RUDN chemists improved the method of extracting natural antioxidants from bay leaves
Isolation of the desired compounds from plant materials by traditional methods takes a lot of time and a large amount of solvent. One of the promising technologies is mechanochemical processing, in which raw materials are processed mechanically to destroy cell walls before extraction. This treatment does not require solvents and reduces production costs. However, there are still very few studies on the use of mechanochemistry for the extraction of natural compounds.
At the first stage of the experiment, the researchers got the extract from leaves using three different solvents: ethanol, methanol and water. Then they used the ultrasonic, microwave, and mechanochemical extraction methods. In the case of the mechanochemical method, the chemists tested different variants of additives — carbonates.
For each of the methods, the authors measured the antioxidant activity of the obtained samples, the total amount of dissolved substances and the amount of phenols. It turned out that the specific antioxidant ability was greater for the extract in ethanol, so in a further study it was ethanol that was used as the main solvent.
Then the chemists investigated the properties of various carbonates as additives for mechanochemical processing. Without carbonates, the extraction is even better than with them, with the exception of lithium carbonate, therefore, Li2CO3 was used as an additive for mechanochemical extraction. The authors then compared mechanochemical processing with microwave and ultrasound processing. In the case of mechanochemical processing, the product yield is higher and the extraction takes less time.
Next, the chemists compared the composition of the extracts obtained by classical, mechanochemical, microwave and ultrasonic extraction. Apparently the main component of the extracts is the by-products formed during the degradation of cell walls. The extracts also contained such essential oils as eucalyptol, eugenol, linalool, and caryophyllene. Eucalyptol and linalool have antimicrobial activity, and eugenol and caryophyllene are among the strongest natural antioxidants. Most target substances and least by-products were extracted by microwave extraction.
The chemists note that mechanochemical extraction is the most promising method for the separation of chemical compounds from plant materials, because with the same content of the necessary substances, the extraction time is reduced by 10 times compared to other technologies. Replacing traditional methods with mechanochemical ones would be a big step forward, since this method meets all the principles of “green chemistry”.
The work was published in the journal Industrial Crops & Products.
Heavy metals suppress enzyme activity in the soil by 3-3.5 times and have especially prominent effect on the enzymes that support carbon and sulfur circulation. This was discovered by a soil scientist from RUDN together with his colleagues from Chile, Germany, the UK and Venezuela. The data obtained by the team can lead to more efficient use and fertilization of agricultural lands.
The RUDN University Academic Council Commission on Foreign Languages held its June research seminar in cooperation with international community of language teachers who became part of the international pro-bono project on challenges and solutions to foreign languages training during COVID-19.
Biologists from RUDN University described the role of tropical rainforests in the production of methane, the second most harmful greenhouse gas after CO2. It turned out that some areas of rainforests not only consumed methane but also emitted it.