A practical reference on LC-MS: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-06-10. Anything still debated is marked as such rather than presented as settled.
REV-ERB proteins help regulate daily cycles in gene expression, including genes tied to lipid and glucose metabolism. SR9009 binds these receptors and alters their activity in cell and animal experiments. Consequences observed in rodents include changes in skeletal muscle oxidative capacity, blood lipid levels, and exercise performance. The precise chain from receptor occupancy to whole-body effects is still an active area of study. Human responses cannot be assumed from rodent data.
Most published work on SR9009 consists of preclinical studies. It is widely sold as a research chemical, a category that does not imply safety, efficacy, or pharmaceutical-grade quality. Sports anti-doping organizations have listed SR9009 as a prohibited substance, and its presence in an athlete sample can lead to sanctions. Legal status differs by country; in several jurisdictions it is not approved for human consumption and may be treated as an unapproved new drug.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is not a steroid, peptide, or natural hormone. In scientific literature, it appears under the code SR9009 and in non-scientific contexts as Stenabolic. The compound was identified through chemical screening efforts aimed at targeting circadian clock components. Its status remains investigational, and no regulatory agency has approved it as a human medicine.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
| Property | Value | Notes |
|---|---|---|
| Common name | SR9009 | Also referred to as Stenabolic in non-scientific contexts. |
| Chemical class | Synthetic small molecule | Not a steroid or peptide hormone. |
| Receptor target | REV-ERBα and REV-ERBβ | Nuclear receptor agonist in preclinical studies. |
| Development status | Investigational | No approved human therapeutic indication. |
| Regulatory attention | Prohibited in sport | Listed by anti-doping authorities. |
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
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.
SR9009 stability depends on temperature, moisture, light, and solvent. Solid material is generally kept cool and dry, while solutions may require protection from repeated warming and cooling. Degradation can appear as color changes, precipitate, or new chromatographic peaks. Researchers should follow supplier instructions and their own stability data. Long-term storage conditions for human use have not been established because the compound lacks approved clinical formulation.
== External links == Diego blood group system at BGMUT Blood Group Antigen Gene Mutation Database at NCBI, NIH Band+3+Protein at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Chloride-Bicarbonate+Antiporters at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Human SLC4A1 genome location and SLC4A1 gene details page in the UCSC Genome Browser.
C4H2N2O4 + GSH → C4H3N2O4• + GS• C4H3N2O4• + GSH → C4H4N2O4 + GS• C4H4N2O4 + O2 → C4H3N2O4• + O2•− + H+ C4H3N2O4• + O2 → C4H2N2O4 + O2•− + H+ Because it selectively kills the insulin-producing beta-cells found in the pancreas, alloxan is used to induce diabetes in laboratory animals. This occurs most likely because of selective uptake of the compound due to its structural similarity to glucose as well as the beta-cell's highly efficient uptake mechanism (GLUT2). In addition, alloxan has a high affinity to SH-containing cellular compounds and, as a result, reduces glutathione content. Furthermore, alloxan inhibits glucokinase, a SH-containing protein essential for insulin secretion induced by glucose. Most studies have shown that alloxan is not toxic to the human beta-cell, even in very high doses, probably because of differing glucose uptake mechanisms in humans and rodents. Alloxan is, however, toxic to the liver and the kidneys in high doses, as these are tissues where the GLUT2 transporter is expressed in humans. Streptozotocin
The number of 60Fe atoms per unit area found on Earth can be estimated if the typical amount of 60Fe ejected from a supernova is known. This can be done by dividing the surface mass density (Σej) by the atomic mass of 60Fe.
=== Pharmacokinetics === The metabolism and metabolites of SDMA have been studied. It showed more rapid clearance than MDMA in rodents and hence may have a shorter elimination half-life and/or duration.
=== Endocrine === Hormone levels have been reported in gonadally intact people with CAIS in a number of studies. Hormone levels are similar to those of males, including high testosterone levels and relatively low estradiol levels. However, luteinizing hormone (LH) levels are elevated while sex hormone-binding globulin (SHBG) levels are more consistent with those of females. People with CAIS have low levels of progesterone similarly to males. The production rates of testosterone, estradiol, and estrone have been reported to be higher in gonadally intact with CAIS than in men.
