N-Demethylerythromycin A
(Synonyms: N-去甲基红霉素A) 目录号 : GC40852
A metabolite of erythromycin
Cas No.:992-62-1
Sample solution is provided at 25 µL, 10mM.
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Quality Control & SDS
- View current batch:
- Purity: >95.00%
- COA (Certificate Of Analysis)
- SDS (Safety Data Sheet)
- Datasheet
N-Demethylerythromycin A is a metabolite of erythromycin . It is also a fungal metabolite that has been found in S. erythreus and a potential impurity in commercial preparations of erythromycin.
| Cas No. | 992-62-1 | SDF | |
| 别名 | N-去甲基红霉素A | ||
| Canonical SMILES | C[C@@H]([C@@H]([C@H](C(O[C@@H]1CC)=O)C)O[C@@]2([H])C[C@](OC)(C)[C@@H](O)[C@H](C)O2)[C@H]([C@@](O)(C)C[C@H](C([C@@H]([C@@H](O)[C@]1(C)O)C)=O)C)O[C@@](O[C@H](C)C[C@@H]3[NH]C)([H])[C@@H]3O | ||
| 分子式 | C36H65NO13 | 分子量 | 719.9 |
| 溶解度 | Chloroform: soluble,Methanol: soluble | 储存条件 | Store at -20°C |
| General tips | 请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。 储备液的保存方式和期限：-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。 为了提高溶解度，请将管子加热至37℃，然后在超声波浴中震荡一段时间。 |
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| Shipping Condition | 评估样品解决方案：配备蓝冰进行发货。所有其他可用尺寸：配备RT，或根据请求配备蓝冰。 | ||
| 制备储备液 | |||
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1 mg | 5 mg | 10 mg |
| 1 mM | 1.3891 mL | 6.9454 mL | 13.8908 mL |
| 5 mM | 0.2778 mL | 1.3891 mL | 2.7782 mL |
| 10 mM | 0.1389 mL | 0.6945 mL | 1.3891 mL |
| 第一步：请输入基本实验信息（考虑到实验过程中的损耗，建议多配一只动物的药量） | ||||||||||
| 给药剂量 | mg/kg |  |
动物平均体重 | g | |
每只动物给药体积 | ul | |
动物数量 | 只 |
| 第二步：请输入动物体内配方组成（配方适用于不溶于水的药物；不同批次药物配方比例不同，请联系GLPBIO为您提供正确的澄清溶液配方） | ||||||||||
| % DMSO % % Tween 80 % saline | ||||||||||
| 计算重置 | ||||||||||
计算结果:
工作液浓度： mg/ml；
DMSO母液配制方法： mg 药物溶于 μL DMSO溶液（母液浓度 mg/mL，
体内配方配制方法：取 μL DMSO母液，加入 μL PEG300，混匀澄清后加入μL Tween 80，混匀澄清后加入 μL saline，混匀澄清。
1. 首先保证母液是澄清的；
2.
一定要按照顺序依次将溶剂加入，进行下一步操作之前必须保证上一步操作得到的是澄清的溶液，可采用涡旋、超声或水浴加热等物理方法助溶。
3. 以上所有助溶剂都可在 GlpBio 网站选购。
Semi-automated preparation of a 11C-labelled antibiotic--[N-methyl-11C]erythromycin A lactobionate
Int J Appl Radiat Isot 1984 Feb;35(2):103-9.PMID:6231252DOI:10.1016/0020-708x(84)90192-3.
A fast semi-automated method is described for labeling the antibiotic, erythromycin A (1), with the short-lived positron-emitting radionuclide, 11C (t 1/2 = 20.4 min), in order to permit the non-invasive study of its tissue uptake in vivo. Labelling was achieved by the fast reductive methylation of N-Demethylerythromycin A (2) with [11C]formaldehyde, itself prepared from cyclotron-produced [11C]-carbon dioxide. Rapid chemical and radiochemical purification of the [N-methyl-11C]erythromycin A (3) were achieved by HPLC and verified by TLC with autoradiography. The purified material was formulated for human i.v. injection as a sterile apyrogenic solution of the lactobionate salt. The preparation takes 42 min from the end of radionuclide production and from [11C]carbon dioxide produces [N-methyl-C11]erythromycin A lactobionate in 1-12% radiochemical yield, corrected for radioactive decay.
