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Register a new userExtracting organic compounds from some Syrian citrus Peels for to be used as natural antioxidants
استخلاص مركبات عضوية من قشور بعض الحمضيات السورية لاستخدامها كمضادات أكسدة طبيعية
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Added by
University of Aleppo رسالة ماجستير
Publication date
2014
fields
Pharmacy
and research's language is
العربية
Created by
Shamra Editor
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تم في هذا البحث تحديد المحتوى الكلي للفينولات والفلافونوئيدات لقشور بعض الحمضيات السورية ودرست الفعالية الكلية المضادة للأكسدة لها , كما تم دراسة تأثير تغيير طريقة الاستخلاص على هذه الفعالية والمحتوى .
In this research, the total content of phenols and flavonoids was determined from the peels of some Syrian citrus fruits and the total antioxidant activity of them was studied, and the effect of changing the extraction method on this activity and content was studied.
References used
المجموعة الإحصائية الزراعيةلعام 2012 - مديرية التخطيط والتعاون الدولي ( قسم الإحصاء ) وزارة الزراعة والإصلاح الزراعي في سورية
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Essential oils from peels of 6 citrus species were extracted. The species were
lemon (Citrus limon), orange (C. sinensis), grapefruit (C. paradisi), pomelo
(C. maxima), mandarin (C. reticulata) and bitter lemon (C. aurantium) using
hydro-distillat
ion (Clevenger type).
In general Gram-positive bacteria were more sensitive to the oil
extracts tested than Gram-negative bacteria, and P. aeruginosa was the most
sensitive within the Gram-negative group.
In our work, we chose to follow semantic transfer based approach. Our approach consists of two main phases. The first phase, Natural Language Analysis phase, aims to analyze the text and extract the required knowledge from it. In addition to the synt
actic analysis results, one of the main outputs for this phase is a concept map which summarize the concepts of the related domain and the relationships between these concepts.
The aim of this research, is to use Liquid–liquid extraction to separate
phenolic compounds from olive mill wastewater resulted from three-phase
centerfuge extraction (OMWW). Four solvents were used: Methyl iso butyl
ketone (MIBK), Ethyl acetate (
EtOAc), Octanol-1 (C8H18O), and Noctanoylpyrrolidine
(OPOD) which was synthesized in our lab. The effects of
pH and Extraction stages on the efficiency of total phenolic compound
extracted from OMWW were determined by Folin - Ciocalteu
spectrophotometric method. Ferulic acid (FA) and Caffeic acid (CA) were
determined in extractants by HPLC. The COD value in water phase of the four
extracts was measured together with the reducing power and radicalscavenging
effects for the extracts. We compared the antioxidant activity of
MIBK, OPOD extracts, with ferulic acid (FA), caffeic acid (CA), ascorbic acid
standards and rosemary.
The results showed that MIBK had the highest extraction efficiency and
gave the maximum quantity of phenols from OMWW, than OPOD, C8H18O,
EtOAc. The COD value was decreased about %94.5 by MIBK, %83.7 by
OPOD,%81 by C8H18O, and%72 by EtOAc. The phenols extracted by MIBK
could be added to eatable oils as natural antioxidants, because they were
superiority on rosemary, and nearly to caffeic acid (CA) standard.
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).
The phenolic compounds were extracted from leaves and flowers of Hops and grape
seeds from local production by soaking with different solvents (Methanol-ethanol-alcohol
and water mixture) . The polyphenols content in the methanol extracts for 100 g
dry matter
was 6.31 g for the grape seeds, 2.08 g for Hops leaves and 0.6 g for Hops flowers.
Methanol extracts were characterized by an antioxidant activity that appeared by their
ability to Reduce ions ferriques Fe+3, at a concentration of 2500 ppm, the Reducing Power
was 96.45% , 67.56% for the grape seeds and Hops leaves, respectively. The methanolic
extracts of grape seeds and Hops leaves at 80 ppm showed activity in scavenge free radical
DPPH. was 82.04% and 40.92% respectively. The methanolic extracts of grape seeds and
Hops leaves at 250 ppm gave the ability to protect linoleic acid from the oxidation process
of 78.98% and 48.41%, respectively. The antioxidant activity values of the extracts were
compared with standard samples of ascorbic acid and BHT.
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