NAD+: structure and analysis

What is NAD+?

NAD+ — nicotinamide adenine dinucleotide, also written NAD or nadide — is a dinucleotide coenzyme, not a peptide. It is assembled from two nucleotides joined through a pyrophosphate linkage: one half carries adenine, the other nicotinamide. Its molecular formula is C21H27N7O14P2, an average molecular weight of 663.4 g/mol and a monoisotopic mass of 663.109 Da.

In this catalogue it is supplied as a component of the Metabolic Blend, at 100 mg per vial, rather than as a standalone product. It is the largest component of that vial by mass, and the only one whose backbone is a pair of nucleotides rather than a chain of amino acids.

That distinction governs everything below it. A deletion sequence is a peptide impurity; a hydrolysis product of a pyrophosphate bond is not, and the two are found by different methods.

How is NAD+ produced?

Not a peptide, and not made by peptide synthesis. Small molecules of this kind are produced by chemical synthesis, or by fermentation followed by purification, depending on the molecule and the manufacturer — and the certificate for a batch states what was tested rather than what is assumed from the name.

The impurity classes that matter follow from the chemistry rather than from a synthesis template: residual solvents and reagents, related substances from the synthetic route, and the counter-ion, where the material is supplied as a salt. None of those is a deletion sequence, and a peptide impurity method does not detect them.

What are the molecular figures for NAD+?

Calculated from the formula C21H27N7O14P2, not measured. The average molecular weight counts the natural abundance of each element's isotopes; the monoisotopic mass is the mass of the single most abundant isotopic composition, which is the figure a mass spectrometer is usually compared against.

The expected ions follow from the monoisotopic mass by adding one proton per charge. They are a starting point for recognising a spectrum, not a substitute for one: adducts, salts, modifications and multiply charged species all move the observed m/z, and the certificate reports what was actually measured for a batch.

Adducts, salts, modifications and multiply charged species all move an observed m/z away from any figure calculated here, and a certificate reports what was measured for a batch rather than what was expected of it.

What is the sequence of NAD+?

No one-letter amino-acid sequence is published for NAD+ on this page. NAD+ is not a peptide: it is a dinucleotide coenzyme assembled from two nucleotides, so the residue-level notation used for peptides does not describe it.

What establishes the material in a specific vial is the identity method and result stated on that batch's certificate, not a notation on a reference page.

How is the identity of NAD+ confirmed?

Peptide identity methods do not apply. Confirmation is against a reference standard of the same molecule, and the adenine ring makes that practical: it absorbs strongly near 260 nm, so retention time together with absorbance is informative in a way it is not for a peptide.

Mass spectrometry can confirm the expected monoisotopic mass of 663.109 Da, and the observed ion depends on the polarity the laboratory used — the molecule carries a phosphate group, so a negative-ion measurement is as reasonable a choice as a positive-ion one. Which was used is stated on the certificate.

Which impurities can appear in NAD+?

The pyrophosphate linkage at the centre of the molecule hydrolyses far more readily than a peptide bond, which is why moisture matters more for a vial containing it than for a peptide-only product and why the desiccant is doing more work. It is also the reason the certificate's storage conditions are set by this component rather than by the peptide alongside it.

Purity in the peptide sense — one target measured as a share of total peak area — describes only the peptide in a vial like this. For NAD+ the question is a quantitation against a reference standard, and the answer belongs in its own row of the certificate with its own stated method.

What does a certificate of analysis for NAD+ report?

A certificate for a batch of this material names the batch, names the issuing laboratory, and states for each parameter both the method used and the specification the result was measured against. Identity and purity are the two core results; net peptide content states how much of the fill weight is actually peptide.

A certificate belongs to a batch, not to a product line. When a new batch is released it is tested again, and the certificate published against it is that batch's certificate — a previous batch's result is never carried forward.

Is NAD+ for human use?

No. This page describes structure and analysis. It makes no claim about what this compound does, and none should be inferred from it. Material is supplied for laboratory research use only: it is not a drug, food, dietary supplement, cosmetic or medical device, it is not for human or veterinary consumption, and no dosing, administration or reconstitution guidance is provided for any such use.

Common questions

Is NAD+ a peptide?

No. NAD+ is a dinucleotide coenzyme, built from two nucleotides joined through a pyrophosphate linkage rather than from a chain of amino acids. That is not a marketing distinction: peptide methods for identity, purity and impurity classes do not apply to it, and a certificate that characterises the Metabolic Blend with a peptide method has characterised one of its three components.

Is NAD+ sold on its own here?

No. In this catalogue NAD+ is supplied only as a component of the Metabolic Blend, at 100 mg per vial, so it has no separate size, price or certificate. The blend's product page carries the sizes and prices, and the certificate for a batch covers this component as one of its analytes.

Why does the certificate for a blend report more than one result?

Because a blend has more than one target. A single purity figure describes one molecule measured against its own impurities; in a vial with three named components you need three identities and three quantities, each against a reference standard appropriate to that molecule. What to look for is that the certificate has a row per component, with a method stated next to each result.

Is NAD+ for human or veterinary use?

No. It is supplied for laboratory research use only, and it is not a drug, food, dietary supplement, cosmetic or medical device. No dosing, administration or reconstitution guidance is provided for any human or animal use, in any channel.

References

• Nadide (NAD+) — PubChem, National Library of Medicine