
| CAS Number | 54-62-6 |
|---|---|
| Molecular Formula | C19H20N8O5 |
| Molecular Weight | 440.4 |
| InChI Key | TVZGACDUOSZQKY-LBPRGKRZSA-N |
| LogP | -2 |
| Synonyms |
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Applications:
Uv-Vis Spectrum of Aminopterin
January 13, 2026
If you are looking for optimized HPLC method to analyze Aminopterin check our HPLC Applications library
For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. The spectra presented here are measured with an acidic mobile phase that has a pH of 3 or lower.
HPLC Method for Separation of Folic Acid, Methotrexate and Aminopterin on Primesep 100 Column
June 12, 2023
HPLC Method for Separation of Methotrexate, Aminopterin, Folic Acid on Primesep 100 by SIELC Technologies
Separation type: Liquid Chromatography Mixed-mode
Aminopterin and folic acid are chemically related compounds that play significant roles in biochemistry and medicine.
Methotrexate, Aminopterin, and Folic Acid are chemically related compounds that have important roles in biochemistry and medicine.
- Methotrexate: This is a chemotherapy agent and immune system suppressant. Methotrexate is an antimetabolite and antifolate drug, meaning it inhibits the metabolism of folic acid. It does this by inhibiting the enzyme dihydrofolate reductase (DHFR), preventing the formation of active folate and thus interfering with DNA and RNA synthesis. It is used to treat certain types of cancer and autoimmune diseases like rheumatoid arthritis and psoriasis.
- Aminopterin: This is also an antifolate, and it works in a similar way to methotrexate, by inhibiting the enzyme DHFR. Aminopterin was one of the first antifolates to be used in cancer chemotherapy. However, it has largely been replaced by methotrexate, which is less toxic and more effective.
- Folic Acid: Also known as folate or vitamin B9, this is an essential nutrient that the body needs for many functions. It’s critical for the synthesis, repair, and functioning of DNA, as well as for cell division and growth. A deficiency of folic acid can lead to anemia and other health problems.
The antifolate drugs methotrexate and aminopterin are designed to interfere with the actions of folic acid, making them effective in slowing down the growth of rapidly dividing cells, such as cancer cells. However, this can also affect normal, healthy cells, leading to side effects.
Aminopterin, methotrexate and folic acid can be retained, separated, and analyzed using a reverse-phase Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended column. The mobile phase for this method consists of water, acetonitrile (MeCN), and ammonium formate, which serves as a buffer. This analytical method can be monitored using UV detection at 290 nm, an Evaporative Light Scattering Detector (ELSD), or any other evaporative detection method such as Charged Aerosol Detection (CAD) or Electrospray Ionization Mass Spectrometry (ESI-MS)
LOD was determined for this combination of instrument, method, and analyte, and it can vary from one laboratory to another even when the same general type of analysis is being performed.
High Performance Liquid Chromatography (HPLC) Method for Analysis of Methotrexate, Aminopterin, Folic Acid
Condition
| Column | Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended |
| Mobile Phase | Gradient MeCN -10-70%, 10 min |
| Buffer | Ammonium formate pH 3.0 – 50 mM |
| Flow Rate | 1.0 ml/min |
| Detection | UV 290 nm |
| Peak Retention Time | 5.08 min, 8.32 min |
| Sample concentration | 0.02 mg/ml |
| Injection volume | 5 µl |
| Sample diluent | H2O+NaOH |
| LOD | 0.04 ppm |
Description
| Class of Compounds | Drug, Aminopterin, Antifolates, Acid |
| Analyzing Compounds | Methotrexate, Aminopterin, Folic Acid |
Application Column
Primesep 100
Column Diameter: 4.6 mm
Column Length: 150 mm
Particle Size: 5 µm
Pore Size: 100 A
Column options: dual ended
Folic Acid
Methotrexate
HPLC Method for Separation of Biopterin, Rhamnopterin, Neopterin, Folic Acid and Aminopterin on Primesep 100 Column
June 8, 2023
HPLC Method for Analysis of Biopterin, Rhamnopterin, Neopterin, Folic Acid, Aminopterin on Primesep 100 by SIELC Technologies
High Performance Liquid Chromatography (HPLC) Method for Analysis of Biopterin, Rhamnopterin, Neopterin, Folic Acid, Aminopterin.
Biopterin is a coenzyme with the chemical formula C9H11N5O3. It is involved in the biosynthesis of several important bioactive substances, including neurotransmitters like serotonin and dopamine. It’s also integral to the creation of nitric oxide, a potent vasodilator. It plays a critical role in the body as a cofactor in the synthesis of several important neurotransmitters, including serotonin, melatonin, dopamine, norepinephrine, and epinephrine. These neurotransmitters are crucial for many physiological functions, including mood regulation, sleep, and response to stress. Deficiency in biopterin metabolism can lead to various disorders, such as neurodegeneration due to BH4 deficiency, a group of rare inherited neuro-metabolic disorders. This is why understanding and potentially modulating biopterin and its derivatives could be significant for certain therapeutic approaches. You can find detailed UV spectra of Biopterin and information about its various lambda maxima by visiting the following link.
