LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-10-24. Anything still debated is marked as such rather than presented as settled.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
In laboratory settings, SR9009 is commonly identified by its molecular structure and its interaction with REV-ERB receptors. Vendors may list it under synonyms such as Stenabolic or REV-ERB agonist, but those names do not define purity or identity. Analytical confirmation typically uses high-performance liquid chromatography with ultraviolet detection or liquid chromatography–mass spectrometry. A reference standard is needed to compare retention time and mass spectrum, because the compound can be confused with related research chemicals.
Storage recommendations for SR9009 reference material typically specify a freezer at -20 °C or lower, with protection from moisture and light. Repeated freeze-thaw cycles can degrade small molecules and introduce variability. Stock solutions in dimethyl sulfoxide are often aliquoted to avoid repeated handling. Stability studies may examine degradation under heat, humidity, and light exposure. The compound's thiophene and nitro groups can participate in reactions that alter analytical signals over time, so such changes affect quantitative results.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Visual inspection is not sufficient for identity. |
| Solubility | Soluble in DMSO and ethanol | Low solubility in water. |
| Typical storage | -20 °C, desiccated, dark | Protect from repeated temperature changes. |
| Common analytical method | LC-MS or HPLC-UV | Reference standard required for comparison. |
| Common synonyms | SR9009; Stenabolic; REV-ERB agonist | Vendor naming may vary. |
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.
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.
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
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.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
In February 1968, ruling on Madzimbamuto's appeal, Beadle concluded that the Smith administration would be recognised by the local judiciary as the de facto government by virtue of its "effective control over the state's territory", but that de jure recognition would be withheld as this was not "firmly established". Madzimbamuto applied for the right to appeal to the British Privy Council; the Rhodesian Appellate Division promptly ruled that he had no right to do so, but the Privy Council considered his case anyway. In late February 1968, considering the fate of James Dhlamini, Victor Mlambo and Duly Shadreck, three black Rhodesians convicted of murder and terrorist offences before UDI, Beadle ruled that Salisbury retained its pre-UDI powers regarding executions and could carry out death sentences. Whitehall announced on 1 March that at the request of the UK government, the Queen had exercised the royal prerogative of mercy and commuted the three death sentences to life imprisonment. Dhlamini and the others applied for a permanent stay of execution on this basis. At the hearing for Dhlamini and Mlambo on 4 March 1968, Beadle argued that he saw the statement from London as a decision by the UK government and not the Queen herself, and that in any case the 1961 constitution had transferred the prerogative of mercy from Britain to the Rhodesian Executive Council. "The present government is the fully de facto government and as such is the only power that can exercise the prerogative", he concluded.
Studies indicate that the drug also acts pro-apoptotically through the CD95 receptor, which affects the activation of caspases 8 and 3. In multiple myeloma cells, arsenic trioxide interacts with the APO2/TRAIL receptor, activating caspases 8 and 9. Arsenic trioxide also affects the intracellular concentration of glutathione, which is a crucial component of the redox system (it removes radicals and reduces hydrogen peroxide). It also participates, along with peroxidase and catalase, in regulating the levels of reactive oxygen species. Arsenic trioxide inhibits glutathione peroxidase, thereby decreasing its concentration in the cell, which leads to an increase in the levels of reactive oxygen species. These, in turn, increase the permeability of the mitochondrial membrane, causing the release of apoptotic factors and initiating the apoptosis process.
A neurotransmitter is a signaling molecule secreted by a neuron to affect another cell across a synapse. The cell receiving the signal, or target cell, may be another neuron, but could also be a gland or muscle cell. Neurotransmitters are released from synaptic vesicles into the synaptic cleft where they are able to interact with neurotransmitter receptors on the target cell. Some neurotransmitters are also stored in large dense core vesicles. The neurotransmitter's effect on the target cell is determined by the receptor it binds to. Many neurotransmitters are synthesized from simple and plentiful precursors such as amino acids, which are readily available and often require a small number of biosynthetic steps for conversion. Neurotransmitters are essential to the function of complex neural systems. The exact number of unique neurotransmitters in humans is unknown, but more than 100 have been identified. Common neurotransmitters include glutamate, GABA, acetylcholine, glycine, dopamine and norepinephrine.
