Jump to content

  • Log in with Facebook Log in with Twitter Log in with Windows Live Log In with Google      Sign In   
  • Create Account

Submit your paper to J Biol Methods today!
Photo
- - - - -

Quality of aliquot for SDS-page in protein purification


  • Please log in to reply
1 reply to this topic

#1 PhD

PhD

    Enthusiast

  • Active Members
  • PipPipPipPipPip
  • 39 posts
1
Neutral

Posted 28 August 2009 - 04:40 AM

Hello there,

I wanted to know what the standard was in considering something a protein sample as pure. Everyone tells you to take an aliquote of ur fractions and load them on a gel to check for purity. The thing is I used to elute my protein in 1ml fractions and loaded 10ul on a gel. Saw no contaminants after tweeking the protocol, was very happy. Then I decided to elute in 500ul fractions and load as much as I could on the gel. So I ended up without actually wanting to loading 40-50ug of my protein on gel. Surprise surprise I see several bands in the background. So what should I gain from this observation? Am I just being too anal about this? Could someone maybe tell me what the standard is for purity because I really dont get it anymore but I want to be sure that my work is good.

Im sorry if this is a stupid post but I dont like the idea of not knowing and I hope you are all looking forward to the weekend like I am :)

Thank you in advance!

#2 mdfenko

mdfenko

    an elder

  • Active Members
  • PipPipPipPipPipPipPipPipPipPip
  • 2,811 posts
136
Excellent

Posted 29 August 2009 - 08:48 PM

98-99% purity is pretty good. eventually you will reach the point of diminishing returns, where the cost in yield is too high to justify a small gain in purity.

the protein needs to be pure enough that the contaminants won't significantly affect your results.
talent does what it can
genius does what it must
i do what i get paid to do




Home - About - Terms of Service - Privacy - Contact Us

©1999-2013 Protocol Online, All rights reserved.