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Team:Cambridge/Protocols/beta-galactosidaseassay
From 2012.igem.org
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| + | *Tubes with most β-galactosidase activity will be most blue. This can be quantified using a spectrophotometer at wavelength 420 nm. | ||
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Revision as of 17:42, 15 August 2012
β-galactosidase Assay
Theory
Protocol
- Take suspension of cells grown up overnight and dilute 200 times in appropriate growth medium (for example LB broth for e.coli). If genetic construct can be selected for by an antibiotic, include this in the growth medium according to needs - this prevents loss of the plasmid during growth.
- Now add the following to each of your eppindorf tubes:
| Reagent | Volume (µl) |
| X-Gal (10mg/ml) | 20 |
| Substance of interest (e.g. Fluoride) (0.5 M) | 1 for each mM desired in final solution |
| Cell suspension | Make up to 500 μl |
- Leave tubes overnight in 37 °C incubator.
- Tubes with most β-galactosidase activity will be most blue. This can be quantified using a spectrophotometer at wavelength 420 nm.
