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NAD+

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El dinucleótido de nicotinamida y adenina (NAD+) es una coenzima esencial presente en todas las células vivas, que actúa como transportador de electrones crítico en la fosforilación oxidativa, la producción de ATP, la reparación del ADN y las vías de señalización dependientes de calcio. Suministrado como polvo liofilizado; especificación a nivel de clase ≥98% NAD+ (forma β, por HPLC). Solo para fines de investigación. No apto para el consumo humano.

Descripción

Nicotinamide adenine dinucleotide (NAD+) is a central coenzyme in cellular energy metabolism, serving as the electron carrier in mitochondrial oxidative phosphorylation and as a substrate for a class of enzymes — sirtuins, PARPs, and CD38/CD157 ectoenzymes — that use NAD+ in non-redox signaling reactions. Its role as a sirtuin substrate is what drove the surge of interest in NAD+ biology over the past two decades: sirtuins (SIRT1-7) regulate protein deacetylation, mitochondrial biogenesis, DNA repair, and inflammatory signaling in ways that appear to overlap significantly with NAD+ and sirtuin-pathway activity. The problem is that NAD+ levels decline measurably with age across most mammalian tissues studied.

Research Context

The decline in NAD+ with aging has been attributed to increased consumption (more PARP activity in response to accumulated DNA damage, more CD38 activity during chronic inflammation) combined with reduced biosynthesis from precursors. This has made NAD+ and its precursors (NMN, NR, niacin, tryptophan) major targets in aging and metabolic research. The mechanistic questions are far from settled: which NAD+-consuming enzyme is most relevant to age-related pathology varies by tissue, and whether raising NAD+ levels achieves meaningful SIRT1 activation in vivo under normal dietary conditions is genuinely debated.

Direct NAD+ supplementation has the bioavailability challenge that the molecule is poorly membrane-permeable and is degraded in the gut. Precursor approaches (NMN, NR) have better oral bioavailability but add their own pharmacokinetic complexity. Research applications for research-grade NAD+ include cell culture experiments where you want to raise intracellular NAD+ acutely without precursor conversion kinetics, and in vivo bolus studies examining short-term NAD+-dependent signaling events.

Specifications

Parameter Value
Compound Nicotinamide adenine dinucleotide (NAD+)
Forma Lyophilized powder (free acid or sodium salt)
Pureza ≥98% (class-level specification)
Molecular weight 663.4 Da
Solubility Water-soluble
Certificado de análisis Available on request

Almacenamiento

Store at -20°C, protected from light and moisture. NAD+ is significantly less stable than its precursors NMN and NR — the adenylate ester bond is hydrolyzable under acidic conditions and NAD+ oxidizes to NADH and vice versa in non-inert atmospheres. Reconstitute in cold, pH-neutral water immediately before use and do not store reconstituted solutions. Single-use aliquots from the lyophilized stock are the practical approach for sensitive experiments.

How is intracellular NAD+ measured in research experiments?

The enzymatic cycling assay (NAD/NADH quantification kit) is the standard for cell culture work — it uses alcohol dehydrogenase to cycle NAD+ through a colorimetric or fluorometric reaction and gives absolute NAD+ and NADH values from a cell extract. Mass spectrometry-based methods provide more specific quantification with isotope-labeled internal standards and can distinguish NAD+ from its close relatives (NADH, NADP+, NADPH) simultaneously. For tissue-level NAD+ measurement in animals, tissue extraction followed by enzymatic assay is standard. Important: NAD+ is unstable ex vivo — samples must be processed within minutes of collection and immediately acidified to stabilize the oxidized form.

Does supplemented NAD+ actually reach intracellular compartments?

This is a key translational question. NAD+ is a large, charged molecule that crosses plasma membranes poorly in most cell types — it is generally assumed to enter via specific transporters or extracellular degradation to precursors (NMN, NR, Nam) followed by re-synthesis. In cell culture experiments where you add NAD+ to media, the intracellular rise you observe may reflect extracellular signaling (through cell-surface receptors, particularly NAD+-sensitive P2 receptors) or precursor recycling rather than direct membrane crossing. This should be controlled for by measuring intracellular NAD+ alongside extracellular levels and comparing to equimolar precursor conditions.

NAD+ is supplied for laboratory research. Not for human use. For research purposes only.

ParámetroValor
CompuestoDinucleótido de nicotinamida y adenina (NAD+)
FormaPolvo liofilizado (ácido libre o sal sódica)
Pureza≥98% (especificación a nivel de clase)
Peso molecular663.4 Da
SolubilidadSoluble en agua
Certificado de análisisDisponible bajo petición

No independent report is currently published for this product. A class-level specification is not an independent lot test.

Follow the storage conditions on the product label and its published documentation. Handle only in an appropriately equipped laboratory.

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Rumanía (UE). Somos CERTALAB SRL, CUI 54169956, registrada a efectos de IVA. Sameday para Rumanía, GLS para la mayoría de los destinos de la UE, TCE Worldwide para los demás mercados transfronterizos de la UE y fuera de la UE (Reino Unido, Suiza). Entrega en 1–15 días hábiles según el destino; el plazo exacto se muestra al finalizar la compra.

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Dispone de un derecho de desistimiento de 14 días en virtud de la OUG 34/2014 (legislación rumana/de la UE en materia de consumo), con posibilidad de escalado a la ANPC y de resolución alternativa de litigios (SAL). Contáctenos en support@chinapeptideshop.com.

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Información del producto

Este producto está destinado únicamente a fines de investigación y desarrollo científicos. Es una sustancia química que no debe utilizarse como fármaco, medicamento, principio activo ni ingrediente en ningún producto destinado al consumo humano o animal. Los investigadores deben manipular este compuesto de acuerdo con las directrices de bioseguridad de su institución. Utilícese únicamente en entornos de laboratorio debidamente equipados y con el equipo de protección individual adecuado.

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