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undergraduate thesis
Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora
2022. urn:nbn:hr:182:561520
Duković, Iva
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of Analytical, Organic and Applied Chemistry

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Duković, I. (2022). Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora (Undergraduate thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:561520

Duković, Iva. "Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2022. https://urn.nsk.hr/urn:nbn:hr:182:561520

Duković, Iva. "Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2022. https://urn.nsk.hr/urn:nbn:hr:182:561520

Duković, I. (2022). 'Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 22 January 2025, https://urn.nsk.hr/urn:nbn:hr:182:561520

Duković I. Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2022 [cited 2025 January 22] Available at: https://urn.nsk.hr/urn:nbn:hr:182:561520

I. Duković, "Ispitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:182:561520

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TitleIspitivanje utjecaja otapala na primjenu plodova vinobojke, Phytolacca sp. L., kao kiselo-baznog indikatora
Title (english)Study of the solvent effect on the application of Phytolacca sp. L. as acid-base indicator
AuthorIva Duković
MentorAna Amić (mentor)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of Analytical, Organic and Applied Chemistry)
Osijek
Defense date and country2022-09-23, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Applied Chemistry
Abstract
Indikator je sredstvo koje ukazuje na stanje ili promjene stanja nekog sustava, a u kemiji se koristi kao tvar koja promjenom boje pokazuje prisutnost neke druge tvari te kako bi se odredila pH vrijednost medija. Konvencionalni kiselo-bazni indikatori se pripremaju u kemijskom laboratoriju, primjeri takvih indikatora su metil crveno, lakmus papir i fenolftalein. Jeftinija i manje štetna varijanta indikatora su alternativni odnosno prirodni kiselo-bazni indikatori. Primjeri takvih indikatora su kurkuma, crveni kupus, grožđe, luk i dr. U ovom radu ispitani su plodovi vinobojke (Phytolacca sp.) kao kiselo-bazni indikator. Vinobojka ima bobice tamno ljubičaste boje, što sugerira na prisutnost betacijanina, te se pretpostavlja da ima potencijal kao kiselo-bazni indikator. U radu su pripremljeni i ispitani indikatori od suhih i svježih zrelih plodova vinobojke u hladnoj i vrućoj vodi, metanolu, acetonu i etanolu. Prema dobivenim rezultatima, svježa vinobojka daje vizualno dojmljivije rezultate u odnosu na suhu vinobojku, a obje daju najintenzivniju promjenu pri pH = 14. Od otapala se metanol pokazao najpogodnijim za pripremu ovih indikatora, iako su i ostala korištena otapala pokazala određeni potencijal.
Abstract (english)
Indicator shows the state or changes of the state of a system, and in chemistry an indicator shows the presence of another substance by changing colour and is used to determine the pH value of a medium. Conventional acid-base indicators are prepared in a chemical laboratory, examples of such indicators are methyl red, litmus paper and phenolphthalein. A cheaper and less harmful version of indicators are alternative or natural acid-base indicators. Examples of such indicators are turmeric, red cabbage, grape, onions, etc. In this thesis, the fruit of the pokeweed (Phytolacca sp.) were tested as an acid-base indicator. Pokeweed has dark purple berries hence it is assumed that they contain betacyanins and could be used as an acid-base indicator. So, in this work, indicators made form dry and fresh ripe pokeweed berries with cold and hot water, methanol, acetone and ethanol were prepared and tested. According to obtained results, fresh pokeweed showed visually more impressive results, and fresh and dried pokeweed had the most intensive colour change at pH = 14. Of all used solvents, methanol seems to be the best for preparation of these indicators, though other solvents showed potential too.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:561520
Study programmeTitle: Chemistry
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2022-11-02 09:40:48