Sources: en.wikipedia.org
=== Theoretical === The theory of general chromatography applies to HPLC. This theory is the basis for system-suitability tests of the United States Pharmacopoeia, which are a set of quantitative criteria for how suitable a HPLC system is to the required analysis at any step of it. This relation is also represented as a normalized unit-less factor known as the retention factor, or retention parameter, which is the experimental measurement of the capacity ratio, as shown in the Figure of Performance Criteria as well. tR is the retention time of the specific component and t0 is the time it takes for a non-retained substance to elute through the system without any retention, thus it is called the Void Time. The ratio between the retention factors, k', of every two adjacent peaks in the chromatogram is used in the evaluation of the degree of separation between them, and is called selectivity factor, α, as shown in the Performance Criteria graph. The plate count N as a criterion for system efficiency was developed for isocratic conditions, i.e., a constant mobile phase composition throughout the run. In gradient conditions, where the mobile phase changes with time during the chromatographic run, it is more appropriate to use the parameter peak capacity Pc as a measure for the system efficiency. The definition of peak capacity in chromatography is the number of peaks that can be separated within a retention window for a specific pre-defined resolution factor, usually ~1. It could also be envisioned as the runtime measured in number of peaks' average widths.
==== Progestogenic activity ==== Many 19-nortestosterone derivatives, including nandrolone, trenbolone, ethylestrenol (ethylnandrol), metribolone (R-1881), trestolone, 11β-MNT, dimethandrolone, and others, are potent agonists of the progesterone receptor (PR) and hence are progestogens in addition to AAS. Similarly to the case of estrogenic activity, the progestogenic activity of these drugs serves to augment their antigonadotropic activity. This results in increased potency and effectiveness of these AAS as antispermatogenic agents and male contraceptives (or, put in another way, increased potency and effectiveness in producing azoospermia and reversible male infertility).
== See also == A Clinical Lesson at the Salpêtrière – 1887 group tableau portrait by André Brouillet Cranial electrotherapy stimulation – Form of neurostimulation Electrical brain stimulation – Form of electrotherapy Electroanalgesia – Pain relief by electrical means Electroconvulsive therapy – Controversial treatment for mental disorders Electrotherapy (cosmetic) – Use of electrical energy for cosmetics Galvanic bath – Alternative medical treatment Microcurrent electrical neuromuscular stimulator – Device for sending small electrical pulses into the body Neuromuscular diagnostics – Medical testing for the muscular and nervous systems Neurotherapy – Type of therapyPages displaying short descriptions of redirect targets Pulsed electromagnetic field therapy – Attempted medical therapy using electromagnetic fields Transcranial direct-current stimulation – Technique of brain electric stimulation therapy Transcranial magnetic stimulation – Brain stimulation using magnetic fields Transcutaneous electrical nerve stimulation – Therapeutic technique Vagus nerve stimulation – Medical treatment that involves delivering electrical impulses to the vagus nerve
=== First Trump administration === Sanders criticized President Trump for appointing multiple billionaires to his cabinet. He criticized Trump's rolling back President Obama's Clean Power Plan, noting the scientifically reported effect on climate change of human activity and citing Trump's calling those reports a hoax. He called for caution on the Syrian Civil War, saying, "It's easier to get into a war than out of one." In 2017, he promised to defeat "Trump and Trumpism and the Republican right-wing ideology". Sanders gave an online reply to Trump's January 2018 State of the Union address in which he called Trump "compulsively dishonest" and criticized him for initiating "a looming immigration crisis" by ending the Deferred Action for Childhood Arrivals program. He voiced concern about Trump's failure to mention the finding that Russia had interfered in the 2016 election and "will likely interfere in the 2018 midterms we will be holding ... Unless you have a very special relationship with Mr. Putin". On January 6, 2021, Trump supporters attacked the United States Capitol. Sanders commented: "[Trump] has made it clear that he will do anything to remain in power – including insurrection and inciting violence [and he] will go down in history as the worst and most dangerous president in history." Sanders voted to convict Trump on both articles of his first impeachment trial in 2020 (for pressuring a foreign leader to investigate Joe Biden), and again on the sole article of his second impeachment trial in 2021 (for inciting the Capitol attack).
