LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-01-21. Anything still debated is marked as such rather than presented as settled.
Analytical identification of SR9009 typically relies on liquid chromatography coupled with tandem mass spectrometry. In biological samples, researchers first separate the compound from matrix components using protein precipitation, liquid-liquid extraction, or solid-phase extraction. High-performance liquid chromatography with ultraviolet detection and nuclear magnetic resonance spectroscopy can support structural confirmation of reference materials. Because SR9009 is a small, relatively lipophilic molecule, reverse-phase columns and acidic mobile phases are common. Laboratories often include isotope-labeled internal standards to improve quantification and to correct for ion suppression.
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
| Property | Value | Notes |
|---|---|---|
| Common synonyms | SR9009; Stenabolic | Nickname is not a chemical name. |
| Typical analytical method | LC-MS/MS | Often with isotope-labeled internal standard. |
| Storage temperature | -20 °C | Desiccated and protected from light. |
| Solution stability | DMSO stock; avoid freeze-thaw | Store at -20 to -80 °C. |
| Regulatory status | Not approved; varies by country | May be restricted as research chemical. |
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.
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.
23 October A significant breakthrough in treating cervical cancer is reported by University College London, with participants in a Phase III trial seeing a 35% reduction in the risk of both mortality or the disease returning. The study used a combination of existing, cheap drugs ahead of usual radiotherapy treatment. The Royal Mint unveil a special Christmas 50 pence coin, celebrating the 1978 picture book The Snowman by Raymond Briggs. British-Israeli Yosef Guedalia is named as another victim killed by Hamas in the 7 October attack. Sunak tells parliament the UK has judged the al-Ahli Arab Hospital explosion, which occurred on 17 October, was likely caused by "a missile, or part of one" fired from "within Gaza". COVID-19 in the UK: Hospitals ask visitors to wear face-coverings amidst a rise in COVID-19 cases. 24 October Office for National Statistics data shows that UK unemployment remained at 4.2% in the three months up to August 2023. A BBC investigation finds that UK authorities failed to act on multiple official warnings about an online forum promoting suicide connected to at least 50 UK deaths. Immigration Minister Robert Jenrick confirms that the UK government will stop using 50 hotels to accommodate asylum seekers by January 2024. Local officials subsequently warn that local authorities may be forced to pay for use of the hotels instead. The Financial Conduct Authority confirms that the cap on bankers' bonuses, introduced in 2014, will be lifted from 31 October as part of post-Brexit financial reforms.
Computational proteomics is both an interdisciplinary field and a specialization of bioinformatics which uses computational techniques to study the proteome; in particular, computational proteomics is based on peptides identification techniques and allows to integrate vast quantities of heterogeneous data referred to proteins (e.g., identification of proteins, quantification, protein-protein interactions, structures...) and genomics (e.g., expression of genes and expression of proteins). The results of both proteomics and computational proteomics are used by biomedical engineering, biotechnology and Agri-Food Studies.
Constancy testing is the verification of reference values as part of quality assurance in x-ray diagnostics, nuclear medicine diagnostics, and radiotherapy. National regulations specify which parameters are to be tested, which limits are to be observed, which test methods are to be used, and which test samples are to be used. In Germany, the Radiation Protection in Medicine Directive and the relevant DIN 6855 standard in nuclear medicine require regular (in some cases daily) constancy testing. Test sources are used to check the response of probe measuring stations as well as in vivo and in vitro measuring stations. Before starting the tests, the background count rate and the setting of the energy window must be checked every working day, and the settings and the yield with reproducible geometry must be checked at least once a week with a suitable test source, e.g. 137Caesium (DIN 6855-1). The reference values for the constancy test are determined during the acceptance test. Compact test specimens for medical X-ray images were not created until 1982. Prior to this, the patient himself often served as the object for producing X-ray test images. Prototypes of such an X-ray phantom with integrated structures were developed by Thomas Bronder at the Physikalisch-Technische Bundesanstalt. A water phantom is a Plexiglas container filled with distilled water that is used as a substitute for living tissue to test electron linear accelerators used in radiation therapy.
