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undergraduate thesis
Spektrofotometrijska studija sustava škrob-trijodid
2012. urn:nbn:hr:182:220112
Karnaš, Maja
Josip Juraj Strossmayer University of Osijek
Department of Chemistry

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Karnaš, M. (2012). Spektrofotometrijska studija sustava škrob-trijodid (Undergraduate thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:220112

Karnaš, Maja. "Spektrofotometrijska studija sustava škrob-trijodid." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2012. https://urn.nsk.hr/urn:nbn:hr:182:220112

Karnaš, Maja. "Spektrofotometrijska studija sustava škrob-trijodid." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2012. https://urn.nsk.hr/urn:nbn:hr:182:220112

Karnaš, M. (2012). 'Spektrofotometrijska studija sustava škrob-trijodid', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 26 October 2024, https://urn.nsk.hr/urn:nbn:hr:182:220112

Karnaš M. Spektrofotometrijska studija sustava škrob-trijodid [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2012 [cited 2024 October 26] Available at: https://urn.nsk.hr/urn:nbn:hr:182:220112

M. Karnaš, "Spektrofotometrijska studija sustava škrob-trijodid", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2012. Available at: https://urn.nsk.hr/urn:nbn:hr:182:220112

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Metadata
TitleSpektrofotometrijska studija sustava škrob-trijodid
Title (english)Spectrophotometric study of starch-triiodide system
AuthorMaja Karnaš
MentorMilan Sak-Bosnar (mentor)
MentorNikola Sakač (komentor)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
Osijek
Defense date and country2012-08-27, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Škrob je polisaharid pohranjen u biljkama kao rezervna hrana. Po kemijskom sastavu on je smjesa dvaju polimera D-glukoze, amiloze i amilopektina. Kada se otopini škroba doda otopina joda u kalijevom jodidu (otopina trijodida I3- ili Lugolova otopina) nastaje intenzivno modro ili, rjeđe, smeđe obojenje. To obojenje posljedica je nastajanja kompleksa škroba i trijodidnog iona. Koncentracija kompleksa, a samim time i koncentracija škroba može se odrediti spektrofotometrijski mjerenjem apsorbancije danog uzorka. Omjer amiloze i amilopektina varira ovisno o vrsti škroba. Kompleks s trijodidom čine obje komponente škroba, amiloza tvori jaki tamnoplavi, a amilopektin slabi smeđi kompleks. U istraživanju je pokazano kako se apsorpcijski spektri amiloza – trijodid kompleksa mogu uzeti kao parametar za određivanje botaničkog porijekla škroba. Uočene su razlike između različitih vrsta škroba u samom intenzitetu obojenja pri nastanku kompleksa, apsorpcijskom maksimumu te pomaku apsorpcijskog maksimuma u odnosu na reprezentativni uzorak.
Abstract (english)
Starch is a polysaccharide stored in plants as a food reserve. According to its chemical composition it is a mixture of two D-glucose polymers, amylose and amylopectin. When a solution of iodine in potassium iodide (triiodide solution I3- or Lugol solution) is added to a starch solution, intensive dark blue or, rarely, brown coloration appears. This coloration is a result of yielded starch-triiodide complex. Concentration of this complex and thus the concentration of starch can be determined spectrophotometricaly by measuring the absorbance of the given sample. Volume fraction of amylose and amylopectin varies depending on the starch type. Both starch components yield complex with triiodide, amylose yields strong dark blue and amylopectin weak brown complex. Therefore the absorption spectra of amylose-triiodide complex can be taken as a parameter for determination of botanical origin of starch, as presented in this research. Noted differences between various starch types are in the intensity of coloration due to complex formation, maximum wavelength of absorbance and the shift of maximum wavelength of absorbance when compared to representative sample.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:220112
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 on2016-07-12 07:37:53