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Published on: March 8, 2020
Analytical studies of maridomycin. II. Separation of 9-propionylmaridomycins by thin-layer chromatography
Abstract:
Priopionyl derivatives of maridomycins, 9-propionylmaridomycins (PMDMs), are sixteen-membered ring macrolide antibiotics of six analogous components: I, II, III, IV, V and VI. The present paper deals with the separation and quantitative analysis of these components. The analysis was performed by thin-layer chromatographic separation, addition reaction of gaseous iodine with PMDMs on the plate, extraction of the PMDM-iodine complexes, and subsequent analysis of the amount of reacted iodine, using an automatic analysis system. To ascertain the reaction product of this system, PMDM III-iodine complex was synthesized separately under a liquid-phase reaction and the ratio of PMDM III and iodine atoms was determined to be 1:3 on physicochemical examination.
Insights
This study details a new method for separating and quantifying 9-propionylmaridomycins (PMDMs), macrolide antibiotics. The technique uses thin-layer chromatography and iodine reaction, enabling precise analysis of PMDM components.
Area of Science:
- Analytical Chemistry
- Organic Chemistry
- Pharmaceutical Science
Background:
- Maridomycins are macrolide antibiotics with a sixteen-membered ring structure.
- 9-propionylmaridomycins (PMDMs) are derivatives of maridomycins, existing as six analogous components (I-VI).
- Accurate separation and quantification of these PMDM components are crucial for their study and application.
Purpose of the Study:
- To develop and validate a method for the separation and quantitative analysis of 9-propionylmaridomycin (PMDM) components.
- To characterize the reaction product formed between PMDMs and iodine.
Main Methods:
- Thin-layer chromatographic separation of PMDM components.
- Addition reaction of gaseous iodine with PMDMs on the chromatography plate.
- Extraction of the resulting PMDM-iodine complexes.
- Quantitative analysis of the extracted iodine using an automatic analysis system.
- Synthesis and physicochemical examination of a PMDM III-iodine complex to determine the stoichiometric ratio.
Main Results:
- A method combining thin-layer chromatography and iodine complexation was established for PMDM analysis.
- The reaction product of PMDM III and iodine was synthesized and analyzed.
- The stoichiometric ratio of PMDM III to iodine atoms in the complex was determined to be 1:3.
Conclusions:
- The developed method allows for effective separation and quantitative analysis of 9-propionylmaridomycin components.
- The reaction with iodine provides a basis for the quantitative analysis of PMDMs.
- The established 1:3 stoichiometry of PMDM III to iodine is important for understanding the reaction mechanism.