roeperi grows are not monocultures and other fungi, particularly yeasts, can often be found within and even seem to exceed the density of A. roeperi during certain seasons (for example, in the winter, when adult beetles remain dormant until their springtime emergence). It has been suggested that during the height of a beetle attack, the presence of ethanol – produced by stressed trees and sometimes even by the fungus itself – helps to select for the proliferation of A. roeperi over potential competitors such as molds, which are unable to effectively detoxify this compound. The distribution of A. roeperi mirrors that of its insect partner and is thus quite expansive, both in terms of hosts and geographic range. X. crassiusculus has been reported feeding on woody plants from over 40 families, though it seems to prefer non-coniferous species (with the exception of cedars, from which infestations have been reported). Perhaps in part due to its capacity for extreme polyphagy, this beetle is highly invasive and has spread beyond its native range in southeast Asia to Africa (from tropical regions to the southern tip), Australia and New Zealand, Europe, South America, and the United States, taking A. roeperi with it.
Sources: en.wikipedia.org
Based on animal research, it was initially thought that bicalutamide was unable to cross the blood–brain barrier into the central nervous system and hence would be a peripherally-selective antiandrogen in humans. This conclusion was drawn from the finding that bicalutamide reportedly does not increase LH or testosterone levels in multiple tested animal species, including rats and dogs. AR antagonists like flutamide normally do this by blocking ARs in the pituitary gland and hypothalamus in the brain and thereby disinhibiting the HPG axis. The notion that bicalutamide does not cross the blood–brain barrier is in accordance with rodent tissue distribution studies, which have found low levels of bicalutamide in the hypothalamus and cerebral cortex relative to most peripheral tissues and the pituitary gland (a part of the brain that is outside of the blood–brain barrier). In spite of the preceding studies however, other rodent studies have contradicted these results and found that bicalutamide does significantly and dose-dependently increase LH and testosterone levels, and in some studies to a similar extent as flutamide. In any case, in humans, bicalutamide has consistently been found to increase LH and testosterone levels, and to a comparable extent relative to flutamide and nilutamide. This occurs to a significant extent at even a very low dosage of 10 mg/day bicalutamide.
== Bibliography == Audi, G.; Kondev, F. G.; Wang, M.; et al. (2017). "The NUBASE2016 evaluation of nuclear properties". Chinese Physics C. 41 (3) 030001. Bibcode:2017ChPhC..41c0001A. doi:10.1088/1674-1137/41/3/030001. Beiser, A. (2003). Concepts of modern physics (6th ed.). McGraw-Hill. ISBN 978-0-07-244848-1. OCLC 48965418. Hoffman, D. C.; Ghiorso, A.; Seaborg, G. T. (2000). The Transuranium People: The Inside Story. World Scientific. ISBN 978-1-78-326244-1. Kragh, H. (2018). From Transuranic to Superheavy Elements: A Story of Dispute and Creation. Springer. ISBN 978-3-319-75813-8. Zagrebaev, V.; Karpov, A.; Greiner, W. (2013). "Future of superheavy element research: Which nuclei could be synthesized within the next few years?". Journal of Physics: Conference Series. 420 (1) 012001. arXiv:1207.5700. Bibcode:2013JPhCS.420a2001Z. doi:10.1088/1742-6596/420/1/012001. ISSN 1742-6588. S2CID 55434734.
==== Inflammatory and systemic autoimmune disorders ==== Conditions that may closely resemble polymyositis include dermatomyositis, inclusion body myositis, immune-mediated necrotizing myopathy, systemic lupus erythematous, systemic sclerosis, and Sjögren syndrome. Overlapping skin features, such as facial redness/flushing in lupus, is an example of how these conditions can cause clinical confusion when diagnosing.
Sources: en.wikipedia.org
The most common approach is liquid chromatography-tandem mass spectrometry, often after extraction from blood, urine, or tissue. Ultraviolet detection and nuclear magnetic resonance spectroscopy are used mainly for reference material characterization. Isotope-labeled internal standards improve accuracy.
Solid material is usually kept at -20 °C, desiccated, and protected from light. Dimethyl sulfoxide stocks should be stored cold and subjected to minimal freeze-thaw cycles. Aqueous solutions are generally less stable and should be prepared fresh when possible.
Legality depends on the country and the intended use. It is not an approved medicine, and some places restrict or ban sales for human consumption. Buyers should verify local rules and product documentation before procurement.
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.