LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-08-25. Anything still debated is marked as such rather than presented as settled.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Typical for research-grade material |
| Solubility | Soluble in DMSO and ethanol; low aqueous solubility | Organic stock solutions are common |
| Typical storage temperature | -20 °C or lower | Protect from light and moisture |
| Common analytical method | LC-MS/MS | Used for detection and confirmation |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
In rodent studies, SR9009 has been reported to increase mitochondrial content in skeletal muscle and improve exercise endurance under some conditions. These findings led to popular descriptions such as an exercise mimetic, although that term oversimplifies the biology. Effects vary by dose, timing, tissue, and model. The compound's influence on circadian pathways means that time of administration can matter in experiments. Whether similar metabolic changes occur in humans remains largely unexplored in controlled published trials.
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.
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 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.
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.
== Histology == Skin samples under a microscope show thinned epidermis, reduced collagen, and extravasation of red blood cells. There are typically no inflammatory cells seen on solar purpura samples, but not always.
The black-necked spitting cobra (Naja nigricollis) is a species of spitting cobra found mostly in Sub-Saharan Africa. They possess medically significant venom, although the mortality rate for untreated bites on humans is relatively low (~5–10%). Like other spitting cobras, this species is known for its ability to project venom at a potential threat. The venom is an irritant to the skin and eyes. If it enters the eyes, symptoms include extreme burning pain, loss of coordination, partial loss of vision and permanent blindness. N. nigricollis is known for its tendency to liberally spit venom with only the slightest provocation. However, this aggressiveness is counterbalanced by it being less prone to bite than other related species. The venom of the black-necked spitting cobra is somewhat unique among elapids in that it consists primarily of cytotoxins, but with other components also. It retains the typical elapid neurotoxic properties while combining these with highly potent cytotoxins (necrotic agents) and cardiotoxins. Bite symptoms include severe external hemorrhaging and tissue necrosis around the bite area and difficulty breathing. Although mortality rate in untreated cases is low (~5–10%), when death occurs it is usually due to asphyxiation by paralysis of the diaphragm. The LD50 of this species is 2 mg/kg SC and 1.15 mg/kg IV. The average venom yield per bite of this species is 200 to 350 mg (dry weight) according to Minton (1974).
Major Force reappears in Battle for Blüdhaven, a series set a year after the events of Infinite Crisis, as the leader of project S.H.A.D.E. In issue #5, Major Force brutally beats Outsiders member Major Victory and rips off his right arm. He also picks a fight with Hal Jordan, having vowed to kill Green Lanterns on sight after his last encounter with Kyle Rayner. Captain Atom drains Major Force of his energy, leaving him a deflated husk. Major Force is later seen reconstituted and a part of a new regiment of S.H.A.D.E. soldiers. A battle ensues with Uncle Sam and the Freedom Fighters for the soul of America, wherein Major Force is quickly dispatched by Miss America. Major Force later appears as a member of the Secret Society during the wedding of Green Arrow and Black Canary.
In 1912, Frederick Gowland Hopkins demonstrated that unknown accessory factors found in milk, other than carbohydrates, proteins, and fats were necessary for growth in rats. Hopkins received a Nobel Prize for this discovery in 1929. One year later, Elmer McCollum, a biochemist at the University of Wisconsin–Madison, and colleague Marguerite Davis identified a fat-soluble nutrient in butterfat and cod liver oil. Their work confirmed that of Thomas Burr Osborne and Lafayette Mendel, at Yale, also in 1913, which suggested a fat-soluble nutrient in butterfat. The "accessory factors" were termed "fat-soluble" in 1918 and later "vitamin A" in 1920. In 1931, Swiss chemist Paul Karrer described the chemical structure of vitamin A. Retinoic acid and retinol were first synthesized in 1946 and 1947 by two Dutch chemists, David Adriaan van Dorp and Jozef Ferdinand Arens. In 1967, George Wald was a co-recipient of the Nobel Prize in Physiology and Medicine "..."for their discoveries concerning the primary physiological and chemical visual processes in the eye." Photoreceptor cells in the eye contain a chromophore composed of the protein opsin and 11-cis retinal. When struck by light, 11-cis retinal undergoes photoisomerization to all-trans retinal and via signal transduction cascade sends a nerve signal to the brain. The all-trans retinal is reduced to all-trans retinol and travels back to the retinal pigment epithelium to be recycled to 11-cis retinal and conjugated to opsin.
As demand for consumer goods increased after World War II, the resulting shortage helped overcome lingering resistance to the purchase of German products. At the time, Germany had a large pool of skilled and cheap labour, partly as a result of the flight and expulsion of Germans from Central and Eastern Europe, which affected up to 16.5 million Germans. This helped Germany to more than double the value of its exports during the war. Apart from these factors, hard work and long hours at full capacity among the population and in the late 1950s and 1960s extra labour supplied by thousands of Gastarbeiter ("guest workers") provided a vital base for the economic upturn. This would have implications later on for successive German governments as they tried to assimilate this group of workers. With the dropping of Allied reparations, the freeing of German intellectual property and the impact of the Marshall Plan stimulus, West Germany developed one of the strongest economies in the world, almost as strong as before the Second World War. The East German economy showed a certain growth, but not as much as in West Germany, partly because of continued reparations to the USSR. In 1952, West Germany became part of the European Coal and Steel Community, which would later evolve into the European Union. On 5 May 1955 West Germany was declared to have the "authority of a sovereign state". The British, French and US militaries remained in the country, just as the Soviet Army remained in East Germany.