Sources: en.wikipedia.org
=== Prenatal and newborn screening === Checking for hemoglobinopathies begins during pregnancy, with a prenatal screening questionnaire which includes, among other things, a consideration of health issues in the child's parents and close relatives. During pregnancy, genetic testing can be done on samples taken of fetal blood, of amniotic fluid, or chorionic villus sampling. A routine heel prick test, in which a small sample of blood is collected a few days after birth, can detect some forms of hemoglobinopathy.
affected relative pair Any pair of organisms which are related genetically and both affected by the same trait. For example, two cousins who both have blue eyes are an affected relative pair since they are both affected by the allele that codes for blue eyes.
Crick began to think of a solution to this problem in the line of Watson's idea that the role of RNA was overlooked. He rejected Gamow's assumption that molecules like amino acids that are too different chemically from nucleic acid that it would be structurally impossible to bind to DNA. Instead, he visualised a certain kind but unknown molecule that linked nucleic acids and carry amino acids to ribosomes to form peptide chains. As he discussed it with his colleague Sydney Brenner about the features of such molecule, Brenner was impressed with the idea and named the concept as the "adaptor hypothesis". The adaptor was then a hypothetical molecule that apparently help in an indirect interaction between DNA, RNA and amino acids during protein synthesis. As Crick explained:I don't think that anybody looking at DNA or RNA would think of them as templates for amino acids were it not for other, indirect evidence... [In one possible scheme] each amino acid would combine chemically, at a special enzyme, with a small molecule which, having a specific hydrogen-bonding surface, would combine specifically with the nucleic acid template, This combination would also supply the energy necessary for polymerisation. In its simplest form there would be 20 different kinds of adaptor molecule, one for each amino acid, and 20 different enzymes to join the amino acid to their adaptors, Sydney Brenner, with whom I have discussed this idea, calls this the "adaptor hypothesis", since each amino acid is fitted with an adaptor to go on to the template...
Spelt, being closely related to bread wheat, is a likely source of alleles to increase wheat's genetic diversity, and so improve crop yields. Analysis of the Oberkulmer cultivar of spelt found 40 alleles that could contribute to increased yield. Among the differences were spelt's larger grain size, greater fertility of tillers, and longer fruiting spikes. Pm5 is an effector-triggered resistance gene for powdery mildew.
== Function == The protein encoded by this gene is a member of the homeodomain family of DNA binding proteins. It regulates gene expression, morphogenesis, and differentiation and it also plays a role in cell cycle progression, particularly at S-phase. Several alternatively spliced transcript variants of this gene have been described, but the full-length nature of some of these variants has not been determined, and the p200 isoform of Cux1 is processed proteolytically to smaller active isoforms, such as p110. Cux1 DNA binding is stimulated by activation of the PAR2/F2RL1 cell-surface G-protein-coupled receptor in fibroblasts and breast-cancer epithelial cells to regulate Matrix metalloproteinase 10, Interleukin1-alpha, and Cyclo-oxygenase 2 (COX2) genes. Multiple reviews have detailed the tissue-specific functions and genetic interactions in Drosophila and the early characterization of the CDP in mammalian cells, expression and activity of CUX1 in the myeloid cell lineage, multiple CUX1 isoforms, modes of DNA binding, early mouse models and cell-based assays, roles of CUX1 in kidney development and homeostasis, mechanisms by which CUX1 stimulates cell migration and invasion, roles of CUX1 and CUX2 in neurons of the cortex upper layer and the paradoxical implications of CUX1 in cancer. In addition, a number of commentaries present more specific views and speculations.
Sources: en.wikipedia.org
It is a synthetic compound studied as an agonist of REV-ERB nuclear receptors. It is not an approved medicine and has mainly been examined in laboratory and animal research.
No. It is a small molecule that binds nuclear receptors involved in circadian regulation. Its classification differs from anabolic steroids or peptide hormones.
Published human clinical trial data are lacking. Most safety and activity information comes from preclinical models, so effects in people remain uncertain.
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.