Drug Impurity Standards

Carbamazepine (Standard) is the analytical standard of Carbamazepine. This product is intended for research and analytical applications. Carbamazepine is an orally active pressure-sensitive sodium ion channel blocker with an IC₅₀ of 131 μM. Carbamazepine blocks voltage gated Na⁺, Ca²⁺, and K⁺ channels, and is also a HDAC inhibitor (IC₅₀: 2 μM). Carbamazepine is an anticonvulsant and can be used for research of epilepsy and neuropathic pain.

L-Cystine (Standard) is the analytical standard of L-Cystine. This product is intended for research and analytical applications. L-Cystine, the extracellular form of L-Cysteine (HY-Y0337), is a nutritionally dispensable semiessential sulfur-containing amino acid, occurring in proteins of plants and animals. L-Cystine induces Nrf2 protein elevation in a Keap1 (HY-P75897)-dependent manner and activates Nrf2 transcription factor. L-cystine can elicit cytoprotection by reducing ROS generation and protecting against oxidant- or doxorubicin-induced apoptosis. The reduced reabsorption of L-Cystine in renal tubules and its poor solubility in urine are the important causes of cystine precipitation and cystine crystal formation eventually leading to kidney stones. L-Cystine combined with L-theanine (HY-15121) enhances the production of antigen-specific IgG by increasing glutathione (GSH) levels and T helper 2 (Th2) mediated responses in mice. L-Cystine is promising for research of cystinuria and cystinosis

7-Dehydrocholesterol (Standard) is the analytical standard of 7-Dehydrocholesterol. This product is intended for research and analytical applications.7-Dehydrocholesterol is biosynthetic precursor of cholesterol and vitamin D3.

Medroxyprogesterone acetate (Standard) is the analytical standard of Medroxyprogesterone acetate. This product is intended for research and analytical applications. Medroxyprogesterone acetate is a widely used synthetic steroid by its interaction with progesterone, androgen and glucocorticoid receptors.

Diclofenac (Standard) is the analytical standard of Diclofenac. This product is intended for research and analytical applications. Diclofenac is a potent and nonselective anti-inflammatory agent, acts as a COX inhibitor, with IC50s of 4 and 1.3 nM for human COX-1 and COX-2 in CHO cells, and 5.1 and 0.84 μM for ovine COX-1 and COX-2, respectively. Diclofenac induces apoptosis of neural stem cells (NSCs) via the activation of the caspase cascade.

L-Carnosine (Standard) is the analytical standard of L-Carnosine. This product is intended for research and analytical applications. L-Carnosine is a dipeptide of the amino acids beta-alanine and histidine and has the potential to suppress many of the biochemical changes that accompany aging. In Vitro: L-Carnosine is a dipeptide of the amino acids beta-alanine and histidine and has the potential to suppress many of the biochemical changes that accompany aging.
L-Carnosine also exhibits some antioxidant effects. The antioxidant mechanism of L-Carnosine is attributed to its chelating effect against metal ions, superoxide dismutase (SOD)-like activity, and ROS and free radicals scavenging ability.

α-Vitamin E (Standard) is the analytical standard of α-Vitamin E. This product is intended for research and analytical applications. α-Vitamin E ((+)-α-Tocopherol), a naturally occurring vitamin E form, is a potent antioxidant.

L-Alanine (Standard) is the analytical standard of L-Alanine. This product is intended for research and analytical applications. L-Alanine is a non-essential amino acid, involved in sugar and acid metabolism, increases immunity, and provides energy for muscle tissue, brain, and central nervous system. In Vitro: The viability of both hiPSCs, 201B7 cells and ehiPSCs decrease with an increase in L-Alanine concentration, and reach 7.5±1.3% and 3.7±0.7% respectively at 1.2 M of L-Alanine. On the other hand, no decrease in the viability of hFBs and hSkMCs are observed. Although the viability of iCMs slightly decreases along with the increase of the L-Alanine concentration, viability of iCMs at 1.2 M concentration of L-Alanine, 49.4±6.9%, is significantly higher than that of undifferentiated iPSCs, 201B7 cells and ehiPSCs (p< 0.01). The viability of hiPSCs, 201B7 cells and ehiPSCs, drastically decrease even after 2 or 4 h treatment. In contrast, the viability of hFBs fails to decrease at 1, 2, and 4 h and shows a small decrease at 24 h treatment. The viability of 201B7 cells in suspension culture decreases to 11.8±6.0% following treatment with 1.2 M L-Alanine for 2 h, whereas that of hFBs is 72.9±14.2%.

