Everything below concerns REV-ERB. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-09-03. Where a claim depends on a specific study, the study is described rather than over-claimed.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
SR9009 is supplied as a solid research chemical, often in milligram quantities. Laboratories typically weigh it in a controlled environment because fine powders can disperse. Stock solutions are commonly prepared in dimethyl sulfoxide and stored in small aliquots to reduce freeze-thaw cycles. Personal protective equipment and chemical fume hoods are standard when handling unknown or potent compounds. These practices address laboratory safety rather than human use.
Identity and purity of SR9009 samples are usually checked with chromatographic and spectrometric methods. High-performance liquid chromatography can separate the compound from related impurities, while mass spectrometry provides molecular mass confirmation. Nuclear magnetic resonance spectroscopy may be used for structural verification in research settings. No single method proves biological activity, and certificates of analysis should be reviewed alongside raw data. Independent testing is often needed because online products vary widely.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water; stock solutions use organic solvent. |
| Storage | -20°C, desiccated, protected from light | Limits hydrolysis and photodegradation. |
| Analytical method | HPLC-UV/MS | Used for identity and purity assessment. |
| Synonyms | SR9009, Stenabolic | Naming varies by supplier. |
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
=== 1986 analysis === Roy Mackal, a biochemist at the University of Chicago and a founding member of the International Society of Cryptozoology (as was F. G. Wood), decided to test the samples himself. In an issue of Cryptozoology in 1986, he wrote, "Gennaro carried out comparative histological examination of the tissue, and concluded that it most resembled contemporary octopus tissue. While these results were highly suggestive, further biochemical work was required for an unambiguous identification of the tissue." Mackal tested samples of the St. Augustine carcass for different amino acids and compared the results with the known amino acid composition of the tissues of a spotted dolphin, a beluga, a giant squid, and two species of octopus.
== Services == The Instituto Universitario de Restauración del Patrimonio is divided into two areas: the area of intervention in the Pictorial and Sculptural Heritage and the area of intervention in the Architectural Heritage, and a Training and Dissemination area. The area of intervention in the pictorial and sculptural heritage operates in both basic research and applied research in seeking to acquire new knowledge to develop new products, techniques, processes, methods and systems that improve existing ones. The area of intervention in the Pictorial and Sculptural Heritage consist in restoration workshops:
Carbon dioxide is colorless. At low concentrations, the gas is odorless; however, at sufficiently high concentrations, it has a sharp, acidic odor. At standard temperature and pressure, the density of carbon dioxide is around 1.98 kg/m3, about 1.53 times that of air. Carbon dioxide has no liquid state at pressures below 0.51795(10) MPa (5.11177(99) atm). At a pressure of 1 atm (0.101325 MPa), the gas deposits directly to a solid at temperatures below 194.6855(30) K (−78.4645(30) °C) and the solid sublimes directly to a gas above this temperature. In its solid state, carbon dioxide is commonly called dry ice.
Sources: en.wikipedia.org
== Chemical constituents == Chemicals isolated from Chan-hua include nucleotides and nucleosides, sterols (ergosterol, mannitol), cyclic dipeptides, sugars, polysaccharides, fatty acids, amino acids, aromatic compounds, galactomannan, adenosine, uridine, inosine, guanosine, cyclopeptides, myriocin, and inorganic elements.
antigen Any exogenous agent that, upon introduction into an immunocompetent organism, stimulates a response from the organism's immune system that results in the production of one or more antibodies which can bind to it specifically; in this sense the term is synonymous with immunogen. Antigens may be pure substances, mixtures of substances, or particulate matter such as cells or cell fragments. Broader definitions may include substances that can bind to a specific antibody but are not themselves immunogenic, i.e. those which are only able to stimulate antibody production when combined with a carrier.
I was amazed to see today in the Vorwärts an excerpt from my 'Introduction' that had been printed without my knowledge and tricked out in such a way as to present me as a peace-loving proponent of legality [at all costs]. Which is all the more reason why I should like it to appear in its entirety in the Neue Zeit in order that this disgraceful impression may be erased. I shall leave Liebknecht in no doubt as to what I think about it and the same applies to those who, irrespective of who they may be, gave him this opportunity of perverting my views and, what's more, without so much as a word to me about it.
== Fetal tolerance to noninherited maternal antigens == Fetal T cells accumulate during in utero development. Even though the fetus is exposed to noninherited maternal antigens (NIMAs), fetal CD4+ T cells are capable of alloantigen-induced proliferation, preferentially differentiating to Treg cells and preventing a fetal immune response to maternal antigens. This expanded immune tolerance persists in both mother and offspring after birth and allows microchimeric cells to be retained in tissues.
Sources: en.wikipedia.org
Liquid chromatography with mass spectrometry is a common approach. Ultraviolet detection and nuclear magnetic resonance can support identification when suitable standards are available.
The solid is generally kept cold, dry, and protected from light. Solutions are often frozen in single-use aliquots to reduce repeated freeze-thaw cycles.
It indicates a material sold for laboratory study, not for human use. The label does not guarantee pharmaceutical purity, sterility, or regulatory approval.
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.