RUDN University biochemists linked polyphenols in peach leaves to the antioxidant effect of their extract
RUDN University biochemists linked polyphenols in peach leaves to the antioxidant effect of their extract
Biochemists from RUDN University determined which substances in peach leaves provide the antioxidant effect their extract has. They investigated the composition of the powders obtained from leaves of several varieties of peach and found that high polyphenol content correlates with antioxidant properties. The results will help start production of antioxidants from natural sources.

Peach leaves are often used in folk medicine: for example, their infusion is used for gastritis, chronic bronchitis, and whooping cough. The therapeutic effect may be associated with the antioxidant effect of phenolic compounds in the leaves, for example, caffeic acid, chlorogenic acid, p-coumaric acid, kaempferol, quercetin, and others. The composition of peach fruits has been well studied, but there are few studies devoted to other parts of the plant, for example, leaves. Also, the composition and antioxidant properties of leaf extracts of different peach varieties have never been compared before.

Elena Pakina, associate professor of the Agrarian and Technological Institute of RUDN University, and her colleagues obtained an extract of dried leaves of seven peach varieties growing in Algeria. Varieties that differed from each other in the size and colour of the fruit were selected for research: Cardinal, Flavorcrest, Red Top, Spring Belle, Dixired, Romea, Tebana. The substances extracted from the leaves were separated using chromatography. The researchers then evaluated the content of phenolic compounds using spectrophotometry, and the total content of flavonoids using colorimetric analysis. The composition of the extracts was determined using mass spectrometry.

At the next stage, the biochemists evaluated the antioxidant capacity of the extracts, using DPPH analysis (2,2-diphenylpicrylhydrazyl, when reduced, transforms to a form coloured in yellow), ORAC methods (in which the loss of fluorescence by fluorescin indicated the presence of a peroxide radical), PFRAP (based on the reduction of Fe3+ ions to Fe2+ ions), and some others.

Fourteen phenolic compounds were found in the leaf extract of all seven peach varieties, which belong to two groups: hydroxycinnamic acids (chlorogenic and dicaffeoylquinic) and flavonols. Peach varieties can be divided into two groups, according to the content of phenolic compounds. The first one includes varieties with high concentration of active substances. The content of phenolic compounds in the dry extract of Romea and Red Top varieties varies from 386.5 to 392.2 milligrams per gram, for Dixired, Flavorcrest, and Tebana varieties this value is slightly lower and ranges from 320.6 to 346.6 milligrams per gram. The second group includes Cardinal and Spring Belle varieties, with concentration of 140 and 146 milligrams per gram, respectively.

In most tests, leaf extracts of Red Top and Romea varieties were the most active. The researchers found that the antioxidant properties of peach leaves are directly proportional to the total concentration of phenolic compounds.

The results of the study show that peach leaves can serve as a reliable source of natural antioxidants and the basis for the development of drugs for diseases associated with oxidative stress.

The article was published in the International Journal of Mass Spectrometry.

International scientific cooperation View all
03 Nov 2017
The main goal of the RUDN University and UNISDR Office for Northeast Asia and Global Education and Training Institute for Disaster Risk Reduction at Incheon (UNISDR ONEA-GETI) cooperation is to obtain knowledge about disaster risk reduction and international experience in this area for creating training courses for basic and additional professional education in RUDN
Visiting Professors View all
03 Nov 2017
Michele Pagano is a graduate of the University of Pisa, a leading scientist, the author of more than 200 publications in international journals, and a participant in many international research projects
Similar newsletter View all
22 Oct
RUDN chemist creates catalyst to produce anti-mosquito substances

A chemist from RUDN University has developed a catalyst for the production of eugenol acetate, a substance that destroys the larvae of mosquitoes transmitting dangerous diseases, being a safe chemical for human health.

22 Oct
RUDN soil scientists developed a new method for assessing soil fertility

RUDN soil scientists have revealed a direct correlation between the rate of soil formation of carbon dioxide, called CO2 emissions, and the content of microbial biomass in it. It is known that CO2 emission from soil is mainly conditioned by respiration of soil microorganisms and plant roots. The more CO2 soil emits, the more microbial biomass it usually contains. It was shown that CO2 emission by chernozem of different ecosystems (or different types of land use) correlates with the content of microbial biomass, and most closely with the rate of its microbial respiration. And the soil with good microbial properties has the “best quality”, is more fertile, provides the highest yield of crops and other plant biomass.

22 Oct
RUDN University chemists proposed a way to reduce three times the temperature for the oxidation of alkanes

RUDN University chemists and their colleagues from the Russian Academy of Sciences have proposed new catalysts that allow to reduce the temperature of the oxidation reaction of alkanes three times — from 150 to 50 degrees. This significantly reduces the cost of synthesizing alcohols, aldehydes and other compounds needed, in particular, for the production of nylon and capron.

Similar newsletter View all