The Santuario della Consolata, a sanctuary much frequented by pilgrims, stands on the site of the 10th-century Monastery of St. Andrew, and is a work by Guarini. It was sumptuously restored in 1903. Outside the city are: the Basilica of Our Lady, Help of Christians built by St. John Bosco, the Gran Madre built in 1818 on occasion of the return of King Victor Emmanuel I of Sardinia and Santa Maria del Monte (1583) on Monte dei Cappuccini. In the hills overlooking the city, the Basilica of Superga provides a view of Turin against a backdrop of the snow-capped Alps. The basilica holds the tombs of many of the dukes of Savoy, as well as many of the kings of Sardinia. Superga can be reached by means of the Superga Rack Railway from Sassi suburb. The Basilica of Superga was built by Amadeus II of Savoy as an ex-voto for the liberation of Turin (1706), and served as a royal mausoleum since 1772.
Sources: en.wikipedia.org
== Types == Fomentations – heated poultices – may be used to promote blood circulation to an affected area; these may be unmedicated. Cold poultices are sometimes used. An example is the use of cabbage leaves to reduce breast engorgement in breastfeeding mothers. The leaves are applied directly to the breast, often simply held in place by a bra. Evidence for effectiveness as a treatment is weak: cabbage poultices are about as effective as the frequent, unrestricted feeding of the infant; they have no effect on the rate of progression to mastitis. There is some slight evidence that cabbage poultices reduce the pain of engorgement.
== History == Polymers have been essential components of commodities since the early days of humankind. The use of wool (keratin), cotton and linen fibres (cellulose) for garments, paper reed (cellulose) for paper are just a few examples of how ancient societies exploited polymer-containing raw materials to obtain artefacts. The latex sap of "caoutchouc" trees (natural rubber) reached Europe in the 16th century from South America long after the Olmec, Maya and Aztec had started using it as a material to make balls, waterproof textiles and containers. The chemical manipulation of polymers dates back to the 19th century, although at the time the nature of these species was not understood. The behaviour of polymers was initially rationalised according to the theory proposed by Thomas Graham which considered them as colloidal aggregates of small molecules held together by unknown forces. Notwithstanding the lack of theoretical knowledge, the potential of polymers to provide innovative, accessible and cheap materials was immediately grasped. The work carried out by Braconnot, Parkes, Ludersdorf, Hayward and many others on the modification of natural polymers determined many significant advances in the field. Their contributions led to the discovery of materials such as celluloid, galalith, parkesine, rayon, vulcanised rubber and, later, Bakelite: all materials that quickly entered industrial manufacturing processes and reached households as garments components (e.g., fabrics, buttons), crockery and decorative items.
The team won the 1998 CARICOM Men's Basketball Championship, held at the Civic Centre in Belize City, and subsequently participated in the 1999 Centrobasquet Tournament in Havana. The national team finished seventh of eight teams after winning only 1 game despite playing close all the way. In a return engagement at the 2000 CARICOM championship in Barbados, Belize placed fourth. Shortly thereafter, Belize moved to the Central American region and won the Central American Games championship in 2001. The team has failed to duplicate this success finishing with a 2–4 record in the 2006 COCABA championship. The team finished second in the 2009 COCABA tournament in Cancun, Mexico where it went 3–0 in group play. Belize won its opening match in the Centrobasquet Tournament, 2010, defeating Trinidad and Tobago, but lost badly to Mexico in a rematch of the COCABA final. A tough win over Cuba set Belize in position to advance, but they fell to Puerto Rico in their final match and failed to qualify. Chess is played in Belize, with the country having national governing bodies for the sport: Belize Chess Federation and Belize National Youth Chess Foundation.
