Abstract:
nformation about the stability in time of the concentrations of total
poly-phenols and anthocians in the vegetal alcoholic extracts obtained from
the seeds and skins of Vitis vinifera or other vegetal sources rich in these
compounds is not present in the specialized literature. This aspect is very
important since the vegetal alcoholic extracts represent either the raw
material from which, by complex methods, they isolated pure active
principles, or they are used as such in different pharmaceutical, cosmetic and
food products due to the benefic effects on the human health. [3,5] Starting
from these we want to study the stability in time of the total poly-phenols and
anthocians from the alcoholic extracts obtained from the seeds and skins of
Vitis vinifera.
The degree of stability of the concentrations of total poly-phenols,
anthocians and the index of tanoid matters (ITM) was appreciated by
calculation to % the values obtained at To as compared to the ones
determined at given time intervals. We did not notice a specific manifestation
of the stability in time depending on the grapes breed used as a raw material
for the obtaining of alcoholic extracts. The experiment revealed that the total
poly-phenols are stable in the first 3 months, but at 6 months the percentage
values of the concentrations decrease so that at 9 months the degree of
decrease of concentrations frequently surpasses 50%. All the alcoholic
extracts, a significantly better stability of anthocians as compared to the
stability of poly-phenols registering percentage values very high of
concentrations even after 9 months from the moment of obtaining the
extracts.
