Biochemical structure of the leaves of a stevia introduced in ecological conditions of Kazakhstan

Abstract

Results of a research, on identification of biochemical structure of
leaves of various lines (broad-leaved, oval – leaved, narrow-leaved) are
presented to a Stevia rebaundiana Bertoni in article introduced in ecological conditions of the Southern Kazakhstan.
As a result of a research, it is shown that concentration of mineral elements (iron, zinc, phosphorus, selenium, manganese) and organic matters
(vitamins, proteins, carbohydrates) depend by nature lines of a stevia. It
is revealed, the high content of all mineral elements except a magnesium
(a selenium of 22,7 – 31,4%, iron of 5,9%, phosphorus of 22 – 26,8%,
Zincum of 5,8%, a mass fraction of calcium of 0,9 – 9,9%, a mass fraction of potassium oxide of 4,6-10,8%) in leaves of a broad – leaved stevia in comparison with other lines. In other lines of a stevia (narrow and
ovaloid leaved) accumulation iron and zincum was ovaloid identical. On
the maintenance of other mineral elements it was noted an essential difference as excess of concentration of a selenium (17,24%) and phosphorus
(6,25%) was observed in leaves of the narrow-leaved line, and calcium
(9,1%), an oxide potassium (6,9%) in leaves of the ovaloid line. And it
was also noted, raised contents of magnesium (6,7-8,3%) in the ovaloid
line in comparison with other lines. It is established that concentration
of mineral elements in all lines does not exceed the extreme admissible
concentration, and also leaves of all of the line are vitamin – rich (retinol, a
tocopherol, calciferous, thiamin, a pyridoxine, riboflavin, folic acid, niacin,
ascorbic acid), proteins and carbohydrates.
Key words: carbohydrates, food safety, mineral elements, proteins,
stevia, vitamins.