Thin-layer chromatographic study of the metabolites of erythromycins in the Wistar rat
J Chromatogr 1988 Dec 29;434(1):177-86.PMID:3243811DOI:10.1016/0378-4347(88)80072-0.
The metabolites of erythromycin A, anhydroerythromycin A, N-Demethylerythromycin A and erythromycin B in the Wistar rat were studied by thin-layer chromatography. In some experiments germ-free rats, rats with a cannulated bile duct and a gastrectomized rat were used. The erythromycins examined were shown to undergo two principal changes, N-demethylation and acid-catalysed degradation. It was demonstrated that the stomach and the liver are not the sole sites of acid degradation and demethylation of erythromycins, respectively. Erythromycin A gives three principal metabolites, anhydroerythromycin A, anhydro-N-demethylerythromycin A and N-Demethylerythromycin A, and erythromycin A enol ether and N-Demethylerythromycin A enol ether are present to a minor extent. 5-O-Desosaminylerythronolide A was also identified, suggesting the presence of an erythromycin glycosidase.
Separation of erythromycin and related substances by high-performance liquid chromatography on poly(styrene-divinylbenzene) packing materials
J Chromatogr 1985 Aug 23;330(2):275-86.PMID:4066823DOI:10.1016/s0021-9673(01)81984-1.
A comparative evaluation of three brands of poly(styrene-divinylbenzene) copolymers, Hamilton PRP-1 (10 micron), Rogel (8 micron) and TSK-Gel (10 micron), as column packing materials for high-performance liquid chromatographic separation of erythromycins is presented. Erythromycins A, B and C, anhydroerythromycin A, erythromycin A enol ether, N-Demethylerythromycin A, anhydro N-Demethylerythromycin A and N-Demethylerythromycin A enol ether were chromatographed. The effects of column temperature, concentration of organic modifier in the mobile phase, concentration of phosphate buffer, the addition of quaternary ammonium salts and pH are described. The best separations were obtained on TSK-Gel with the mobile phase acetonitrile-methanol-0.2 M tetramethylammonium hydroxide pH 8.0-0.2 M phosphate buffer pH 8.0-water (30:15:25:5:25). PRP-1 and Rogel gave equally good separations but with higher retention volumes.
Determination of erythromycin and related substances by capillary electrophoresis
J Chromatogr B Biomed Sci Appl 1997 Dec 19;704(1-2):343-50.PMID:9518168DOI:10.1016/s0378-4347(97)00458-1.
Current compendial methods of assay for the analysis of erythromycin and its related substances involve the use of microbiological techniques. These techniques are non-selective and tedious, thus there is a need for the development of highly specific, quantitative analytical methods. Erythromycin was analysed in a 50 mM phosphate buffer (pH 7.5) and run at an applied voltage of 20 kV. Detection sensitivity was enhanced by using a wavelength of 200 nm and selecting an injection solvent of lower conductivity than the electrolyte: acetonitrile-water (20:80, v/v). In order to facilitate the separation of erythromycin and its related substances, the organic solvent ethanol (35%, v/v) was incorporated into a modified 150 mM phosphate buffer (pH 7.5) and run at an applied voltage of 30 kV. Resolution of all the compounds was achieved in approximately 45 min. The methods described are accurate and precise and thus suitable for the quantitative determination of erythromycin and the related substances, erythromycin C, anhydroerythromycin and N-Demethylerythromycin A.
Optimization of the separation of erythromycin and related substances by high-performance liquid chromatography
J Chromatogr 1987 Nov 13;409:91-100.PMID:3693497DOI:10.1016/s0021-9673(01)86786-8.
An improved high-performance liquid chromatographic method for analysis of erythromycin is described. The separation can be performed under mild conditions of pH (6.5) and temperature (35 degrees C) on C8 and C18 silica-based reversed-phase materials of different origins. The mobile phase, with a flow-rate of 1.5 ml/min, contained various amounts of acetonitrile (25-40%, v/v), 5% (v/v) 0.2 M ammonium phosphate buffer pH 6.5, 20% (v/v) 0.2 M tetramethylammonium phosphate and water. UV detection at 215 nm allows quantitation of erythromycins A, B and C, N-Demethylerythromycin A, erythromycin A enol ether and anhydroerythromycin A. The column history plays a major role, older columns often giving better separations.