Phenols were studied in the leaves of Syrian olive varieties collected from (Harasta
and Ghouta, Damascus Countryside and Qalamun). Phenolic compounds were extracted
from the olive leaf varieties after disposal of plant pigments and fatty compounds, and
total phenols separated with solvent (methanol - water).
3,4-dihydroxybenzoic acid is one of phenolic compounds that exists in olive mill waste water (OMWW) and different industrial wastewater.Commercially activated charcoal was studied as absorbent of polyphenols. The value of specific surface area was 73
6.7189 m2/g. Equilibriums of 3,4-dihyroxybenzoic acid from aqueous solutions on four different particle sizes of the adsorbent with diameters ranged A(1000-2000), B(500-1000), C(250-500), D(125-250)m was examined at different initial concentrations ofabsorbate. The experimental data were analyzed using the Langmuir and Freundlich isotherm models. Both the isotherm models fit the adsorption data. Monolayer absorption capacities Q0 calculated from Langmuir equation were (0.36, 0.23, 0.34, 0.35mmol/g) for the different granular activated carbon sizes (A,B,C,D) respectively. The values of constant Kf calculated from Freundlich equation were (0.75, 0.61, 0.76, 0.79mmol/g) for the four sizes of granular activated carbon (A,B,C,D) respectively.
The results show that the charcoal activated carbon can be used as absorbent for polyphenol compounds.
Functional foods are similar to conventional food and demonstrate beneficial effects
beyond their nutritional value. These effects are attributed to the presence of functional
ingredients. Functional ingredients can either be found naturally in a c
ertain food or added
to it. There’s a number of functional food products available in the market. For example,
natural functional juices containing polyphenols. The aim of this study is to determine total
phenolic content and antioxidant activity in some local functional juices. Total phenolic
content was determined according to Folin- Ciocalteu method. The highest in content was
mulberry juice, while the lowest was red grape juice. The best conditions for eliminating
ascorbic acid were also determined which were heating for
30 min at 75°C. Antioxidant activity was subsequently determined using potassium
ferricyanide. The highest in phenolic content among the studied juices were the highest in
antioxidant activity. Thus a strong correlation was found between total phenolic content
and antioxidant activity.
The optimal conditions for the extraction of polyphenolic compounds from hard
Syrian wheatvarieties (Hourani, Doma1,Bohoos11) were determined using response
surface methodology. A Central Composite Design was used to investigate the effects of
thr
ee independent variables, namely solvent concentration, extraction temperature and
time on the response phenolic content. The independent variables were at three levels and
their actual values selected on the basis of preliminary experimental results. A secondorder
polynomial model was used for predicting the response.
Regression analysis showed that more than 95-97% of the variation was explained by
the models. The optimal conditions for phenolic compounds extraction were found to be
acetone concentration of 49.5 %v/v, extraction temperature of 55.5°C, extraction time of
42.5min, for wheat. Under the optimum conditions the corresponding predicted response
values for polyphenolic compounds were 0.976 mg EGA forHourani, 0.947 mg EGA
forDoma1 and 1.316 mg EGA for Bohoos11. The phenlics were extracted under optimum
conditions to check the validity of model, and the experimental values were 0.969±0.05
,0.932±0.03 and 1.214±0.06 mggalic acid equivalent /g dry weight from wheatvarieties
(Hourani, Doma1,Bohoos11) respectively. The good agreement between predicted and
,experimental values indicated suitability of the model employed and the success of
response surface methodology in optimizing the extraction conditions.
Ten medicinal plants were chosen from various plants in Syria which
used as spices or cooked and Syria traditional medicine. Their names
Rosemary, Damask rose, Chamomile, Sumac, Silver linden, Black
cumin, Thyme, Mint, Laurel and lemon balm.
Mois
ture, yield of extraction, total phenolic content (TPC) and
antioxidant activities of methanol, ethanol, acetone and aqueous extracts
of medicinal plants were investigated.
The TPC were measured by Folin-Ciocalteu method, and the antioxidant
activity was assessed by the scavenging activity towards 2, 2′-diphenyl-
1-picryl hydrazyl (DPPH)-radical.
The effect of phenolic compounds were extracted from leaves of Dan
and Toufahi sorts of Syrian olives, spread particularly in Damascus
country, studied on the activity of Guaiacol peroxidise in the celles of
Kolioptyl Zea myse L. Solutions of thre
e different concentrations of
phenolic extracts are used in the work : 25% , 50% and 100%.
In this research, the
antioxidant capacity(DPPH method), and total phenolic content (assayed
by Folin-Ciocalteu method), ,flavonoids, anthocyanins (pH differential
method) and ascorbic acids(2,6-dichlorophenol indophenol) in three fruit
tissues (
peel, pulp and whole fruit), of four apple cultivars commonly in
Syria(Red Delicious, Rome Beauty, Starking Delicious, Golden
Delicious), were studied.
This study evaluated the in vitro
antileishmanial activity of some Phenolic compounds including:
Ferulic acid, Mehtyl Ferulate, Ethyl Ferulate, and Sinapic acid
against leishmanial tropica promastigotes. The parasite viability
was determined using XTT proliferation Kit.
This study aimed at investigating the effect of some environmental factors on the phenolic
contents of the Rhus cotinus L. plant. Plant samples (leaves, flowers and bark) were
collected from three aspects (south, west and north) at four altitudes (
0-300, 300-600, 600-
900, ˃900m) in the countryside of Jableh in 2016. The fresh samples were extracted using
95% ethanol as an extraction solution, then the total contents of the phenolic compounds
were determined spectrophotometrically using the Folin-Ciocalteu reagent, expressing the
result by (mg gallic acid/1g fw) using a Spectrophotometer.
تطوير طرائق كروماتوغرافية - طيفية لتحديد بعض المركبات الفينولية كعوامل مضادة للأكسدة في الزيوت المصنعة محلياً
