| Size | Price | Stock | Qty |
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| 25mg |
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| 50mg |
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| 100mg |
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| 250mg |
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| Other Sizes |
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Nifekalant hydrochloride (MS-551) is an IKr potassium channel blocker belonging to the class III antiarrhythmic agent with an IC50 of 10 µM. It can be used for refractory ventricular tachyarrhythmias.
| ln Vitro |
Nifekalant has a Ki value of 27 mM for cardiac M2 receptor interaction and 74 mM for peripheral M3 receptor interaction. With an IC50 value of 7.9 mM, nifekalant dose-dependently inhibits HERG channels, however in the Xenopus oocyte expression system, it has no effect on minK currents. In a frequency-dependent way, nifekalant mostly inhibits HERG channels while they are open. Pure K+ channel blockers like Nifekalant do not influence cardiac conduction and do not have the detrimental inotropic effects of amiodarone due to their β-blocking action[2].
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| ln Vivo |
Before coronary ligation, 3 mg/kg and 10 mg/kg MS-551 raised mean arterial pressure (MAP) by 14% and 33% and lowered heart rate by 6% and 12% in rats (a species lacking in functional cardiac IK). After reperfusion, MS-551 reduces the incidence of prolonged ventricular fibrillation (VF) and lengthens the QT interval[3].
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| References |
[1]. Lü-Pei Du, et al. The pharmacophore hypotheses of I(Kr) potassium channel blockers: novel class III antiarrhythmic agents. Bioorg Med Chem Lett. 2004 Sep 20;14(18):4771-7.
[2]. Ioannis N Pantazopoulos, et al. Nifekalant in the treatment of life-threatening ventricular tachyarrhythmias. World J Cardiol. 2011 Jun 26;3(6):169-76. [3]. J Chen, et al. IK independent class III actions of MS-551 compared with sematilide and dofetilide during reperfusion in anaesthetized rats. Br J Pharmacol. 1996 Nov;119(5):937-42. |
| Molecular Formula |
C19H28CLN5O5
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|---|---|
| Molecular Weight |
441.913
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| Exact Mass |
441.1779
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| CAS # |
130656-51-8
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| Appearance |
Typically exists as solids (or liquids in special cases) at room temperature
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| SMILES |
O=C1N(C)C(C=C(NCCN(CCO)CCCC2=CC=C([N+]([O-])=O)C=C2)N1C)=O.[H]Cl
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| InChi Key |
YPVGGQKNWAKOPX-UHFFFAOYSA-N
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| InChi Code |
InChI=1S/C19H27N5O5.ClH/c1-21-17(14-18(26)22(2)19(21)27)20-9-11-23(12-13-25)10-3-4-15-5-7-16(8-6-15)24(28)29/h5-8,14,20,25H,3-4,9-13H2,1-2H31H
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| Chemical Name |
2,4(1H,3H)-Pyrimidinedione, 6-((2-((2-hydroxyethyl)(3-(4-nitrophenyl)propyl)amino)ethyl)amino)-1,3-dimethyl-, monohydrochloride
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| Synonyms |
MS551 MS-551 MS 551
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| HS Tariff Code |
2934.99.9001
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| Storage |
Powder -20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month Note: Please store this product in a sealed and protected environment (e.g. under nitrogen), avoid exposure to moisture and light. |
| Shipping Condition |
Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)
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| Solubility (In Vitro) |
DMSO : ~125 mg/mL (~282.86 mM)
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| Solubility (In Vivo) |
Solubility in Formulation 1: ≥ 2.08 mg/mL (4.71 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution.
For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 2.08 mg/mL (4.71 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 20.8 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. View More
Solubility in Formulation 3: ≥ 2.08 mg/mL (4.71 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. |
| Preparing Stock Solutions | 1 mg | 5 mg | 10 mg | |
| 1 mM | 2.2629 mL | 11.3145 mL | 22.6290 mL | |
| 5 mM | 0.4526 mL | 2.2629 mL | 4.5258 mL | |
| 10 mM | 0.2263 mL | 1.1315 mL | 2.2629 mL |
*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.
Calculation results
Working concentration： mg/mL；
Method for preparing DMSO stock solution： mg drug pre-dissolved in μL DMSO (stock solution concentration mg/mL). Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug.
Method for preparing in vivo formulation:：Take μL DMSO stock solution, next add μL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O，mix and clarify.
(1) Please be sure that the solution is clear before the addition of next solvent. Dissolution methods like vortex, ultrasound or warming and heat may be used to aid dissolving.
(2) Be sure to add the solvent(s) in order.
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