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undergraduate thesis
Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2014. urn:nbn:hr:159:622402
Suić, Danijela
University of Zagreb
Faculty of Food Technology and Biotechnology
Department of Food Engineering
Laboratory for Chemistry and Technology of Carbohydrates and Confectionery Products

Institutional repository: Repository of the Faculty of Food Technology and Biotechnology

Cite this document

Suić, D. (2014). Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:622402

Suić, Danijela. "Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2014. https://urn.nsk.hr/urn:nbn:hr:159:622402

Suić, Danijela. "Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2014. https://urn.nsk.hr/urn:nbn:hr:159:622402

Suić, D. (2014). 'Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja', Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 11 March 2025, https://urn.nsk.hr/urn:nbn:hr:159:622402

Suić D. Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2014 [cited 2025 March 11] Available at: https://urn.nsk.hr/urn:nbn:hr:159:622402

D. Suić, "Potencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja", Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2014. Available at: https://urn.nsk.hr/urn:nbn:hr:159:622402

Metadata
TitlePotencijal primjene proteina sirutke za poboljšanje inkapsulacijske učinkovitosti polifenola zelenog čaja
Title (english)The potential of using whey proteins for improving the encapsulation efficiency of green tea polyphenols
AuthorDanijela Suić
MentorDraženka Komes (mentor)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
(Department of Food Engineering)
(Laboratory for Chemistry and Technology of Carbohydrates and Confectionery Products)
Zagreb
Defense date and country2014-09-11, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Food Technology
Abstract
S obzirom na visok udjel polifenolnih spojeva i metilksantina, posebice kafeina u zelenom čaju, u ovom radu ispitana je ekstrakcijska učinkovitost ovih spojeva iz zelenog čaja kao model-sustava te njegova inkapsulacija u čestice različitih kombinacija alginata, proteina sirutke i kitozana. Usporedbom primjenjenih ekstrakcijskih postupaka, pokazalo se da je optimalni ekstrakcijski postupak ponovljena (dvostruka) konvencionalna ekstrakcija miješanjem na 80°C tijekom 15 minuta. Dobiveni ekstrakt sadržavao je 5 250 mg ekv. galne kiseline/L ekstrakta ukupnih polifenola te je inkapsuliran u čiste alginatne čestice, kombinaciju alginata s proteinima sirutke (8:2) te istu kombinaciju s kitozanskim omotačem. Dobivenim česticama ispitana su morfološka svojstva, veličina čestica, tekstura, inkapsulacijska učinkovitost te otpuštanje iz hidrogel i osušenih čestica. Rezultati su pokazali da je primjena proteina sirutke u kombinaciji s alginatom omogućila poboljšanje parametara inkapsulacije (veličina čestica, inkapsulacijska učinkovitost, produljenje otpuštanja) u odnosu na čiste alginatne čestice. Kao optimalan sustav pokazale su se alginatno-proteinske čestice s kitozanskim omotačem budući da su omogućile 89,2% inkapsulacije ukupnih polifenola te postepeno otpuštanje ovih spojeva u vodi i do 120 minuta.
Abstract (english)
Considering the high content of polyphenols and methylxanthines, especially caffeine in green tea, in this work the extraction efficiency of these compounds from green tea as a model system and its encapsulation in different combinations of alginate, chitosan and whey proteins was studied. By comparing the employed extraction procedures of green tea, it was established that repeated conventional extraction by stirring at 80 ° C for 15 minutes was the optimal extraction procedure. The obtained extract exhibited 5 250 mg eq. gallic acid/L of total polyphenols and was encapsulated in plain alginate particles, blend of alginate and whey proteins (8: 2) and in the same combination with chitosan coating. The morphological characteristics, particle size, texture, encapsulation efficiency and release from the obtained hydrogel and dried particles was examined. The results revealed that the use of whey proteins in combination with alginate ensures improvement of encapsulation parameters (particle size, encapsulation efficiency, release time prolongation) in relation to the plain alginate particles. Alginate-protein particles with chitosan coating was proved as the optimal delivery formulation of green tea bioactive compounds,since it exhibited 89.2% encapsulation efficiency of total polyphenols and sustained release of these compounds in water up to 120 minutes.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:159:622402
Study programmeTitle: Food Technology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka prehrambene tehnologije)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2017-04-26 13:33:25