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How to Evaluate a Benchtop NMR Instrument’s Technical Performance Part 4: 13C Sensitivity

After 1H, 13C is easily the next most important nuclide in the NMR periodic table; 13C measurements can provide a wealth of valuable structural info. Unfortunately, with a receptivity that is around 5,500 smaller than that of 1H, 13C is a much less sensitive nuclide. This lower sensitivity demands the maximum performance from the NMR …

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How to Evaluate a Benchtop NMR Instrument’s Technical Performance Part 3: 1H sensitivity

In my recent posts on evaluating benchtop NMR system performance, I discussed the fundamental role the static (B0) magnetic field homogeneity plays in defining the lineshape and with it the resolution performance of the instrument. However, the quality of the magnetic field affects much more than just the instrument’s lineshape and resolution: since broadening of …

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Benchtop NMR characterisation of diethyl phthalate containing land leeches repellent

In Vietnam, for the observation of animals in the jungle of the national park of Cat Tien (and in other parts of the country and in Asia), the rangers give the tourists leech socks and a repellent cream for land leeches to put on the socks. Land leeches are terrestrial blood-sucking worm-like parasites. Reading the …

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How to Evaluate a Benchtop NMR Instrument’s Technical Performance Part 2: 1H Lineshape and Resolution

In this post, I’m going to discuss a specific test for evaluating the resolution or lineshape of a benchtop NMR system. This test is measured on proton (1H) as the NMR spectrum is sensitive to the spectrometer resolution and we can make the measurement with a single scan. Resolution and lineshape refer to the width …

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How to Evaluate a Benchtop NMR Instrument’s Technical Performance

When evaluating a benchtop NMR instrument there are several key performance characteristics that have a very significant impact on how the instrument will perform in your lab. These key performance characteristics are: The spectral resolution, which is directly related to the magnet and determines the width or shape of the NMR lines (often called lineshape), …

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