AMINO ACID COMPOSITION OF STEVIA RAW MATERIALS OF DIFFERENT ORIGIN
UDC 615.322:543.422.3
Abstract
Dried stevia leaves (Stevia rebaudiana Bertoni) were used as objects of research. We studied the leaves of stevia varieties Ramon sweetener grown in the Penza region, the leaves of stevia varieties Ramon sweetener grown in the Tver region, Krasnodar region, the Republic of Crimea, as well as imported raw stevia from India and Paraguay. The purpose of this work is a comparative study of the amino acid composition of raw stevia grown in different conditions.
The amino acid composition of stevia leaves (Stevia rebaudiana Bertoni) was revealed by capillary electrophoresis.13 amino acids were identified, of which eight are "essential" (lysine, phenylalanine, histidine, leucine, isoleucine, methionine, valine, threonine). The proportion of essential amino acids in stevia raw materials ranged from 2.99 to 4.64%. The content of interchangeable acids was: tyrosine from 0.24% to 0.36%, Proline from 0.44 to 0.68%, serine from 0.77 to 1.03%, alanine from 0.48 to 0.83%, glycine from 0.40 to 0.68%. The total amount of amino acids detected is higher in the Ramon sweetener variety grown in the Penza region (9.52%) compared to other samples, the lowest amount is found in stevia grown in Paraguay (6.46%). The results obtained indicate the prospects for further studies of the amino acid composition of Stevia rebaudiana and can characterize this species as a source of valuable medicinal substances with a wide range of pharmacological activity.
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