LC-MS/MS comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Updated 2026-05-09. Numbers and descriptions here follow the published literature rather than marketing material.
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small-molecule nuclear receptor ligand |
| Appearance | Off-white to pale yellow solid | Typical for research-grade powder |
| Solubility class | Soluble in DMSO; low water solubility | Common stock solutions use organic solvent |
| Typical stock solvent | Dimethyl sulfoxide | Used for laboratory assays |
| Common analytical method | HPLC with UV or mass detection | Used for identity and purity checks |
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
REV-ERB proteins typically suppress gene expression by recruiting corepressor complexes to DNA response elements. SR9009 binds these receptors and strengthens that repressive action in cell-based assays. Studies in rodents have reported changes in lipid handling, mitochondrial function, and exercise capacity after treatment. Such findings are often cited as evidence for metabolic effects, but species differences and limited pharmacokinetic data make direct translation to humans uncertain. Researchers continue to examine which effects are robust and which depend on specific experimental conditions.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
In the case of the simians, the loss of the ability to make vitamin C may have occurred much farther back in evolutionary history than the emergence of humans or even apes, since it evidently occurred soon after the appearance of the first primates, yet sometime after the split of early primates into the two major suborders Haplorrhini (which cannot make vitamin C) and its sister suborder of non-tarsier prosimians, the Strepsirrhini ("wet-nosed" primates), which retained the ability to make vitamin C. According to molecular clock dating, these two suborder primate branches parted ways about 63 to 60 million years ago. Approximately three to five million years later (58 million years ago), only a short time afterward from an evolutionary perspective, the infraorder Tarsiiformes, whose only remaining family is that of the tarsier (Tarsiidae), branched off from the other haplorrhines. Since tarsiers also cannot make vitamin C, this implies the mutation had already occurred, placing it between these two marker points (63 to 58 million years ago). It has also been noted that the loss of the ability to synthesize ascorbate strikingly parallels the inability to break down uric acid, also a characteristic of primates. Uric acid and ascorbate are both strong reducing agents. This has led to the suggestion that, in higher primates, uric acid has taken over some of the functions of ascorbate.
==== Distribution ==== Atomoxetine is well-distributed and its volume of distribution is 0.85 to 1.02 L/kg in CYP2D6 extensive metabolizers and 2.25 L/kg in CYP2D6 poor metabolizers, with its distribution being equivalent to total body water. Atomoxetine and its metabolites show only limited partitioning into red blood cells. Atomoxetine crosses the blood–brain barrier, with this appearing to be due primarily to passive diffusion rather than active transport. The drug is not a substrate of P-glycoprotein. Animal studies have found that atomoxetine and/or its metabolites can cross the placenta, but fetal exposure was substantially lower than maternal exposure. Similarly, only a small amount of atomoxetine and/or metabolites were excreted in milk in animals. Atomoxetine shows high plasma protein binding of 98.7% and is primarily bound to albumin and to a lesser extent to α1-acid glycoprotein and immunoglobulin G (IgG). Atomoxetine's limitedly active metabolite N-desmethylatomoxetine is 99.1% bound to plasma proteins, whereas its active metabolite 4-hydroxyatomoxetine shows plasma protein binding of 66.6%, which is substantially less than that of atomoxetine itself.
== Chemistry == Sargramostim is a recombinant version of GM-CSF, which is a glycoprotein made of 127 amino acids; sargramostim is mixture of three versions of GM-CSF that have molecular weights of 19,500, 16,800 and 15,500 daltons. It is manufactured in yeast.
Chirality is important in context of ordered phases as well, for example the addition of a small amount of an optically active molecule to a nematic phase (a phase that has long range orientational order of molecules) transforms that phase to a chiral nematic phase (or cholesteric phase). Chirality in context of such phases in polymeric fluids has also been studied in this context.
Sources: en.wikipedia.org
mid body The centrally constricted region that forms across the central axis of a cell during cytokinesis, constricted by the closing of the contractile ring until the daughter cells are finally separated, but occasionally persisting as a tether between the two cells for as long as a complete cell cycle.
== Mitochondrial events controlling fuel selection == Fatty acids are preferentially oxidized because of the inactivation of PDH by fatty acid oxidation inhibiting glucose oxidation. This suggests that mitochondrial metabolism may control fuel selection. Cellular respiration is stimulated by fatty acids and this relates to an increase in the mitochondrial NADH to NAD+ ratio, suggesting that energy provision overtakes energy consumption. Switching from glucose to fatty acid oxidation leads to a bigger proportion of electrons being transported to complex 2 rather than complex 1 of the respiratory chain. This difference leads to a less efficient oxidative phosphorylation. By oxidizing fatty acids, mitochondria increase their respiration while increasing the production of ROS.
Moniz began his experiments with leucotomy just three months after the congress had reinforced the apparent cause-and-effect relationship between the Fulton and Jacobsen presentation and the Portuguese neurologist's resolve to operate on the frontal lobes. As the author of this account, Fulton, who has sometimes been claimed as the father of lobotomy, was later able to record that the technique had its true origination in his laboratory. Endorsing this version of events, in 1949, the Harvard neurologist Stanley Cobb remarked during his presidential address to the American Neurological Association that "seldom in the history of medicine has a laboratory observation been so quickly and dramatically translated into a therapeutic procedure". Fulton's report, penned ten years after the events described, is, however, without corroboration in the historical record and bears little resemblance to an earlier unpublished account he wrote of the congress. In this previous narrative, he mentioned an incidental, private exchange with Moniz, but it is likely that the official version of their public conversation he promulgated is without foundation. In fact, Moniz stated that he had conceived of the operation sometime before his journey to London in 1935, having told in confidence his junior colleague, the young neurosurgeon Pedro Almeida Lima, as early as 1933 of his psychosurgical idea.
