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Document Type |
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Thesis |
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Document Title |
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Photo chemical studies scoped on some azo dyes runs through fod and textile chain دراسة كيميائية ضوئية على بعض أصباغ الازوالتي تستخدم في تصنيع الطعام والنسيج |
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Subject |
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College of Science for Girls |
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Document Language |
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Arabic |
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Abstract |
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In the second half of the 20 th Century , there has been a great increase in the use of food additives and textile dyes with varying levels of safety.
Many more additives especially colors have been introduced of both natural and artificial origin.
Reactions of some colors and dyes especially azo dyes have been reported occasionally in sensitive individuals symptoms include skin rashes, nasal congestion , hives, asthma and allergic activties .
So, our research scoped on studing the effect of light and oxygen on the five dyes used in different ways " food additive, dying of textile and drawing on the skin which called (tattoo)" . Photocatalytic and photooxygenation reactions were carried out of five dyes. These reactions explained the effect of free radicals on these dyes which degraded them into many compounds. The produced compounds consider harmful substances which may be linked with cancer and mutation.
Owing to this, part from our research included studing the effect of some formed compounds on the DNA, which showed damage or alkylation to DNA . This result is a good evidence on the harmful dyes which used in this research.
This studing subjected also to extraction of natural dyes and compared it with artificial ones, which showed that natural dyes is not harmful like artificial dyes .
Therefore this study recomended that natural colors and dyes are safety and must be used instead of synthetic ones which are harmful.
Nanotechnology is enabling technology that deals with nano-meter sized objects. It is expected that nanotechnology will be developed at several levels materials, devices and systems. The nano materials levels are the most advanced at present, both in scientific knowledge and in commercial applications. Nano particles materials as TiO2 were studied in this study. It was shown that the light reactivity of titanium dioxide nano particles, especially when with UV light, can enhance catalytic properties of surface to accelerate the photo catalytic reaction. |
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Supervisor |
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dr. |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1431 AH
2010 AD |
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Added Date |
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Monday, May 24, 2010 |
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Researchers
| نوره علي الزهراني | Alzahrani, Nourah Ali | Researcher | Master | |
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