LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-10-18 and is reviewed periodically as new material appears.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
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.
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
SR9009 is often grouped with compounds studied for circadian and metabolic regulation rather than with classical anabolic steroids. Its interactions with nuclear receptors differ from those of androgen receptor ligands, and its proposed mechanisms involve transcriptional control rather than direct hormone signaling. Some sources classify it as a metabolic modulator because of observed effects on energy utilization. The distinction matters for regulation and for interpreting research results across different compound classes.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
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.
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.
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.
Melanocytes and basal cells are embedded in the epidermal layer. Upon exposure to UVB rays, melanocytes will produce more melanin, a pigment that gives skin its color. UVB can cause the formation of freckles and dark spots, both of which are symptoms of photoaging; these are most common in people with fair or light skin. With frequent long-term exposure to UVB rays, signs of photoaging might appear, and precancerous lesions or skin cancer may develop as well as damage to DNA. UVA rays are able to penetrate deeper into the skin than UVB rays, damaging the dermal layer as well as the epidermal layer. The dermis is the second major layer of the skin, and it comprises collagen, elastin, and extrafibrillar matrix, which provides structural support to the skin. With chronic UVA exposure, damage to dermal collagen, elastin, and the extracellular matrix contributes to skin laxity, roughness, and wrinkling. Due to the presence of blood vessels in the dermis, UVA rays can lead to dilated or broken blood vessels, which are most commonly visible on the nose and cheeks. UVA can also damage DNA indirectly through the generation of reactive oxygen species (ROS), which include superoxide anion, peroxide, and singlet oxygen. These ROS damage cellular DNA as well as lipids and proteins.
Corneal cross-linking (CXL) with riboflavin (vitamin B2) and UV-A light is a surgical treatment for corneal ectasia such as keratoconus, PMD, and post-LASIK ectasia. It is used in an attempt to make the cornea stronger. According to a 2015 Cochrane review, there is insufficient evidence to determine if it is useful in keratoconus. In 2016, the US Food and Drug Administration approved riboflavin ophthalmic solution crosslinking based on three 12-month clinical trials.
Many cells bind to components of the extracellular matrix. Cell adhesion can occur in two ways; by focal adhesions, connecting the ECM to actin filaments of the cell, and hemidesmosomes, connecting the ECM to intermediate filaments such as keratin. This cell-to-ECM adhesion is regulated by specific cell-surface cellular adhesion molecules (CAM) known as integrins. Integrins are cell-surface proteins that bind cells to ECM structures, such as fibronectin and laminin, and also to integrin proteins on the surface of other cells. Fibronectins bind to ECM macromolecules and facilitate their binding to transmembrane integrins. The attachment of fibronectin to the extracellular domain initiates intracellular signalling pathways as well as association with the cellular cytoskeleton via a set of adaptor molecules such as actin.
== References == Fabbrocini G, De Vita V, Pastore F, et al. (April 2012). "Collagen induction therapy for the treatment of upper lip wrinkles". J Dermatolog Treat. 23 (2): 144–52. doi:10.3109/09546634.2010.544709. PMID 21810012. S2CID 34680894. Doddaballapur S (July 2009). "Microneedling with dermaroller". J Cutan Aesthet Surg. 2 (2): 110–1. doi:10.4103/0974-2077.58529. PMC 2918341. PMID 20808602. Asif, M., Kanodia, S. and Singh, K. (2016), Combined autologous platelet‐rich plasma with microneedling verses microneedling with distilled water in the treatment of atrophic acne scars: a concurrent split‐face study. J Cosmet Dermatol, 15: 434-443. doi:10.1111/jocd.12207
== Gadolinium-148 == As a pure alpha emitter with a half-life of 86.9±3.9 years (the same as plutonium-238 within error), gadolinium-148 would be ideal for radioisotope thermoelectric generators. However, gadolinium-148 cannot be economically synthesized in sufficient quantities to power a RTG.
Sources: en.wikipedia.org
=== Contraindications === Both rosiglitazone and pioglitazone are contraindicated in people with NYHA Class III and IV heart failure. They are not recommended for use in heart failure. In Europe, rosiglitazone was contraindicated for heart failure or history of heart failure with regard to all NYHA stages, for combined use with insulin and for acute coronary syndrome. The European Medicines Agency recommended on 23 September 2010 that Avandia be suspended from the European market.
The KSC stated that Thaçi played a key role in "formulating and implementing the common purpose" of the crimes, and that he "personally participated in crimes, including the arrest, arbitrary detention and interrogation of 13 parliamentarians and the arrest, detention, transfer and murder of Behajdin Allaqi." The KSC found that Thaçi had made false statements about victims and detainees and gave "false assurances of compliance with international humanitarian law on behalf of the KLA."
Planar cell polarity depends on an asymmetry created by the transmembrane proteins Van Gogh (Vang), Frizzled (Fz), and Flamingo (Fmi), as well as the cytoplasmic proteins Prickle (Pk), Dishevelled (Dsh), and Diego (Dgo). Although the proteins are initially evenly distributed around the cell, through a combination of mutual attraction and repulsion they end up grouped in two clusters at opposite ends of the cell. The proximal end contains bound Vang–Pk complexes, while the distal end contains Fz–Dsh–Dgo. The Vang and Fz proteins are bound together between neighboring cells with Fmi. Depending on the tissue, other protein complexes, such as the Fat–Dachsous (Ft–Ds) system, may also play a role in forming cell polarity. The mechanism by which the polarity direction is initially determined is unclear. The main proposed mechanisms are the concentration gradients of the Ft–Ds system, the noncanonical Wnt signaling pathway, and mechanical forces acting on the shape of the tissue.
=== Cleaning === • surface (suction cleaning by vacuum) • wet (cleaning with water or water plus detergent) • dry (cleaning with organic solvents) • spotting (treating of localized stains with wet or dry-cleaning solvents) Wet, dry, and spotting treatments should always be conducted by professionals. Vacuum maintenance of materials in open exhibit, textiles being returned to storage, and newly accessioned textiles before they are displayed or stored is best practice. Aqueous cleaning of archaeological textiles achieves "relaxation of folds and removal of surface dirt without causing further weakening of the object.”
=== Blood pressure === An early study showed that the intravenous injection of propionic acid into mice induced a brief (<5 min) hypotensive response as defined by drops in their mean arterial pressures. This response was reduced in mice that had one of their two Ffar3 genes knocked out and absent in mice that had both Ffar3 genes knocked out. A subsequent study reported that Ffar3 gene knockout mice developed abnormally high pulse pressures (i.e., systolic minus diastolic blood pressures) as well as increased amounts of cardiac collagen and elastin connective tissue and increased cardiac stiffness as evidenced by a reduced rate of heart muscle relaxation measured by pressure-volume loop analysis tau levels.
Sources: en.wikipedia.org
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
It is usually detected by LC-MS or HPLC-UV against a reference standard. In biological matrices, metabolite targeting can improve detection. No universal immunoassay is widely available.