Sources: en.wikipedia.org
== Clinical significance == Mutations in ADNP are the cause of ADNP syndrome. Although it is unclear how mutations in the ADNP gene affect ADNP protein function, researchers suggest that the mutations result in abnormal chromatin remodeling. Disturbance of this process alters the activity of many genes and disrupts development or function of several of the body's tissues and organs, including the brain.
== History == SPAR began in 1994 at the New England Deaconess Hospital (now Beth Israel Deaconess Medical Center) as a support group for couples wishing to parent when one of them had an incurable sexually transmitted disease. The patient couples began raising money to fund the research needed to develop the methods to improve the safety of attempting pregnancy. By 1996 sufficient funds were available to begin, but a merger between the Beth Israel Hospital and the New England Deaconess Hospital (now Beth Israel Deaconess Medical Center) necessitated the creation of an independent Massachusetts public charity, the Assisted Reproduction Foundation (now the Bedford Stem Cell Research Foundation directed by Dr. Ann Kiessling), to continue the work. Within two years, the methods for reducing, and perhaps eliminating, the risks of infection to the mother and the child were developed and Baby Ryan was born in 1999. The goal of SPAR was to provide semen testing by experts that would ensure improved safety of sperm that could then be shipped to infertility clinics near the couple's home. In this way, couples could be cared for in the same manner as other couples in their community. Fortunately, a few clinics were willing to help with this effort, and by 2002, seven collaborating clinics around the country were caring for couples living with HIV disease. In the Spring of 2000 a ground breaking study was completed, giving significant insight to the role of semen producing organs in HIV anti-viral therapy.
=== Radiation === Foods are often irradiated to kill harmful pathogens. There are two types of radiations that are used to inhibit the growth of microorganisms – ionizing and non-ionizing radiations. Common sources of radiation used in food sterilization include cobalt-60 (a gamma emitter), electron beams and X-rays. Ultraviolet light is also used to disinfect drinking water, both in small-scale personal-use systems and larger-scale community water purification systems.
=== Soviet military perspective === The Soviet military was focused on its main mission, the defense of the Soviet Union. From that perspective, the formation of NATO in 1949 was the decisive threat, and became its starting point for the Cold War. Historian David Glantz argues that:
Sources: en.wikipedia.org
As an antifungal, ketoconazole is structurally similar to imidazole, and interferes with the fungal synthesis of ergosterol, a constituent of fungal cell membranes, as well as certain enzymes. As with all azole antifungal agents, ketoconazole works principally by inhibiting the enzyme cytochrome P450 14α-demethylase (CYP51A1). This enzyme participates in the sterol biosynthesis pathway that leads from lanosterol to ergosterol. Lower doses of fluconazole and itraconazole are required to kill fungi compared to ketoconazole, as they have been found to have a greater affinity for fungal cell membranes. Resistance to ketoconazole has been observed in a number of clinical fungal isolates, including Candida albicans. Experimentally, resistance usually arises as a result of mutations in the sterol biosynthesis pathway. Defects in the sterol 5-6 desaturase enzyme reduce the toxic effects of azole inhibition of the 14-alpha demethylation step. Multidrug-resistance (MDR) genes can also play a role in reducing cellular levels of the drug. As azole antifungals all act at the same point in the sterol pathway, resistant isolates are normally cross-resistant to all members of the azole family.
== Uses == Irradiation is used to reduce or eliminate pests and the risk of food-borne illnesses as well as prevent or slow spoilage and plant maturation or sprouting. Depending on the dose, some or all of the organisms, microorganisms, bacteria, and viruses present are destroyed, slowed, or rendered incapable of reproduction. When targeting bacteria, most foods are irradiated to significantly reduce the number of active microbes, not to sterilize all microbes in the product. Irradiation cannot return spoiled or over-ripe food to a fresh state. If this food was processed by irradiation, further spoilage would cease and ripening would slow, yet the irradiation would not destroy the toxins or repair the texture, color, or taste of the food. Irradiation slows the speed at which enzymes change the food. By reducing or removing spoilage organisms and slowing ripening and sprouting (e.g. potato, onion, and garlic) irradiation is used to reduce the amount of food that goes bad between harvest and final use. Shelf-stable products are created by irradiating foods in sealed packages, as irradiation reduces chance of spoilage, the packaging prevents re-contamination of the final product. Foods that can tolerate the higher doses of radiation required to do so can be sterilized. This is useful for people at high risk of infection in hospitals as well as situations where proper food storage is not feasible, such as rations for astronauts.
== External links == International Chemical Safety Card 1193 CID 516889 from PubChem ATC codes: A02AC01 (WHO) and A12AA04 (WHO) The British Calcium Carbonate Association – What is calcium carbonate Archived 24 May 2008 at the Wayback Machine CDC – NIOSH Pocket Guide to Chemical Hazards – Calcium Carbonate
Sources: en.wikipedia.org
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.
Liquid chromatography with tandem mass spectrometry is widely used to detect and confirm SR9009 in laboratory samples. The technique offers high sensitivity and can distinguish the target compound from related substances. Nuclear magnetic resonance and ultraviolet detection may support identity and purity checks.
Online products labeled as SR9009 may vary in identity, purity, and actual content. Independent testing helps confirm that a sample matches its label and does not contain unexpected contaminants. This is important for reproducible research and for interpreting experimental results.
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.