DNA extraction with phenol chloroform and ethanol precipitation

is it possible to reisolate good quality of DNA from isolated DNA with smearing
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en TP de biologie, on a essayer d'extraire de l'ADN d'oignon. Une chose ne fonctionne pas: le colorant. On utilise du rouge de phénol, ce qui devrait coloriser l'ADN en orange vif, mais rien ne se passe. Est-ce que quelqu'un sait pourquoi?
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i need to know also how to prepare phenol from crystals in an easy method to use it in DNA extraction.
thanks for ur cooperation.
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on peux trouver quelque autre type de purification?
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After completion of the DNA extraction we use the 70% Ethanol for precipitation. why the only 70% and not the 100% use here
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wat u r all thinking abt dna extraction,it is easy to extract,wen u r mind is perfect u can.........
take it easy
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I would like to know how to prepare phenol pH >7.8 that used with chloroform in precipitation of protein in order to purify DNA sample
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Ok protocol is fine but one should also mention the role of each and every chemical or the reagent used!!
that will help in better understanding of the protocol.
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I would like to isolate parsite DNA from stool samples. I would like to know the best protocol to use in this situation. Thanks
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For isolation of bacterial DNA, I recommend streaking out your sample on a plate so as to obtain individual colonies. You can then take a colony and put it in media to make lots of cells. 3mL of LB is a good start. Grow overnight, with shaking. If you don't have access to a Qiagen kit (about $1-2 per sample, smallest pack is 50 reactions) but do have a microcentrifuge and access to chemicals, you can make Qiagen buffers P1, P2, P3 (resuspension buffer with RNase, NaOH for lysis, and potassium acetate for neutralization). Follow the Qiagen protocol until you get to the bind P1+P2+P3 supernatant to column. Intstead, remove it to a new tube and add 2.5 volumes cold 100% ethanol. Spin 14K RPM for 30 minutes, dump off supernatant and you should see a little white DNA pellet. Wash with 70% ethanol, dry until edges are translucent, and resuspend in 50 uL TE buffer.
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I would like to isolate bacterial DNA from wastewater samples. I would like to know the best protocol to use in this situation. Thanks
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you can read molecular cloning by sambrook to clear your concepts about dna extraction and the role of various chemicals in it.
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hello. i an doing dna extraction by phenol chloroform method . after drying the pellet i am keeping it at55c for 1hr. in TE buffer and then at 4c overnight but still pellet remain as such. on pipetting or vortexing the shearing is observed. how can i get an intact dna?
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HELLO.I DO EXTRACTION DNA with phenolchloroform but i have smear can you help me immideatly thank you
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hello excuse me can you help me i do what kind of protocol for DNA extraction of ear gerbilea for good DNA.
THANKS A LOT
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Tengo una dudad si tengo en TE1x mi DNA hice diluciones de 50 microlitros a 25ng/microlitro de DNA si quiero concentrar mas mis muestras o de varias diluciones mis muestras como le puedo hacer para concentrarlas alguien tiene algun protocolo hecho en casa?o me podria explicar como? me urge saber please.
marco45@yahoo.com
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hi, i am an undergraduate student and doing a practical on dna extraction, purification, quantification and restriction enzymes, can you please send me literature review about this practical.
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May I know the procedure given is from which source of reference? Thanks alot.

My next question is .. the DNA for purification is from what kind of extraction method? (Alkaline lysis, boiling, etc) The DNA used in purification is already suspended in buffer solutions or autoclaved water, or right after extraction before suspending in the appropriate solutions?

Thanks. Hope to hear from you.
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Protocol for DNA purification

Purpose for DNA purification:
To precipitate polysaccharides and other contaminating macromoles from the DNA , and improve DNA quality.

Procedure for DNA purification:
1.Add equal volume PCI (phenol/chloroform/isoamyl alcohol, 25:24:1, from Fisher Biotech Cat: BP1752-100) to DNA hydration solution, vortex vigorously, spin 2 mins, a white interface indicates removal of polysaccharides and other contaminating macromolecules. Remove upper aqueous phase to new tube. Note: Phenol and chloroform are biohazards. Dispense in a fume hood and wear gloves.

2.Add 2.5 X volume with 100% ethanol, 10% original volume ammonium acetate (10 M)—can add 1-3 µl glycogen(Invitrogen cat. no.10814-010) here to preserve low amounts of DNA. Glycogen makes a nice visible pellet. Let mixture sit at –20ºC for ~2 hours or preferably overnight at –20ºC.

3.Spin for 20 min at 4 ºC, decant ethanol (rinse pellet with 75% ETOH if it does not move), air dry.

4.Carefully resuspend the pellets in small volumes of hydration buffer and let them dissolve at RT overnight or at 55 ºC for 2 hours.

5.Measure DNA concentration on the UV spectrophotometer. Ideal DNA concentration is 200-500 µg/ml.



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hi, my self rohan i m doin MSc-2 microbiology ,i m doing practical on the DNA extraction but i havent standerd protocol for that, so i require it because it is important for me so plz send it to me
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DNA isolation from Mammalian cells and tissues

In this DNA extraction protocol, we use proteinnase K and phenol, the final DNA molecules are about 100-150 kb after several extraction steps. They are good for PCRs and Southern blotting.

Buffer:
Lysis buffer
10mM Tris-Cl (pH8.0)
0.1M EDTA(pH8.0)
0.5%(w/v)SDS
20 ug/ml DNase-free pancreatic RNase

1.Lysis cells
For adherent cell, trypsinize cell first, wash with PBS.
Add 10ml of lysis buffer for 1ml cell suspension, incubate 1 hour at 37 C.

For lysis of Tissue samples:
use Mortar and pestel, grind prechilled tissue with liquid nitroqen until sample to pulvalize sample.

Add 10 volume powder of lysis buffer in a tube and proteinase K(20mg/ml) to a final lysis buffer, incubate 3 hours at 50C. Swirl tube from time and time.

2.Treatment with phenol
Add equal volume phenol, gently mix 10 minutes and centrifuge 10 minutes at 5000g at RT.Seperate two phases.
3.Use apipette to transfer the supernanant.(aqueous phases)
repeat extraction with phenol.

4.Transfer aqueous phase to a new tube, add 0.2 volume of 10 M ammonium acetate, and add 2.5 volume 100% ethanol at RT. Mix well.See DNA fragments, centrifuge at 5000g. if not see DNA, freeze tube at -20C over night. centifuge later on.
5. wash with 70% ethanol twice
6. Disslove DNA with TE buffer.

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