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Register a new userStudding of the Effect of Storage, Heat and Iron Ions on the Stability of Vitamin C in some food
دراسة تأثير الحفظ و الحرارة و شاردة الحديد على ثبات فيتامين C في بعض الأغذية
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تم في هذا البحث تقدير كمية فيتامين C المستخلص من بعض أنواع الخضار و الفواكه الطازجة و ذلك بالاعتماد على طريقة المعايرة بصبغة 6,2- ثنائي كلورو فينول أندوفينول، و دراسة تأثير الحفظ و درجات الحرارة المختلفة (90, 60, 30) °C المستخدمة في عملية الطهي على محتوى بعض العينات المدروسة من فيتامين C. كما تضمن البحث دراسة تأثير الحديد على محتوى البندورة، البرتقال و الليمون من فيتامين C. أظهرت النتائج أن نسبة فيتامين C في العينات المدروسة: بقدونس، فليفلة حمراء، فليفلة خضراء، ليمون حامض، برتقال، بندورة (8, 22, 36, 144, 175, 133) mg /100 g على التوالي. بينما كانت نسبة الفقد في الفيتامين عند حفظ أوراق و ساق البقدونس لمدة 24 ساعة (66% 65%,) على التوالي. أما عند تعريض أوراق البقدونس لدرجات الحرارة (90, 60, 30)c° كانت نسبة الفقد في الفيتامين (62%, 41%, 24%) و ذلك على التوالي و عند حقن كل من البندورة و البرتقال و الليمون ب محلول شاردة الحديد الثلاثي المائية كانت نسبة الفقد في الفيتامين (38% ,64% ,79%) على التوالي.
In this research, the quantity of vitamin C which extracted from fresh fruits and vegetables was evaluate by using titration method with 6-2 Dichloro phenol andovinol, and studying the effect of conservation and different temperatures (30, 60, 90) °C which used in cooking on content of vitamin C for some samples. Also this search included studying of the effect of iron ions on content tomato, orange and lemon of vitamin C. The results showed that the concentration of vitamin c in studied samples: parsley, red pepper, green pepper, lemon, orange and tomato was (8, 22, 36, 144, 175, 133) mg/100g respectively. Losing of the vitamin was (66%, 65%) when we save the leaves and stalk of parsley for 24 hours respectively, when exposure the parsley leaves to the temperatures (30, 60, 90) c° the losing percentage was (24 %, 41%, 62 %), While the losing was (79%, 65%, 39%) when injected each of tomatoes, oranges, lemons with dissoluble of iron.
References used
FENNEMA, O.R. Food chemistry, 3nd. Ed., Marcel Dekker, Inc New York. U.S.A, 1996, 533-561-566
HOWARD, L.R. Antioxidant vitamin and phytochemical Content of fresh and processed pepper fruit. Chapter 13 in Handbook of Nutraceutical and Functional Food, Wildman, R.C., (Editor). CRC Press, Boca Raton, Florida, U.S.A, 2001
YOUNG, I. S.; WOODSDE, J. V. Antioxidants in health and disease, J. clinical pathology. 154, 2001, 176-186
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This experiment was conducted at Kharabo farm, Faculty of Agriculture,
University of Damascus. A total of 252 chicks of Japanese quail breeder females
were distributed on the first day of life into two groups, Gicks in G1 were
reared from 1-28 day
s of age under ideal required temperature according to
their age, while chicks in G2, were subjected to heat stress from 8 am to 5 pm at
42 °C from the first day of hatching until 28 day of age and to the ideal
required temperature from 5 pm until 8 am. Chicks of each group were
distributed into three subgroups, with three replicates per subgroup.
This study was conducted at Gharabo farm, Fac. Agric. Damascus
Universityin order to determine the effect of heat sress and level of vit. C on the
blood indicators of of Japanese quailc A total of 252 females Chicks were
distributed randomly into
two groups (G and G2) at one day of age, The chicks
in G1were subjected to an ideal temperature required according to their age up
to 30 days old, while the chicks in G2 were subjected to heat stress at 42 °C
during the daytime from 8 am to 5 pm and to ideal temperature from 5pm to
8am for the same period of rearing. Chicks of each group were distributed into
three subgroups given three levels of vitamin C: 0, 10 and20 g/l, with three
replicates for each sub-group during the rearing period. Blood samples were
collected from eighteen birds selected randomly from each group. Results
indicated that there was a significant increase in both red blood cells and
hemoglobin in the stressed group.
In research we studied the effect of vitamin C on the level of total
cholesterol ،triglycerides ، (HDL) and (LDL) in the stressful
rabbits blood by hydrogen peroxide (H2O2) . We used 30 rabbits
were divided into three groups:First groupnot stresse
d (control
group) ، Second group (Group stressed by H2O2) left without
treatment until the end of the experimental period ، third group
(Group stressful by hydrogen peroxide) was given orally vitamin C
solution at a rate of 100 mg / kg of body weight per a day for five
weeks.
Additive migration levels in food simulants from polymeric materials that
are intended to be into contact with food can be affected by additive stability
under the migration test conditions. In this work, the stability of four
antioxidants: Butyle
ted hydroxy toluene (BHT), Bisphenol A (BPA),
Pentaerythritol tetrakis (3,5-di-tert-butyl-4-hydroxyhydrocinnamate) (Irganox
1010), and Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate
(Irganox 1076), was studied in aqueous food simulants A, B, C and ethanol 95%
(as a substitute for olive oil- which is a fatty food simulant- simulant D), at
different temperatures 20, 40 and 70 ºC, during 20 days. Samples were
analyzed by high performance liquid chromatography (HPLC) with UV
detector. In general, the studied compounds appeared to be more stable in both
Ethanol (95%) and simulant B than in simulants A and C.
Additive migration levels in food simulants from polymeric materials that
are intended to be into contact with food can be affected by additive stability
under the migration test conditions. In this work, the stability of Dibutyl
adipate (DBA), Di
isobutyl adipate(DIBA), Diisobutyl phthalate (DIBP), Di-noctyl
phthalate (DnOP),and Diethylhexyl sebacate (DEHS).,was studied in
aqueous food simulants A, B, C and ethanol 95% (as a substitute for olive oilwhich
is a fatty food simulant, simulant D), at different temperatures 20, 40 and
70 ºC, during 20 days. Samples were analyzed by high performance liquid
chromatography (HPLC) with UV detector at 270 nm. The stability of the
studied compounds appeared to be least of all in simulant B, then in simulant
A, and finally in simulant C., When temperature and exposure time increase.,
on the other hand, the increase in temperature and exposure time have greatly
less effect on the stability of plasticizers in ethanol %95,as a substitute for olive
oil-which is a fatty food simulant.
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