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Quantum Sufficiat/Suffic

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#1 LabLackey



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Posted 06 February 2014 - 11:49 AM

Hello, everyone.


A friend and I were discussing the term 'quantum sufficit' or (incorrectly) 'quantum sufficient'.  We understand it to mean adding water to a concentrated stock solution in order to make sufficient working stock; e.g. when making 1.0 L of LB media, you do not add the necessary reagents to 1.0 L of water and mix, you would add it to, say, 750mL of water, mix and pH the solution, then add enough water to get up to 1.0 L.


Does anybody else use the term 'QS'?  I mentioned it today to some coworkers and nobody knew what it meant.


Thanks for your opinions!


[Edited for clarity.]

Edited by LabLackey, 06 February 2014 - 11:50 AM.

#2 bob1


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Posted 06 February 2014 - 12:04 PM

I use it as an abbreviation in my lab book - I use it as you do - "make up to final volume"  and have never considered that it might have any other meaning.

#3 Ameya P

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Posted 07 February 2014 - 12:26 AM

I have seen it on medicines actually.  Didn't quite know what it meant, until today.


Thanks, LabLackey! 

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#4 Bio-Lad



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Posted 22 June 2014 - 04:42 AM

I use QS when I'm writing protocols. I picked it up at a pharmaceutical company I used to work at, although I seem to recall my old grad school PI using it, too.

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#5 mdfenko


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Posted 23 June 2014 - 05:53 AM

i've seen it used in papers and instructions.

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