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Chelex 100

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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Chelex 100

Postby CZU » Tue Sep 20, 2005 12:25 pm

Hi
I want to use Chelex 100 resin to extact DNA but in catalogue i found two kind of this reagent (with dry mesh size 100-200 and 200-400). Do you know practical differences between these reagents?
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Postby sachin chandraker » Tue Aug 22, 2006 8:30 am

Chelex is great for DNA extraction for difficult samples often seen in forensic type work and inexpensive. This is from a Biorad leaflet..
Chelex 100 molecular biology grade resin is a highly pure, pipettable, nuclease and ligase inhibitor-free chelating resin specifically designed and certified for extraction of PCR-ready template DNA. Chelex 100 molecular biology grade resin accommodates the stringency required for a PCR-quality product by ensuring the complete removal of PCR inhibitors (contaminating metal ions that catalyze the digestion of DNA)...

Its a size thing as the resin has many applications and most people use the larger 200-400 mesh for DNA work. I am sure someone out there has got the real reasons but in practical terms go for the larger one.

sachin chandraker
source: BW Parky
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chelex 100

Postby ceydakansu » Fri Nov 17, 2006 9:59 am

Hi,
I have ordered chelex 100 for dna isolation, but could not succeeded. It is probably my samples were gr+ bacteria. Has anyone have experience working with chelex for isolation of dna?
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Re: Chelex 100

Postby ulson » Thu Oct 27, 2011 7:37 am

Hi,
I have a problem with chelex too. The difficulty lies in the lack of dissolve. I've been trying everything: boiling water, tris + 4NaOH (pH 11 and even more in the end), tris with acetic acid... and nothing. All this method i found in protocols located in Internet. unfortunatelly all publications i've found, wich include chelex extraction, didn't mention about dissolving it.
I am possessing chelex 100 in a form of tiny wihite crystals. if anybody know about solution of my problem, please, help.

Ps. sorry for my english :)
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Postby workforfood » Thu Nov 03, 2011 5:17 pm

The chelex 100 solution is not going to dissolve in its de-ionized water. I have used chelex for quite some time, and I have found that the best extraction results are as follows:
1)spin down a sample to a pellet in a 1.5ml microcentrifuge tube.
2)Decant supernatant
3)Add 100 micro liters of 5% chelex 100 (shake first to get the solution to mix, and pipette quickly into your sample before the chelex settles to the bottom.)
4)boil in water for 10 minutes
5)spin down at13,000rpm for 2 minutes (must be this fast or the DNA final content will be much less.)
6)pipette off the supernatant (The DNA is in the supernatant) and pipette into a new 1.5 ml micro tube. If the supernatant is cloudy, or concentration readings are not accurate, leave the sample in 4degree overnight, and spin down again at 13,000rpm and take the supernatant off again to a new tube.

-Hope this helps
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Re: Chelex 100

Postby ulson » Fri Nov 04, 2011 8:37 am

thanks workforfood :wink: i'll try it today.
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Postby vksvikaas » Thu Feb 16, 2012 2:06 pm

plz can anyone tell me the pecentage of ds or ss DNA that is obtained after isolatin DNA from chelex 100 resin. I have heard that chelex-100 resin gives ss dna. can anyone help.
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