sample_prep_serum.nan

NAN KB, Mario Uchimiya, John Glushka, Christopher Esselman, Leandro I Ponce, Laura Morris, Arthur Edison

Published: 2023-08-03 DOI: 10.17504/protocols.io.6qpvr34epvmk/v1

Disclaimer

This protocol is developed and maintained by Network for Advanced NMR (NAN). The protocol content here is for informational purposes only and does not constitute legal, medical, clinical, or safety advice, or otherwise; content added to this protocol is not peer reviewed and may not have undergone a formal approval of any kind. Information presented in this protocol should not substitute for independent professional judgment, advice, diagnosis, or treatment. Any action you take or refrain from taking using or relying upon the information presented here is strictly at your own risk. You agree that neither the Company nor any of the authors, contributors, administrators, or anyone else associated with this protocol, can be held responsible for your use of the information contained in or linked to this protocol or any of our Sites/Apps and Services.

Abstract

This is a modified protocol for a protein precipitation method for plasma/serum samples. This protocol was originally proposed by:

Citation
Nagana Gowda GA, Raftery D 2014 Quantitating metabolites in protein precipitated serum using NMR spectroscopy. Analytical chemistry https://doi.org/10.1021/ac5005103
See also:

Citation
Beckonert O, Keun HC, Ebbels TM, Bundy J, Holmes E, Lindon JC, Nicholson JK 2007 Metabolic profiling, metabolomic and metabonomic procedures for NMR spectroscopy of urine, plasma, serum and tissue extracts. Nature protocols

Citation
Nagana Gowda GA, Raftery D 2019 Analysis of Plasma, Serum, and Whole Blood Metabolites Using 1H NMR Spectroscopy. Methods in molecular biology (Clifton, N.J.) https://doi.org/10.1007/978-1-4939-9690-2_2

Before start

Steps

1.

Day-1/2

1.1.

Thaw samples On ice or at 4°C

1.2.

Add 600µL of 100% cold methanol to 300µL of samples On ice

  • Use 1.5-mL Eppendorf tubes
  • Keep methanol cold On ice
1.3.

Vortex the samples for 0h 0m 10s

1.4.

Incubate the samples at -20°C for 0h 20m 0s

1.5.

Centrifuge the samples at 4°C at 16000rcf for 0h 30m 0s

1.6.

Transfer the supernatants to new 1.5-mL Eppendorf tubes

1.7.

Dry the samples in a speed-vac concentrator

Note
Store dried samples at -80°C until the following step if needed

2.

Day-2/2

2.1.

Thaw the samples On ice or in 4°C

2.2.

Add 600µL of the phosphate buffer to each sample

2.3.

Vortex the samples at 4°C for 0h 10m 0s

2.4.

Centrifuge the samples at 4°C for 0h 0m 10s

2.5.

Transfer 580µL to 5-mm NMR tubes

Note
No stickers/labels on the caps and tubes allowed

17.

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