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[Question from NMRWiki Q&A forum] High Pressure NMR Samples

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NMR processing:

MDD

NMR assignment:

Backbone:

Side-chains:

NOEs:

Structure from NMR restraints:

Ab initio:

Fragment-based:

Rosetta-NMR (Robetta)

Template-based:

GeNMR

I-TASSER

Refinement:

Amber

Structure from chemical shifts:

Fragment-based:

Homology-based:

Torsion angles from chemical shifts:

Preditor

TALOS

Promega- Proline

Secondary structure from chemical shifts:

CSI (via RCI server)

TALOS

MICS caps, β-turns

d2D

PECAN

Flexibility from chemical shifts:

RCI

Interactions from chemical shifts:

HADDOCK

Chemical shifts re-referencing:

NMR model quality:

NOEs, other restraints:

Chemical shifts:

RDCs:

Pseudocontact shifts:

Protein geomtery:

SAVES2 or SAVES4

Quality Control Check

NMR spectrum prediction:

FANDAS

MestReS

V-NMR

Flexibility from structure:

Backbone S2

Methyl S2

B-factor

Molecular dynamics:

Gromacs

Amber

Antechamber

Chemical shifts prediction:

From structure:

Shiftx2

Sparta+

Camshift

CH3shift- Methyl

ArShift- Aromatic

ShiftS

Proshift

PPM

CheShift-2- Cα

From sequence:

Shifty

Camcoil

Poulsen_rc_CS

Disordered proteins:

MAXOCC

Format conversion & validation:

CCPN

From NMR-STAR 3.1

Validate NMR-STAR 3.1

NMR sample preparation:

Protein disorder:

DisMeta

Protein solubility:

Isotope labeling:

Solid-state NMR:

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02-23-2012, 09:08 PM

nmrlearner

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High Pressure NMR Samples

High Pressure NMR Samples

I need to run NMR on samples of anhydrous ammonia. The boiling point of anhydrous ammonia is -33.34 deg C. In order to be able to have enough time to acquire spectra, I would like to seal the NMR tubes. Once the sample tubes are sealed, the ammonia will build up pressure until it reaches equilibrium and exists as a liquid at room temperature (at approximately 10 atm of pressure). I know NMR tubes exist which can easily withstand these sorts of pressures, but my main problem is in finding a way to seal the tube. I have tried sealing the tubes by melting the glass, but the heating renders the glass weakened and unable to withstand the pressure. How might I be able to seal these samples effectively? Thanks for any help.

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