The short version of aspartimide fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-01-19. Anything still debated is marked as such rather than presented as settled.
Storage and handling follow conventional peptide practice. Lyophilized epitalon is typically kept refrigerated or frozen, protected from moisture and light, and allowed to equilibrate to room temperature before opening to avoid condensation. Once dissolved, aqueous solutions are usually stored cold and used within a short period, since dilute peptide solutions can support microbial growth and may slowly degrade. The absence of cysteine and methionine reduces, but does not eliminate, oxidation concerns during long-term storage.
Regulatory status varies by country and is not harmonized. Epitalon is not an approved drug in major Western jurisdictions. In some countries it is sold as a research chemical, and in others it has appeared in products marketed for other categories. This inconsistent status means that purity, labeling accuracy, and documentation differ widely between suppliers, and verification of identity and purity through independent analysis is the usual way buyers assess a given lot.
Epitalon appears in the literature primarily through a small number of research groups, most of them associated with the St. Petersburg Institute of Bioregulation and Gerontology. Publications describe cell culture experiments, animal studies, and a limited number of small human studies. Independent replication outside this network is sparse. As a result, reviews of the topic usually separate descriptive reports of observed effects from the question of whether those effects generalize, and they note the difficulty of comparing studies that use different preparations and endpoints.
The molecule is a short, linear, hydrophilic peptide that dissolves readily in water or aqueous buffer. Its principal chemical liabilities are hydrolytic rather than oxidative, since it contains no cysteine, methionine, or tryptophan residues. The aspartate–glycine step is a recognised site for aspartimide formation under mildly acidic or basic conditions, generating isoaspartate and succinimide-related products over time. Desiccated lyophilised powder held at −20 °C is comparatively stable, whereas dilute solutions degrade faster and are best frozen as single-use aliquots rather than thawed repeatedly.
No pharmacopoeial monograph exists for this peptide, so quality rests on the supplier's internal specifications and on whatever independent testing a purchaser arranges. Certificates of analysis differ widely in which tests they report and in the limits applied. The counter-ion introduced during purification, commonly acetate or trifluoroacetate, changes the net peptide content of a given mass of powder, so two samples of equal weight may not contain equal amounts of the active sequence. Third-party laboratories can verify purity, identity, residual solvents, and counter-ion content for a fee, which makes documentation more informative than labelling.
| Property | Value | Notes |
|---|---|---|
| Purity assessment | RP-HPLC | Reported as percent area, often ≥95% |
| Identity confirmation | Mass spectrometry | Observed mass compared with ~390 Da |
| Typical storage temperature | -20 °C or below | Lyophilized powder, desiccated |
| Reconstitution solvent | Sterile water or buffer | Acidic residues aid dissolution |
| Common synonyms | AEDG; epithalon | Spelling varies in literature |
Short peptides such as AEDG are normally supplied as a freeze-dried solid and are kept dry, cold, and shielded from light. Holding at minus twenty degrees Celsius is common for the long term, while a refrigerator suffices for brief periods before use. The material takes up moisture to some degree, so containers should stay sealed and be allowed to reach room temperature before opening, which limits condensation on the contents. Repeated warming and cooling of a single container is discouraged because it admits water and can lower the amount of intact peptide.
Dissolution is usually performed in water or a suitable aqueous buffer, and the resulting liquid is divided into single-use portions before freezing. Freeze-thaw cycling is a recognised source of loss for short peptides, since each cycle can encourage aggregation or adsorption onto container walls. Working solutions are generally kept cold and used within a short window, although published stability data specific to epitalon are thin. Containers should be marked with concentration and date, and solutions examined for cloudiness before use.
== Further reading == Mortison, JD; Sherman, DH (2010). "Frontiers and opportunities in chemoenzymatic synthesis". J Org Chem. 75 (21): 7041–51. doi:10.1021/jo101124n. PMC 2966535. PMID 20882949. Kim, Jinhyun; Lee, Sahng Ha; Tieves, Florian; Paul, Caroline E.; Hollmann, Frank; Park, Chan Beum (5 July 2019). "Nicotinamide adenine dinucleotide as a photocatalyst". Science Advances. 5 (7): eaax0501. doi:10.1126/sciadv.aax0501.
=== Clinical significance === Interstitial deletions of chromosome 3 are rare, and only a few patients with a microdeletion of 3p21.31 have been reported to date. Characteristic clinical features found in patients with a microdeletion of 3p21.31 include developmental delay and distinctive facial features (including arched eyebrows, hypertelorism, epicanthus, and micrognathia). In the gene region, NCBI SNP identified 1,326 SNPS on the reverse minus strand of C3orf62. In the coding region, NCBI SNP identified 147 common SNPs.
The presence of autoantibodies against citrullinated proteins in rheumatoid arthritis patients was first described in the mid-1970s when the biochemical basis of antibody reactivity against keratin and filaggrin was investigated. Subsequent studies demonstrated that autoantibodies from RA patients react with a series of different citrullinated antigens, including fibrinogen, deiminated Epstein–Barr virus nuclear antigen 1 and vimentin, which is a member of the intermediate filament family of proteins. Several assays for detecting ACPAs were developed in the following years, employing mutated citrullinated Vimentin (MCV-assay), filaggrin-derived peptides (CCP-assay) and viral citrullinated peptides (VCP-assay). A 2006 clinical study showed that anti viral citrullinated peptide (VCP) antibodies of the IgG and IgA isotypes represent a discriminating specific marker of rheumatoid arthritis from other chronic arthritides and disease controls, suggesting an independent production of each isotype. In 2010, ACPA testing has become substantial part of The 2010 ACR-EULAR classification criteria for rheumatoid arthritis.
