Re: [DIYbio] Re: Do-it-yourself NMR spectroscopy

spencer whyte <spencerwhyte@gmail.com> writes:

> Hey, another student here. I have been working on my own DIY NMR on a
> budget for a little while now.
>
> Nathan is right, when operating at low fields it is a constant fight
> against noise.
>
> The best article I have seen so far is this one:
>
> http://iopscience.iop.org/0957-0233/21/10/105902
>
> It is an absolute must read if you are interested in constructing your own
> NMR on a budget.
>
> All the best,
>
> Spencer Whyte
>
>
Hi,

You will need to take care of what you are looking for. Which kind of
samples do you want to analyze ?

The chemical shift dispersion is dependant of the field. So on
ultra-low-fields, you will not be able to distinguish different
compounds (at least not all their signals) and you will be overflooded
by higher-order effects and the influence of coupling constants (which
are everything but negligible at these fields).

I'm pretty impressed by the S/N quality of their spectrums, well ok they
used 0.5L of sample ;) but still, with such cheap amplifiers that's a
good result.

Their technology is pretty nice and can be improved a lot. Especially
decoupling the computer from the acquisition, you can use better cards
than arduinos and connect sdcards for storing acquisitions. Then you can
run your system completely in a faraday cage, avoid those main (50 or 60
Hz and their artifacts) and CFLs (ahh those crappy little emitting
things…)

If you need to develop a complete system you have these :
http://store.gadgetfactory.net/papilio-one-250k/
(This one is just an example, there is a lot of FPGA cards out there)
They will need a lot of development, but having an autonomous system is
priceless in these conditions and you will not be limited anymore by
limitations of an arduino.

Hmmm now I want to build one :p

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