RUDN University chemist developed green method for malaria and leprosy drug production
Many think of leprosy as a disease of the past; however, about 200 thousand cases of it are registered in the world (mainly in India, Brazil, and Nepal) every year. It is treatable with antibiotics that prevent the growth of the Mycobacterium bacteria. On the contrary, malaria is one of the most widely spread diseases in the world with over 200 million cases annually. The spread of its agent (a protist from the genus Plasmodium) also can be inhibited with antibiotics. Dapsone is a safe and available drug that works in both cases and is included in the WHO Model List of Essential Medicines. However, its production is not eco-friendly, as the synthesis reaction requires high temperatures and the use of aggressive acids (such as sulphuric acid). A chemist from RUDN University suggested a green technology of dapsone synthesis that could potentially help expand its production and make the drug available to more patients.
Dapsone or diaminophenyl sulphone consists of two benzene rings with NH2 amino groups. The rings are connected with an oxidized atom of sulfur, or an SO2 group. To obtain dapsone, manufacturers oxidize its precursor in which the bond between the rings is formed by an SH group (sulfur and hydrogen). However, oxidation can also affect sensitive amino groups. Therefore, they have to be protected before the reaction starts—for example, by attaching special protective groups to them. The researcher from RUDN University developed a catalyst that provides for the oxidation of SH groups in the precursor with simple hydrogen peroxide. Hydrogen peroxide is considered the most environmentally friendly oxidizing agent because its only by-product is water. The reaction of oxidation takes place at room temperature, has only one stage, and requires no protection of amino groups.
“None of the earlier dapsone synthesis reactions can be called completely environmentally friendly as they happen in rigid conditions and have several stages: adding protective groups, synthesis, and their removal. This complexity increases the chances of by-products that should be removed from the reaction,” said Raphael Luke, Ph.D., the head of the Molecular Design and Synthesis of Innovative Compounds for Medicine Science Center at RUDN University.
His team developed a wolfram-based catalyst from polyoxometalates by replacing certain wolfram atoms with vanadium. This increased the acidic properties of the catalyst and sped up the reaction, allowing it to take place even at low temperatures. To prevent the catalyst from being washed off from the reaction, the chemists encased the new compound in a porous material—a hydrogel made of propanoic acid and acrylamide. Thanks to it, the catalyst can be re-used at least three times without losing its efficiency. The team also identified the most optimal synthesis conditions and reagent concentration and managed to reach 100% oxidation of the dapsone precursor at 25C in only nine hours.
The results of the work were in the Microporous and Mesoporous Materials journal.
The RUDN University Science and Innovation Prize winners were honoured at the extended meeting of the Academic Council. In 2024 the terms of the traditional RUDN University Prize were changed: for the first time the competition was announced in two categories: leading scientists and young scientists.
According to the International Energy Agency (IEA), electricity consumption in Africa has increased by more than 100% over the past two years (2020-2022). However, 74.9% of this energy is still produced by burning organic fuels 鈥� natural gas, coal and oil. At the same time, the level of electrification on the continent remains extremely low 鈥� only 24%, while in other developing countries it reaches 40%. Even in grid-connected areas, electricity supply is often unreliable: industrial enterprises lose energy on an average of 56 days a year.
Today, diagnosis and treatment planning with orthodontists takes several days. Also, complications can arise during treatment that slow down the patient's recovery process. For example, improper orthodontic treatment planning can lead to temporomandibular joint dysfunction.
The RUDN University Science and Innovation Prize winners were honoured at the extended meeting of the Academic Council. In 2024 the terms of the traditional RUDN University Prize were changed: for the first time the competition was announced in two categories: leading scientists and young scientists.
According to the International Energy Agency (IEA), electricity consumption in Africa has increased by more than 100% over the past two years (2020-2022). However, 74.9% of this energy is still produced by burning organic fuels 鈥� natural gas, coal and oil. At the same time, the level of electrification on the continent remains extremely low 鈥� only 24%, while in other developing countries it reaches 40%. Even in grid-connected areas, electricity supply is often unreliable: industrial enterprises lose energy on an average of 56 days a year.
Today, diagnosis and treatment planning with orthodontists takes several days. Also, complications can arise during treatment that slow down the patient's recovery process. For example, improper orthodontic treatment planning can lead to temporomandibular joint dysfunction.