METHOD FOR OBTAINING THE SUBSTANCE "DRY EXTRACT TRIBULUS" WITH A RESIDUAL AMOUNT OF BUTANOL LESS THAN 1 PPM T.A. Khajibaev, R.M. Khalilov S.Yu. Yunusov Institute of the Chemistry of Plant Substances Academy of sciences of the Republic of Uzbekistan st. Mirzo-Ulugbek, 77, 100170 Tashkent e-mail: hajibaev84@mail.ru
Tribulus terrestris L from the family
Zygophyllaceae is an annual creeping
herbaceous plant. In the world,
Tribulus terrestris L is distributed in warm areas of
Europe, America, Africa, Australia, and Uzbekistan. Furostanol-type steroid glycosides
from the aerial part of
T. terrestris have the property of increasing strength and muscle
mass of the body. At the Institute of Chemistry of Plant Substances, technology has been
developed for obtaining and serial production of the substance "Dry extract Tribulus" has
been launched with a content of furostanol saponins of at least 45% in terms of protodioscin
from the aerial part of
T. terrestris growing in Uzbekistan. “Dry extract Tribulus” is produced
in the Scientific and Technological Center for GMP Requirements of the Institute of
Chemistry Plant Substances according to the requirements of PA 42 Uz-3283-2021 for the
production of medicines and Tс 03535440-050:2022 for biological active supplements.
According to the requirements of PA 42 Uz-3283-2021, the residual amount of butanol in the
dry extract should be no more than 5000 ppm, and according to the requirements of solvents
Tс 03535440-050:2022, it should be 1 ppm.
As we reported earlier, when preparing an aqueous solution of furostanol saponins, when
concentrating the butanol extract, the ratio of dry mass and supplied water should be at least 1
kg: 30 l. In this case, the concentration of an aqueous solution of furostanol saponins must be
continued until a dry weight residue of 10%. As noted, this technique made it possible to
obtain a "Dry extract Tribulus" according to the requirements of PA 42 Uz-3283-2021.
However, with this technique, it was not possible to reduce the residual amount of butanol in
the dry extract below 1 ppm. In this regard, several experiments were carried out further and
based on the results, it was found that ethyl alcohol effectively removes the butanol residue
from an aqueous solution more than water. Thus, to obtain a "Dry extract Tribulus" that meets
the requirements of Tc 03535440-050:2022, we propose the following technology: aerial part
of
T. terrestris is extracted six times with 70% ethyl alcohol, concentrated, and diluted with
water. The aqueous solution of saponins is sequentially treated with chloroform and then with
ethyl acetate, the saponins are extracted from the purified solution with butanol and
concentrated the butanol extract, which at the end of the process is first submitted with water
in the ratio of the dry mass of the extract and the supplied water 1 kg: 20 l and is continued the
concentration process. Ethyl alcohol is sequentially fed into the aqueous solution of saponins
in the ratio of the dry mass of the solution and the supplied ethyl alcohol 1 kg: 10 l and is
continued the concentration process. Then, to remove the rest of the ethyl alcohol, water is
again added to the aqueous solution of saponins in the ratio of the dry mass of the extract and
the supplied water 1 kg: 10 l, and the solution is concentrated to the remainder of the dry mass
of the aqueous solution of 10-15%. An aqueous solution of furostanol saponins is dried in a
spray dryer "ZPG 150" at an inlet temperature of 170 ℃, an outlet of 90 ℃, supplying a
solution at a rate of 80 l/h, a spray head rotation speed of 8000 rpm, and a heat carrier velocity
of 2000 kg/h. Get "Dry extract Tribulus" with a yield of 3.2% to the weight of the raw material.