min
9. remove 400 ml supernatant and transfer to new tube prefilled with 400 ml isopropanole
10. vortex well and keep tube on ice for 10 min
11. spin for 10 min
12. wash pellet with 70% EtOH
13. vacuum dry pellet for 5 min and take up in 100 ml 1x TE/20 mg/ml RNAse A
14. usually 1-2 ml is enough for digest (high-copy plasmid), keep DNA frozen at -20°C
15. phenolize important preps if to be kept for a longer period of time (more than 4-6 months)

 

 

Solutions:
lysis solution: (freshly prepared)  7.55 ml H2O  2    ml 50% glucose  0.2  ml 0.5 M EDTA  0.25 ml 1 M Tris-HCl pH 8 ------ 10    ml total		alkaline SDS: (stable for 1 week)  7.6  ml H2O  2    ml 5% SDS  0.4  ml 5 N NaOH ------ 10    ml total
hight salt solution: 3 M NaOAc pH 5.2 (same solution as used in precipitating DNA)

 

Remarks:

Even if kept at -20° C DNA from this quality will degrade over a period of a year or so when not phenolized carefully (ca. 3 x)! Take care that no interphase remains.

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