Uranium is pyrophoric when finely divided. It will corrode under the influence of air and water producing insoluble uranium(IV) and soluble uranium(VI) salts. Soluble uranium salts are toxic. Uranium slowly accumulates in several organs, such as the liver, spleen, and kidneys. The World Health Organization has established a daily "tolerated intake" of soluble uranium salts for the general public of 0.5 micrograms per kilogram (3.5×10−6 gr/lb) body weight, or 35 micrograms (0.00054 gr) for a 70 kilograms (150 lb) adult. Epidemiological studies and toxicological tests on laboratory animals point to it as being immunotoxic, teratogenic, neurotoxic, with carcinogenic and leukemogenic potential. A 2005 report by epidemiologists concluded: "the human epidemiological evidence is consistent with increased risk of birth defects in offspring of persons exposed to DU." Early studies of depleted uranium aerosol exposure assumed that uranium combustion product particles would quickly settle out of the air and thus could not affect populations more than a few kilometers from target areas, and that such particles, if inhaled, would remain undissolved in the lung for a great length of time and thus could be detected in urine. Violently burning uranium droplets produce a gaseous vapor comprising about half of the uranium in their original mass. Uranyl ion contamination in uranium oxides has been detected in the residue of DU munitions fires. Approximately 90 micrograms (0.0014 gr) of natural uranium, on average, exist in the human body as a result of normal intake of water, food and air.
Sources: en.wikipedia.org
Cambrex Corporation is a contract manufacturing organization in the pharmaceutical industry. Cambrex has manufacturing facilities in the US (Agawam, MA; Charles City, IA; Durham, NC; High Point, NC; Longmont, CO; Waltham, MA) and Europe (Edinburgh, UK; Karlskoga, Sweden, Milan, Italy, and R&D centers in Tallinn, Estonia, Wiesbaden, Germany). The headquarters are located in East Rutherford, NJ.
== Medical use == Evidence for benefit of PRP is mixed, with some evidence for use in certain conditions and against use in other conditions. It has been investigated for chronic tendinitis, osteoarthritis, in oral surgery, and in plastic surgery.
Ribosomal DNA (rDNA) is more vulnerable to DNA damage than DNA elsewhere in the genome such that rDNA instability can lead to cellular senescence, and thus to SASP The high-mobility group proteins (HMGA) can induce senescence and SASP in a p53-dependent manner. Activation of the retrotransposon LINE1 can result in cytosolic DNA that activates the cGAS–STING cytosolic DNA sensing pathway upregulating SASP by induction of interferon type I. cGAS is essential for induction of cellular senescence by DNA damage. SASP secretion can also be initiated by the microRNAs miR-146 a/b. Senescent cells release mitochondrial double-stranded RNA (mt-dsRNA) into the cytosol driving the SASP via RIGI/MDA5/MAVS/MFN1. Moreover, senescent cells are hypersensitive to mt-dsRNA-driven inflammation due to reduced levels of PNPT1 and ADAR1.
Sources: en.wikipedia.org
=== q-RASAR === QSAR has been merged with the similarity-based read-across technique to develop a new field of q-RASAR. The DTC Laboratory at Jadavpur University has developed this hybrid method and the details are available at their laboratory page. Recently, the q-RASAR framework has been improved by its integration with the ARKA descriptors in QSAR.
=== 3 February === Abdallah Hussein, a senior RSF commander was killed by an SAF airstrike in al-Kamelin in Gezira State. The SAF claimed to have broke the siege of its Corps of Engineers garrison in the Al 'Aylafun area, and retook the al-Asaylat, Um Daw Ban, and Al 'Aylafun areas of the East Nile locality. The SAF said it plans to continue advances to recapture the Soba Bridge. According to the state health minister of South Kordofan, the SPLM-N (al-Hilu) killed 44 people after shelling the main market, residential neighborhoods, and temporary shelters in schools in Kadugli. Twenty-five people were killed in an SAF airstrike in Nyala.
=== Adults === The widely used rule calculating normal maximum ESR values in adults (98% confidence limit) is given by a formula devised in 1983 from a study of ≈1000 individuals over the age of 20: The normal values of ESR in men is age (in years) divided by 2; for women, the normal value is age (in years) plus 10, divided by 2.
Sources: en.wikipedia.org
Identity is normally confirmed by mass spectrometry, which checks the measured mass against the expected value near 390 daltons. Reverse-phase high-performance liquid chromatography is used alongside it to assess purity. Amino acid analysis can provide additional composition data.
The powder is generally kept refrigerated or frozen, protected from light and moisture. Vials should reach room temperature before opening to prevent condensation. Reconstituted solutions are usually stored cold and used within a limited window because dilute solutions can degrade or support microbial growth.
Epitalon is not an approved drug in major Western regulatory jurisdictions. Its legal status differs between countries, and it is often distributed as a research chemical. This means product documentation and purity vary considerably between suppliers.
Mass spectrometry provides the identity check, because the observed mass is compared with the theoretical mass of the AEDG sequence. Chromatography separates and quantifies impurities but does not by itself prove which peptide is present. The two techniques are normally used together.