Rhamnopterin is a derivative of L-biopterin, D-biopterin, and the oxidized form of tetrahydro-L-biopterin (BH4) with the formula C10H13N5O4. It has exhibited significant properties in dietary studies. When administered in a 0.5% concentration alongside the carcinogen 4-dimethylaminoazobenzene, it can reduce the incidence of liver tumors induced by this carcinogen in rats. In addition to these therapeutic applications, rhamnopterin has also been utilized as an internal standard for quantifying biopterin and neopterin levels in rat plasma, as demonstrated in LC-MS-based studies. You can find detailed UV spectra of Rhamnopterin and information about its various lambda maxima by visiting the following link.
Neopterin is a catabolic product of guanosine triphosphate (GTP) with the chemical formula C9H11N5O4. It is a molecule involved in energy transfer. It’s often used as a marker for immune system activation, particularly in response to certain diseases, including viral infections, autoimmune diseases, and cancer. It is indicative of a pro-inflammatory immune status, therefore it typically serves as a marker of the activation of the cellular immune system. You can find detailed UV spectra of Neopterin and information about its various lambda maxima by visiting the following link.
Folic acid, also known as vitamin B9, is an essential nutrient that our bodies need to function correctly. It plays a vital role in many bodily functions, including DNA synthesis and repair, cell division and growth, and the production of red blood cells. Humans cannot synthesize folic acid and, therefore, must obtain it through their diet or via supplementation. It has the chemical formula C19H19N7O6. You can find detailed UV spectra of Folic Acid and information about its various lambda maxima by visiting the following link.
Aminopterin is a chemical compound with the chemical formula C19H20N8O5. It belongs to the class of drugs known as antifolates. It’s a derivative of folic acid (vitamin B9) and works by inhibiting an enzyme called dihydrofolate reductase (DHFR). This enzyme plays a crucial role in the synthesis of nucleotides, the building blocks of DNA and RNA. By inhibiting this enzyme, aminopterin interferes with cell growth and division. Aminopterin was one of the first antifolates to be used in cancer chemotherapy, particularly in the treatment of childhood leukemia. However, it has largely been replaced by methotrexate, a similar but less toxic compound. Methotrexate is still widely used in the treatment of various cancers and autoimmune diseases. Despite its historical use in cancer treatment, aminopterin is extremely toxic and can cause severe side effects, including damage to the bone marrow, gastrointestinal tract, and skin. As a result, it is not typically used in human medicine today. In addition to its role in chemotherapy, aminopterin has also been used in research to create what are known as “conditionally immortal” cell lines. It’s important to note that the use of aminopterin should always be overseen by professionals due to its high toxicity. You can find detailed UV spectra of Aminopterin and information about its various lambda maxima by visiting the following link.
[compoumds] can be retained, separated and analyzed using a reverse-phase Primesep 100 column. The mobile phase for this method consists of water, acetonitrile (MeCN), and ammonium formate, which serves as a buffer. This analytical method can be monitored using UV detection at 275 nm, an Evaporative Light Scattering Detector (ELSD), or any other evaporative detection method such as Charged Aerosol Detection (CAD) or Electrospray Ionization Mass Spectrometry (ESI-MS)
LOD was determined for this combination of instrument, method, and analyte, and it can vary from one laboratory to another even when the same general type of analysis is being performed.
Condition
| Column | Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended |
| Mobile Phase | Gradient MeCN -5-60%, 10 min |
| Buffer | Ammonium formate pH 3.0 – 50 mM |
| Flow Rate | 1.0 ml/min |
| Detection | UV 275 nm |
| Peak Retention Time | 2.21, 3.28, 3.81, 6.85, 11.21 min |
| Sample concentration | 0.02 mg/ml |
| Injection volume | 5 µl |
| Sample diluent | H2O + NaOH |
| LOD | 10 ppb |
Description
| Class of Compounds | Pteridines |
| Analyzing Compounds | Biopterin, Rhamnopterin, Neopterin, Folic Acid, Aminopterin |
Application Column
Primesep 100
Column Diameter: 4.6 mm
Column Length: 150 mm
Particle Size: 5 µm
Pore Size: 100 A
Column options: dual ended
Biopterin
Folic Acid
Neopterin
Rhamnopterin
HPLC Method for Separation of Folic Acid and Aminopterin on Primesep 100 Column
June 7, 2023
HPLC Method for Separation of Aminopterin, Folic Acid on Primesep 100 by SIELC Technologies

High Performance Liquid Chromatography (HPLC) Method for Analysis of Aminopterin, Folic Acid.
Aminopterin and folic acid are chemically related compounds that play significant roles in biochemistry and medicine.
Folic acid, also known as vitamin B9, is an essential nutrient that our bodies need to function correctly. It plays a vital role in many bodily functions, including DNA synthesis and repair, cell division and growth, and the production of red blood cells. Humans cannot synthesize folic acid and, therefore, must obtain it through their diet or via supplementation. It has the chemical formula C19H19N7O6. You can find detailed UV spectra of Folic Acid and information about its various lambda maxima by visiting the following link.