==== Nanotech to disinfect water ==== Nanotechnology provides an alternative solution to clean germs in water, a problem that has been getting worse due to the population explosion, growing need for clean water and the emergence of additional pollutants. One of the alternatives offered is antimicrobial nanotechnology stated that several nanomaterials showed strong antimicrobial properties through diverse mechanisms, such as photocatalytic production of reactive oxygen species that damage cell components and viruses. There is also the case of the synthetically-fabricated nanometallic particles that produce antimicrobial action called oligodynamic disinfection, which can inactivate microorganisms at low concentrations. Commercial purification systems based on titanium oxide photocatalysis also currently exist and studies show that this technology can achieve complete inactivation of fecal coliforms in 15 minutes once activated by sunlight. There are four classes of nanomaterials that are employed for water treatment and these are dendrimers, zeolites, carbonaceous nanomaterials, and metals containing nanoparticles. The benefits of the reduction of the size of the metals (e.g. silver, copper, titanium, and cobalt) to the nanoscale such as contact efficiency, greater surface area, and better elution properties.
=== Development of databases === HMRBase: A manually curated database of hormones and their receptors. It is a compilation of sequence data after extensive manual literature search and from publicly available databases. HMRBase can be searched on the basis of a variety of data types. Owing to the high impact of endocrine research in the biomedical sciences, HMRBase could become a leading data portal for researchers. The salient features of HMRBase are hormone-receptor pair-related information, mapping of peptide stretches on the protein sequences of hormones and receptors, Pfam domain annotations, categorical browsing options, and online data submission. This database is integrated with DrugPedia so the public can contribute. BIAdb: A database for Benzylisoquinoline Alkaloids. The Benzylisoquinoline Alkaloid Database serves to gather information related to the BIA's. Many BIA's show therapeutic properties and can be considered as potent drug candidates. This database will also serve researchers working in the field of synthetic biology, as developing medicinally important alkaloids using synthetic process is one of the important challenges. This database is also integrated with DrugPedia so the public can contribute. Antigen DB: This database contain more than 500 antigens collected from literature and other immunological resources. These antigens come from 44 pathogenic species. In Antigen DB, a database entry contains information regarding the sequence, structure, origin, etc.
Sources: en.wikipedia.org
In some part of South China, soups (Chinese: 湯/汤 tāng) are served between the cold dishes and the main dishes. In other parts of China, soups are served between the main dish and staple foods, before desserts or fruit salad. There are many traditional Chinese soups, such as wonton soup, herbal chicken soup, hot and sour soup, winter melon soup, and so on.
== Further reading == Biochemistry textbook reference, from the NCBI bookshelf – Jeremy M. Berg; John L. Tymoczko; Lubert Stryer (eds.). "18.4. A Proton Gradient Powers the Synthesis of ATP". Biochemistry (5th ed.). W. H. Freeman. Archived from the original on August 3, 2007. A set of experiments aiming to test some tenets of the chemiosmotic theory – Ogawa S, Lee TM (August 1984). "The relation between the internal phosphorylation potential and the proton motive force in mitochondria during ATP synthesis and hydrolysis". The Journal of Biological Chemistry. 259 (16): 10004–10011. doi:10.1016/S0021-9258(18)90918-X. PMID 6469951.
Union of Sovereign States: The treaty proposed to set up a Union of Sovereign and Equal States based on democracy and rule-of-law as successor to the Union of Soviet Socialist Republics. This new polity was envisioned as a voluntary association of sovereign republics with a common federal government. A member joins the Union either directly or as a part of other states, and relations between members when one of them is a part of another are regulated by treaties between them. Presidential Council: The treaty proposed the creation of a Presidential Council that would consist of the leaders of the republics and the president of the Union. This council would be responsible for making important decisions and coordinating policies at federal level. A Union Constitutional Court would be created to settle disputes over questions of the exercise of the powers of Union organs. The legislative power of the Union would be exercised by the USSR Supreme Soviet, which consists of two chambers: the Soviet of the Republics, elected by the population of the whole country, and the Soviet of the Union. Decentralization of Power: The treaty aimed to decentralize political power by granting greater autonomy to the Republics giving them general guarantees about the right to control their own resources and legislate including the right to freely secede from the Union. Division of Powers: The central government would handle issues of defence, foreign affairs, financial system, energy resources and overall coordination along with issuing its currency.
== Chemistry == KNX-100 is a synthetic small molecule and peptide fragment of the oxytocin system. Its chemical structure has been disclosed by its developers in a patent. The chemical synthesis of KNX-100 has been described. The small-molecule oxytocin receptor agonists LIT-001 and LIT-002 are derivatives of KNX-100. The more-compact small-molecule oxytocin receptor agonists WJ0679 and CA7 are also analogues of KNX-100.
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.
It binds REV-ERB alpha and REV-ERB beta and changes the expression of genes tied to metabolism and circadian rhythm. These changes can affect mitochondria and energy use in animal models. The exact chain from receptor binding to physiological outcome is still being mapped.
No reliable human trials show that SR9009 improves athletic performance. Some rodent studies report endurance changes, but these results are not proof of human benefit. Its use in sport is prohibited, and quality and safety data are lacking.
Laboratories commonly use liquid chromatography coupled with mass spectrometry to detect SR9009. The method can identify the compound and estimate concentration in a sample. Detection limits depend on the matrix and instrument.