Guanine (Standard) is the analytical standard of Guanine (HY-Y1055). This product is intended for research and analytical applications. Guanine is one of the fundamental components of nucleic acids (DNA and RNA). Guanine is a purine derivative, consisting of a fused pyrimidine-imidazole ring system with conjugated double bonds. Guanine has the potential to serve as a large-capacity N pool. Guanine has cytotoxic, antinociceptive and neuroprotective effects.

Urea (Standard) is the analytical standard of Urea. This product is intended for research and analytical applications. Urea is a powerful protein denaturant via both direct and indirect mechanisms. A potent emollient and keratolytic agent. Used as a diuretic agent. Blood urea nitrogen (BUN) has been utilized to evaluate renal function. Widely used in fertilizers as a source of nitrogen and is an important raw material for the chemical industry.

Isoniazid (Standard) is the analytical standard of Isoniazid. This product is intended for research and analytical applications. Isoniazid (INH) is a proagent and must be activated by a bacterial catalase-peroxidase enzyme KatG. Isoniazid is bactericidal to rapidly dividing mycobacteria and has anti-tuberculostatic activity.

Calcitriol (Standard) is the analytical standard of Calcitriol. This product is intended for research and analytical applications. Calcitriol is the most active metabolite of vitamin D and also a vitamin D receptor (VDR) agonist.

L-5-Hydroxytryptophan (Standard) is the analytical standard of L-5-Hydroxytryptophan. This product is intended for research and analytical applications. L-5-Hydroxytryptophan (L-5-HTP), a naturally occurring amino acid and a dietary supplement for use as an antidepressant, appetite suppressant, and sleep aid, is the immediate precursor of the neurotransmitter serotonin and a reserpine antagonist. L-5-Hydroxytryptophan (L-5-HTP) is used to treat fibromyalgia, myoclonus, migraine, and cerebellar ataxia.

(S)-2-Aminohexanedioic acid (Standard) is the analytical standard of (S)-2-Aminohexanedioic acid (HY-W013665). This product is intended for research and analytical applications. (S)-2-Aminohexanedioic acid is a biochemical reagent that can be used as a biological material or organic compound for life science related research.

Adenine (Standard) is the analytical standard of Adenine. This product is intended for research and analytical applications. Adenine (6-Aminopurine), a purine, is one of the four nucleobases in the nucleic acid of DNA. Adenine acts as a chemical component of DNA and RNA. Adenine also plays an important role in biochemistry involved in cellular respiration, the form of both ATP and the cofactors (NAD and FAD), and protein synthesis.

Everolimus (Standard) is the analytical standard of Everolimus. This product is intended for research and analytical applications. Everolimus (RAD001) is a Rapamycin (HY-10219) derivative and a potent, selective and orally active mTOR1 inhibitor. Everolimus binds to FKBP-12 to generate an immunosuppressive complex. Everolimus inhibits tumor cells proliferation and induces cell apoptosis and autophagy. Everolimus has potent immunosuppressive and anticancer activities.

Vanillic acid (Standard) is the analytical standard of Vanillic acid. This product is intended for research and analytical applications. Vanillic acid is a flavoring agent found in edible plants and fruits, also found in Angelica sinensis. Vanillic acid inhibits NF-κB activation. Anti-inflammatory, antibacterial, and chemopreventive effects.

Picaridin (Standard) is the analytical standard of Picaridin. This product is intended for research and analytical applications. Picaridin (Lcaridin) is a broad spectrum arthropod repellent. The repellent and deterrent activities of Picaridin involve olfactory sensing in mosquitoes, and ticks, via their interactions with odorant receptor proteins.

Isavuconazole (Standard) is the analytical standard of Isavuconazole. This product is intended for research and analytical applications. Isavuconazole (BAL-4815) is a triazole proagent with antifungal activity against yeasts, molds, and dimorphic fungi. Isavuconazole inhibits ergosterol biosynthesis and results in the disruption of fungal membrane structure and function. Isavuconazole is a moderate inhibitor of CYP3A4.

trans-Cinnamic acid (Standard) is the analytical standard of trans-Cinnamic acid. This product is intended for research and analytical applications. trans-Cinnamic acid is a natural antimicrobial, with minimal inhibitory concentration (MIC) of 250 μg/mL against fish pathogen A. sobria, SY-AS1.