Description
What is NAD+?
NAD+ (nicotinamide adenine dinucleotide, oxidized form) is a pyridine nucleotide coenzyme present in every living cell. Structurally, NAD+ consists of two nucleotides — one containing adenine, the other nicotinamide — joined by a pair of phosphate groups. It exists in two redox states (NAD+ and NADH) and is central to cellular electron-transfer chemistry. Molecular formula C21H27N7O14P2, molecular weight 663.43 g/mol. Solira supplies NAD+ as a lyophilized white-to-off-white powder in sealed vials for laboratory research only.
Research Context
NAD+ is studied across an extensive preclinical research literature spanning cellular metabolism, mitochondrial bioenergetics, sirtuin enzymology, and DNA-repair pathway research. Standard research models include cultured cell lines (often with mitochondrial reporter constructs), isolated mitochondrial preparations, and yeast and worm model organisms for cellular vitality studies.
NAD+ is not a peptide; it is included in Solira's cellular vitality research category because it is the primary research cofactor in this domain. Like all Solira products, NAD+ is supplied strictly for in-vitro laboratory research by qualified researchers and is not approved for human or animal use. Solira does not advise on experimental design or research methodology.
Mechanism of Action (Research Framing)
NAD+ serves as the obligate electron acceptor for a large class of enzymes (oxidoreductases) and as the substrate for several NAD+-consuming enzyme families:
- Sirtuins (SIRT1 through SIRT7) — NAD+-dependent deacylases studied in cellular metabolism, chromatin biology, and mitochondrial function research
- PARP family (PARP1, PARP2) — NAD+-consuming poly-ADP-ribose polymerases involved in the DNA damage response
- CD38 — a NAD+ glycohydrolase that has emerged as a major NAD+ consumer in research literature on age-related cellular metabolism
- SARM1 — a NAD+ cleaving enzyme studied in axon-degeneration research
Research investigations of NAD+ in cultured cells typically focus on cellular NAD+/NADH ratio measurements, sirtuin activity assays, and mitochondrial respiration measurements via Seahorse-style extracellular flux methodology. Cellular NAD+ concentrations decline measurably with age in published animal studies, which has driven a substantial body of research literature investigating NAD+ precursor compounds (nicotinamide mononucleotide, nicotinamide riboside) in research models. Researchers selecting NAD+ for in-vitro work should consult target methodology carefully — NAD+ in solution has stability characteristics distinct from those of common precursor compounds.
Standard Research Assays
Published NAD+ research commonly employs:
- Cyclic enzymatic assays for NAD+/NADH ratio measurement in cell extracts
- HPLC quantification of NAD+ and its metabolites in tissue lysates
- Sirtuin activity assays using fluorescent peptide substrates
- Seahorse XF extracellular flux analysis for mitochondrial respiration
- qPCR analysis of NAD+-pathway gene expression (NAMPT, NMNAT1-3, NRK1-2)
- Western blot for SIRT1, SIRT3, and other sirtuin family members
- Mass spectrometry-based metabolomics for NAD+ flux measurements
- Bioluminescence assays using NAD+-dependent luciferase reporters
- NMR spectroscopy for direct quantification of NAD+ in tissue extracts
- Flow cytometry analysis of NAD+-dependent enzyme activity with fluorescent substrates
- CRISPR-based functional screens for NAD+ biosynthesis pathway components
- Stable-isotope-tracer flux analysis for NAD+ metabolism research
- Computational network analysis of NAD+-dependent enzyme expression
- Real-time NAD+/NADH ratio measurement with genetically-encoded fluorescent biosensors
- Multi-omic integration of NAD+ metabolomics with transcriptomic and proteomic datasets
The mitochondrial subcellular pool of NAD+ has distinct kinetic and concentration characteristics from the cytosolic and nuclear pools, and researchers using compartment-resolved methodology should consult specialized literature on subcellular NAD+ measurement before assay design. Tissue-specific NAD+ research methodology also varies significantly across hepatic, neuronal, and skeletal-muscle preparations, with each requiring distinct extraction and quantification protocols documented in the published literature.
Why Purity Matters for Research Validity
Research-grade NAD+ must be ≥99% pure to function correctly in enzymatic assays. Common impurities include hydrolysis products (nicotinamide mononucleotide, ADP-ribose, free nicotinamide) and oxidation variants. Even small percentages of hydrolyzed material change the kinetic constants of every NAD+-dependent enzyme assay and confound the interpretation of cellular NAD+/NADH ratio measurements. A 95% pure NAD+ preparation is essentially a mixture, not a defined reagent.
Solira's ≥99% threshold preserves the experimental clarity that NAD+ enzymology research demands.
Solira's Quality Verification
Every lot of NAD+ from Solira undergoes independent third-party HPLC analysis plus mass spectrometry identity confirmation. The lot-specific Certificate of Analysis documents the lot number, methodology, and the exact purity percentage for the lot in your vial. See Solira's full verification process →
Storage & Handling
Lyophilized NAD+ is stable for 24 months or longer at −20°C in its sealed vial, protected from light, moisture, and oxidative atmosphere. The compound is particularly sensitive to humidity — research labs routinely store NAD+ vials with desiccant. Once reconstituted in research-grade buffer (typically Tris-HCl at pH 7.0–7.4), the resulting solution must be kept refrigerated and used promptly; NAD+ in aqueous solution is significantly less stable than the lyophilized form. View Solira's compound reference database →