Aminopterin is a derivative of folic acid with the chemical formula C19H20N8O5. It was one of the first antifolate drugs, a class of medication that inhibits the enzyme dihydrofolate reductase (DHFR). This enzyme is critical for converting folic acid into its active form, tetrahydrofolate, which is used in the synthesis of nucleotides for DNA and RNA.
By inhibiting DHFR, aminopterin interferes with the synthesis of DNA and RNA, blocking cell replication. This property made it useful as a cancer drug, as it can stop the rapid cell division characteristic of cancerous cells. However, aminopterin is highly toxic and is no longer used clinically. It has been largely replaced by less toxic and more effective antifolate drugs, such as methotrexate.
You can find detailed UV spectra of Aminopterin and information about its various lambda maxima by visiting the following link.
It’s important to note that while aminopterin and folic acid are chemically related, their biological effects are very different due to their interactions with the enzyme DHFR. Always consult with a healthcare provider for accurate and up-to-date information.
Aminopterin, Folic Acid can be retained, separated, and analyzed using a reverse-phase Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended column. The mobile phase for this method consists of water, acetonitrile (MeCN), and ammonium formate, which serves as a buffer. This analytical method can be monitored using UV detection at 290 nm, an Evaporative Light Scattering Detector (ELSD), or any other evaporative detection method such as Charged Aerosol Detection (CAD) or Electrospray Ionization Mass Spectrometry (ESI-MS)
LOD was determined for this combination of instrument, method, and analyte, and it can vary from one laboratory to another even when the same general type of analysis is being performed.
Condition
| Column | Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended |
| Mobile Phase | Gradient MeCN -10-60%, 10 min |
| Buffer | Ammonium formate pH 3.0 – 50 mM |
| Flow Rate | 1.0 ml/min |
| Detection | UV 290 nm |
| Peak Retention Time | 5.08 min, 8.32 min |
| Sample concentration | 0.02 mg/ml |
| Injection volume | 5 µl |
| Sample diluent | H2O+NaOH |
| LOD | 0.04 ppm |
Description
| Class of Compounds | Drug, Aminopterin, Antifolates, Acid |
| Analyzing Compounds | Aminopterin, Folic Acid |
Application Column
Primesep 100
Column Diameter: 4.6 mm
Column Length: 150 mm
Particle Size: 5 µm
Pore Size: 100 A
Column options: dual ended
Folic Acid
HPLC Method for Analysis of Aminopterin on Primesep 100 Column
June 7, 2023
HPLC Method for Analysis of Aminopterin on Primesep 100 by SIELC Technologies

High Performance Liquid Chromatography (HPLC) Method for Analysis of Aminopterin.
Aminopterin is a chemical compound with the chemical formula C19H20N8O5. It belongs to the class of drugs known as antifolates. It’s a derivative of folic acid (vitamin B9) and works by inhibiting an enzyme called dihydrofolate reductase (DHFR). This enzyme plays a crucial role in the synthesis of nucleotides, the building blocks of DNA and RNA. By inhibiting this enzyme, aminopterin interferes with cell growth and division.
Aminopterin was one of the first antifolates to be used in cancer chemotherapy, particularly in the treatment of childhood leukemia. However, it has largely been replaced by methotrexate, a similar but less toxic compound. Methotrexate is still widely used in the treatment of various cancers and autoimmune diseases.
Despite its historical use in cancer treatment, aminopterin is extremely toxic and can cause severe side effects, including damage to the bone marrow, gastrointestinal tract, and skin. As a result, it is not typically used in human medicine today.
In addition to its role in chemotherapy, aminopterin has also been used in research to create what are known as “conditionally immortal” cell lines. It’s important to note that the use of aminopterin should always be overseen by professionals due to its high toxicity.
You can find detailed UV spectra of Aminopterin and information about its various lambda maxima by visiting the following link.
Aminopterin retained and analyzed using a reverse-phase Primesep 100 column. The mobile phase for this method consists of water, acetonitrile (MeCN), and ammonium formate, which serves as a buffer. This analytical method can be monitored using UV detection at 290 nm, an Evaporative Light Scattering Detector (ELSD), or any other evaporative detection method such as Charged Aerosol Detection (CAD) or Electrospray Ionization Mass Spectrometry (ESI-MS)
LOD was determined for this combination of instrument, method, and analyte, and it can vary from one laboratory to another even when the same general type of analysis is being performed.
Condition
| Column | Primesep 100, 4.6 x 150 mm, 5 µm, 100 A, dual ended |
| Mobile Phase | MeCN/H2O -50/50% |
| Buffer | Ammonium formate pH 3.0 – 20 mM |
| Flow Rate | 1.0 ml/min |
| Detection | UV 290 nm |
| Peak Retention Time | 5.08 min |
| Sample concentration | 0.02 mg/ml |
| Injection volume | 5 µl |
| Sample diluent | H2O + NaOH |
| LOD | 0.04 ppm |
Description
| Class of Compounds | Drug, Aminopterin, Antifolates |
| Analyzing Compounds | Aminopterin |
Application Column
Primesep 100
Column Diameter: 4.6 mm
Column Length: 150 mm
Particle Size: 5 µm
Pore Size: 100 A
Column options: dual ended


