Difference between revisions of "Project:Plant species testing"
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* Incubate for 15 mins at 60°C (optional step that we didn't take) | * Incubate for 15 mins at 60°C (optional step that we didn't take) | ||
* Centrifuge - recover supernatant | * Centrifuge - recover supernatant | ||
− | * Add proteinease K (100 ul of 1mg / ml to 300 ul pea template) - incubate for 1 hr at 50C (action of proteinase k) then 94 C for 10 mins (inactivation of proteinase K) | + | * Add proteinease K (100 ul of 1mg / ml solution to 300 ul pea template) - incubate for 1 hr at 50C (action of proteinase k) then 94 C for 10 mins (inactivation of proteinase K) |
* Precipitation to follow | * Precipitation to follow | ||
Revision as of 08:21, 18 July 2012
We are using primers for plants to test and refine our DNA extraction / PCR technique. First project is to test for peas. Inspiration and primers are in this paper.
First extraction and PCR - 17/7/12
We used two methods of extraction. Method 1:
- Blend peas with salt and detergent according to this protocol. Sieve.
- Incubate for 15 mins at 60°C (optional step that we didn't take)
- Centrifuge - recover supernatant
- Add proteinease K (100 ul of 1mg / ml solution to 300 ul pea template) - incubate for 1 hr at 50C (action of proteinase k) then 94 C for 10 mins (inactivation of proteinase K)
- Precipitation to follow
Method 2 (From this paper - we also have full text available):
- 'Homogenize' (mush) approx 40 mg pea with a pestle in 300ug of 5% chelex solution for 1 min
- Vortex for 10s then boil for 5 mins, then vortex again for 10s. (Hot plate lost heat in the middle so we boiled for 8 mins)
- Centrifuge for 1 min - recover supernatant and use as template
PCR:
- Prepare sample with 12.5 ul of Taq ready mix, 2 ul of each primer, 3 ul of template, and 5.5 ul of distilled water.
- Denature at 96°C for 5 mins
- 40 cycles of D = 96°C for one minute, A = 58°C for 30 seconds, E = 72°C for one minute.
- Put paraffin on top after 5 mins (should have been before start)