Isoflavones occurring in soybean seed have a positive effect on the health of
humans, especially in cancer prevention. This positive impact may be a result of their antioxidant
properties, estrogenic activity, or a combination of both mechanisms.
The purpose of this study was to quantify and compare levels of three major isoflavones in soybean seeds
from three sources (Alghab area, Faculty of Agriculture, imported from China).
Black tea which contains polyphenol is important for health benefits and it is
considered as antioxidant contents .
The extraction parameters, time and temperature and kind of solvent extraction, can
Influence the polyphenol concentrations of Blac
k tea, and were investigated in this study.
The purpose of the study was to quantify the polyphenols (catechin, epicatechin,
epigallocatechin, epicatechin gallate, epigallocatechin gallate)
in different kinds of teas ( Lipton , Alrabee , Layalina ) which are available in Syria
market.The study was conducted using two types of solvents methanol 70% the adoption
of the reference method adopted ISO14502-1 and water 100% , at different extraction
times (1, 3, 5, and 10 minutes) and extraction temperatures (60°C , 70 °C , 80°C, 90°C,
100°C). the total polyphenols content was determined using the phenol reagent (Folin
Ciocalteu reagent) adoption gallic acid as standard compound
the overall content values of polyphenols have been monitoring in extracts methanol
70% and water 100% .
In September-october 2014 the collected air green samples of
zizuphus jujuba was extracted .Suitable conditions were chosen to
separate the components of the volatile oil by the components of the
volatile oil by Gs/Ms and we noticed.
- 16 compoun
ds were found in the extracted volatile oil of the
extraction by petrolium ether, the main compound is palmetoleic acid ,
it form 29.13% of the volatile oil weight , and palmitic acid, it form
15.5% .Also volatile oil of the extracted from fresh leaves by steam
distillation contain 24 compounds, the main compound is Oleamid ,it
from 23.30% of the volatile oil weight.
Total Polyphenol was studied in olive leaves collected from Lattakia area
(AlQurdaha zone), where Phenolic compounds were extracted from dry Olive leaves by
using two extraction methods: maceration and Ultrasonic Device. By the both two methods
a
study was carried out on the extraction solvent concentration effect where the extraction
was done by using the mixture of Ethanol-Water with different percentages (60,70,80
%). As well, The extraction temperature effect was studied at the both methods at (20,30,
40°C); in addition to the study of the extraction time effect.
At the method of Maceration Extraction, the total polyphenols amount was studied in
dry olive leaves after extraction during different times (24,48,72 h). While at the Ultrasonic
Extraction the times were (10,20,30 min).
The study showed that the highest amount of phenolic compounds were existed in
dry olive leaves which were extracted by Ultrasonic Waves with the concentration of the
solvent ethanol-water 80%, temperature of 40°C, and with an extraction time of 20min.
