Magdić, Marija (2014) Ultrazvučna ekstrakcija i UV stabilnost prirodnih bojila iz biljnih materijala. Baccalaureus work - Undergraduate programme. Grafički fakultet. [Mentor: Rožić, Mirela].
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Abstract
U završnom radu provedeno je ispitivanje različito ekstrahiranih prirodnih bojila iz različitih biljnih materijala, kako bi se utvrdilo koja metoda ima veću iskoristivost. Metode koje su korištene su ekstrakcija magnetskim mućkanjem te ultrazvučna ekstrakcija. Također je provedeno ispitivanje osjetljivosti dobivenih bojila na ultraljubičasto zračenje, budući da su neka do sada provedena ispitivanja pokazala da su prirodna bojila uglavnom nestabilna na UV zračenje. U teorijskom dijelu rada objašnjena su prirodna bojila, njihovo nastajanje te fizikalno-kemijska svojstva, a u eksperimentalnom dijelu, opisan je laboratorijski postupak dobivanja bojila iz ploda cikle, graška i limuna, optička svojstva dobivenih bojila te njihova UV stabilnost. Ustanovljeno je da je veći prinos pigmenta dobiven pri ultrazvučnoj ekstrakciji, nego pri ekstrakciji mućkanjem. Bojila koja su bila duže izložena ultraljubičastom zračenju nisu mijenjala optička svojstva, odnosno promjene su minimalne, što govori da su određena prirodna bojila ipak UV stabilna.
| Item Type: | Baccalaureus work - Undergraduate programme |
|---|---|
| Mentor name: | Rožić, Mirela |
| Defence date: | 19 September 2014 |
| Abstract in english: | In the final paper, a survey of different natural dyes extracted from various plant materials was made, in order to determine which method has a higher efficiency. The methods that were used were extraction by magnetic stirring and ultrasound extraction. Also, light fastness of dyes to ultraviolet radiation was tested, because some studies conducted so far have shown that natural dyes are generally unstable to UV. In the theoretical part of the paper natural dyes will be explained, their formation and physicochemical properties, and in the experimental section, a description of laboratory method for making dyes from the fruit of beetroot, peas and lemon, the optical properties of the obtained dyes and their UV stability. It was found that the higher yield of the pigment was obtained at ultrasound extraction, than the extraction of magnetic stirring. Dyes that were more exposed to ultraviolet radiation have not changed optical properties, or changes are minimal, suggesting that certain natural dyes are actually UV stable. |
| Uncontrolled Keywords: | ekstrakcija, prirodna bojila, ultraljubičasto zračenje, optička svojstva |
| Keywords in english: | extraction, natural dyes, ultraviolet radiation, optical properties |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 21 |
| Callnumber: | rož 2014 mag |
| Inventory number: | Z559 |
| Depositing User: | Antonia Grgurović |
| Status: | Unpublished |
| Date Deposited: | 23 Sep 2014 07:27 |
| Last Modified: | 23 Sep 2014 07:27 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/2122 |
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