== Dental research == Research in oral medicine at the institution can be traced to the medical and dental research section established at West China Union University in 1936. It subsequently developed into an oral-disease research section, the Research Institute of Stomatology in 1958, and a central stomatology laboratory in 1983. In 2007, the Ministry of Science and Technology of China approved the establishment of the State Key Laboratory of Oral Diseases (口腔疾病研究国家重点实验室) at the institution; the laboratory was renamed the State Key Laboratory of Oral Disease Prevention and Control (口腔疾病防治全国重点实验室) in 2023. Other research infrastructure associated with the school and hospital has included the National Clinical Research Center for Oral Diseases (口腔疾病国家临床医学研究中心), an engineering laboratory for oral regenerative medicine, an international cooperative research center, and clinical-trial facilities. The institution is also associated with several academic journals. The International Journal of Oral Science is co-sponsored by the West China School of Stomatology and the State Key Laboratory of Oral Diseases, with its editorial office based at the school. The school also established the journal Bone Research, which is published in partnership with Springer Nature.
=== Shortage === In the US, some compounding pharmacies prepare compounded versions of a drug on the FDA's drug shortages list if the compounded drug meets certain conditions detailed in federal law. The US Food and Drug Administration (FDA) declared a shortage of tirzepatide in December 2022. It declared the shortage over in October 2024, but enforcement was delayed until the end of 2024, after a lawsuit by compounding pharmacies challenged the declaration. The US National Association of Boards of Pharmacy says there are tens of thousands of online pharmacies operating out of compliance with state and federal regulations or the association's recommendations. The FDA has not evaluated these for safety and effectiveness and they are thus considered not to have been shown to be safe or effective.
Sources: en.wikipedia.org
== History == Tenascin-X (TNX) protein was discovered during studies of human steroidogenesis and its disorders, particularly in patients with 21-hydroxylase deficiency, rather than during studies of connective tissue disorders. Researchers sequenced a 2.7 kb cDNA clone that showed similarities to tenascin, leading to the identification of the XB gene. This gene was initially called "Gene X" because its nature and function were unknown at the time. Further research revealed that this gene encodes the Tenascin-X protein, which belongs to the family of tenascins.
===== Type 2M ===== VWD Type 2M results from a loss-of-function mutation in von Willebrand factor (VWF). This mutation leads to reduced binding of VWF with GP1b (similar to VWD Type 2A) or with collagen. Like other Type 2 VWD subtypes, there is a decreased ratio of VWF Activity to antigen. Differentiating VWD Type 2M from Type 2A involves analyzing VWF multimers through electrophoresis. In VWD Type 2M, all multimers are identified but uniformly decreased in quantity, resembling the pattern seen in VWD Type 1. Conversely, in VWD Type 2A, high molecular weight multimers are either absent or present in very low quantities. VWD Type 2M can be further differentiated from VWD Type 1 based on the VWF Activity to antigen ratio. In Type 1, the ratio is >0.7. In Type 2M, the ratio is <0.7. In Type 2M, factor VIII activity can be normal or low while the ristocetin-induced platelet aggregation (RIPA) is typically low. It is uncommon and manifests with moderate to severe bleeding. The disease may follow either an autosomal dominant or recessive pattern of inheritance.
== Composition == The substance is primarily composed of polysaccharides, including galactose, rhamnose, and α-glucuronic acid. It also contains dietary fiber, carbohydrates, proteins, and small amounts of vitamins. Despite marketing claims, peach gum does not contain collagen, which is exclusive to animal tissues.
Collagen, type II, alpha 1 (primary osteoarthritis, spondyloepiphyseal dysplasia, congenital), also known as COL2A1, is a human gene that provides instructions for the production of the pro-alpha1(II) chain of type II collagen.
Sources: en.wikipedia.org
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.
The solid is usually kept desiccated at -20 °C or lower and protected from light. Stock solutions are aliquoted to limit freeze–thaw cycles. Aqueous solutions are not generally recommended for long-term storage.
Laws differ by country and by intended use. It is not an approved medicine, and many vendors sell it as a research chemical. Purchasers are responsible for confirming local restrictions.
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.