LC-MS/MS raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-06-21. Anything still debated is marked as such rather than presented as settled.
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.
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.
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, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | -20 °C or lower | Desiccated and protected from light |
| Common analytical method | LC-MS/MS | Detects parent drug and metabolites |
| Solubility class | Lipophilic; soluble in organic solvents | Low aqueous solubility |
| Molecular weight | 437.94 g/mol | Calculated from reported formula |
| Synonyms | SR9009; REV-ERB agonist | Code name used in scientific literature |
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 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.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
Regulatory agencies have not approved SR9009 for human therapeutic use. It is typically sold as a research chemical with labels stating that it is not for human consumption. The World Anti-Doping Agency prohibits the substance in sport, generally under the category of non-approved substances. Customs and national laws may restrict importation, sale, or possession. Product quality and legal status can vary by country and vendor, and therapeutic claims are not permitted in regulated advertising because the compound lacks approval.
Das Präparieren von Tieren wird ausführlich beschrieben. Die Figur Barry aus dem Film Dinner für Spinner ist ausgebildeter Taxidermist, der als Hobby Mäuse präpariert. In der Fernsehserie Bates Motel erlernt die Hauptfigur Norman Bates das Präparieren vom Vater seiner Freundin und verfolgt das Hobby dann intensiv im eigenen Keller.
== Literatur == Christine Becker: Wie ein zweites Leben. Der Tierbildner Herman H. ter Meer. Passage-Verlag, Leipzig 2004, ISBN 3-932900-95-2. Friedrich Kerz: Das Sammeln, Präparieren und Aufstellen der Wirbeltiere. Eine gemeinverständliche Anleitung. Strecker & Schröder, Stuttgart 1912. Gerhard Schröder: Das Sammeln, Konservieren und Aufstellen von Wirbeltieren, Verlag P. Parey, 1936 Susanne Köstering: Natur zum Anschauen. Das Naturkundemuseum des deutschen Kaiserreichs, 1871–1914. Böhlau, Köln 2003, ISBN 3-412-04702-3. Leopold Martin: Die Praxis der Naturgeschichte. Ein vollständiges Lehrbuch über das Sammeln lebender und todter Naturkörper; deren Beobachtung, Erhaltung und Pflege im freien und gefangenen Zustand; Konservation, Präparation und Aufstellung in Sammlungen etc. Voigt, Weimar 1870 ff. Taxidermie, oder die Lehre vom Konservieren, Präparieren und Naturalien sammeln, Ausstopfen und Aufstellen der Thiere. 1869. Dermoplastik und Museologie, oder das Modellieren der Thiere und das Aufstellen und Erhalten von Naturaliensammlungen. 1870. Atlas zur „Praxis der Naturgeschichte“. 1878 (2 Bände). Rudolf Piechocki: Makroskopische Präparationstechnik. Leitfaden für das Sammeln, Präparieren und Konservieren. Gustav Fischer Verlag, Jena 1984/86. Wirbeltiere. 4. Aufl. 1986, ISBN 3-437-11030-6. Wirbellose. 3. Aufl. 1984, ISBN 3-437-10803-4. Hans Völkel: Hermann H. ter Meer. Ein Leben als Dermoplastiker und Künstler. Leipziger Universitätsverlag, Leipzig 2004, ISBN 3-937209-50-6. Troxler, Martin; Schneppat, Ulrich: Hautkonservierung, Handbuch für das zoologische Präparatorium.
Verband Deutscher Präparatoren e. V. Heike Worth: Wer den Vogel hat... Präparation von Vögeln und Säugetieren. AG Evolution und Systematik der Tiere, Universität Marburg Film über Tierpräparation Bochumschau, Dez. 2011 Anastasia Fedotova, Ekaterina Zharova: Of a Practical Zoologist Augustus Szusterus in Rus, Antropologicheskij forum, Oktober 2024 (englisch).
Holzleime sind Klebstoffe aus natürlichen oder synthetischen Grundstoffen zum Verbinden von Holz und Holzwerkstoffen. Pulverleim bezeichnet heute meist Harnstoff-Formaldehyd-Leime. Aber auch traditionelle Leime wie Heißleim und Kaseinleim wurden in der Regel als Pulver oder Granulat (Perlleim) geliefert. Pulverleime reagieren meist mit der Luftfeuchtigkeit und sind darum nicht unbegrenzt lagerfähig. Alle modernen Leime sind Kaltleime. Heiß- bzw. Warmleime werden aus Kollagen hergestellt (Glutinleim, Knochenleim, Hautleim, Hasenleim). Leim aus anderen (tierischen) Eiweissen wie Kaseinleim, Blutalbuminleim und Fischleim kann hingegen kalt verarbeitet werden. Siehe auch den Abschnitt Verarbeitung. Fast alle Holzleime erreichen bei dünnen Fugen bessere Festigkeitswerte. Die Verleimung sollte bis zur Aushärtung des Leims verpresst werden, um die Fugenstärke zu minimieren, z. B. mit Schraubzwingen. Bei aufschäumenden Leimen wird dadurch zugleich vermieden, dass der Leim die Teile auseinandertreibt. Der aus den Fugen quellende Leim wird später mit dem Stechbeitel abgestoßen. Sichtflächen müssen anschließend meist abgeschliffen werden, um Leimreste zu entfernen. Mit einkomponentigen Holzleimen können nicht ausschließlich dampfdichte Stoffe verleimt werden. Zumindest eines der verleimten Werkstücke muss porös und saugfähig sein, um das aus dem Leim austretende Lösemittel aufzunehmen oder die zur Aushärtung benötigte Luftfeuchte passieren zu lassen. Mit 2-komponentige Leimen ohne Wasseranteil können auch Materialien verklebt werden, die weder saugfähig noch diffusionsoffen sind.
Sources: de.wikipedia.org
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.
Research samples are typically kept frozen, desiccated, and protected from light. Stock solutions are often aliquoted to reduce freeze-thaw cycles.
High-performance liquid chromatography and nuclear magnetic resonance are standard for purity and identity. Mass spectrometry confirms molecular weight.
SR9009 is a synthetic small molecule studied as an agonist of the REV-ERB nuclear receptors. It is not an approved medicine, and its effects in humans are not well characterized.