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undergraduate thesis
Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)
Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. urn:nbn:hr:159:555137
Moslavac, Leonina
University of Zagreb
Faculty of Food Technology and Biotechnology
Department of Chemistry and Biochemistry
Laboratory for Analytical Chemistry

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

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Moslavac, L. (2017). Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis) (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:159:555137

Moslavac, Leonina. "Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. https://urn.nsk.hr/urn:nbn:hr:159:555137

Moslavac, Leonina. "Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)." Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, 2017. https://urn.nsk.hr/urn:nbn:hr:159:555137

Moslavac, L. (2017). 'Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)', Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, accessed 29 May 2024, https://urn.nsk.hr/urn:nbn:hr:159:555137

Moslavac L. Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis) [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Food Technology and Biotechnology; 2017 [cited 2024 May 29] Available at: https://urn.nsk.hr/urn:nbn:hr:159:555137

L. Moslavac, "Spektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)", Undergraduate thesis, University of Zagreb, Faculty of Food Technology and Biotechnology, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:159:555137

Metadata
TitleSpektrofotometrijsko određivanje polifenola u etanolnim ekstraktima ružmarina (Rosmarinus officinalis)
Title (english)Spectrophotometric determination of polyphenols from ethanolic extracts of rosemary (Rosmarinus officinalis)
AuthorLeonina Moslavac
MentorAntonela Ninčević Grassino (mentor)
GranterUniversity of Zagreb
Faculty of Food Technology and Biotechnology
(Department of Chemistry and Biochemistry)
(Laboratory for Analytical Chemistry)
Zagreb
Defense date and country2017-09-08, Croatia
Scientific / art field,
discipline and subdiscipline		BIOTECHNICAL SCIENCES
Biotechnology
Abstract
Mali broj znanstvenih radova je pokazao da polifenoli kao aktivne komponente biljnog materijala, ključne za održavanje ravnoteže ljudskog organizma, osim antioksidacijskih posjeduju i antikorozijske osobine. Zbog izražene sposobnosti adsorpcije na metale i metalne legure, zauzimaju značajno mjesto pri ispitivanju antikorozijskog djelovanja. U ovom radu pripravljeni su etanolni (30 i 70 %, v/v) ekstrakti osušenih i usitnjenih listova ružmarina, primjenom ultrazvuka visokog intenziteta i refluksiranja. Procesni parametri primjenjeni kod estrakcije ultrazvukom bili su vrijeme od 3, 6 i 9 min i amplituda od 60, 80 i 100 % te vrijeme ekstrakcije od 1,5 i 3 h kod metode refluksiranja. Maseni udio ukupnih fenola i flavonoida u pripravljenim ekstraktima određen je UV/Vis spektrofotometrijskim testom. Ekstrakti s najvećim udjelima polifenola, dobiveni upotrebom 70 %-tnog etanola, pri vremenu ekstrakcije od 9 min i 100 %-tnoj amplitudi (optimalni parametri) koristit će se u njihovim daljnjim ispitivanjima kao antikorozijskih supstancija.
Abstract (english)
A few scientific papers have shown that polyphenols as active components of plant materials relevant for maintaining balance in human organism, besides antioxidants, also possess anticorrosive properties. Due to its capability of adsorption on metals and metal alloys, they occupied important place in investigations of anticorrosion activity. In this paper, ethanolic (30 and 70 %, v/v) extracts of dried and milled rosemary leaves are prepared by application of high intensity ultrasound and refluxing methods. Process parameters applied for ultrasound extraction were time of 3, 6, 9 min and amplitude of 60, 80 and 100 %, and extraction time of 1,5 and 3 h for reflux method. Mass fractions of total phenols and flavonoides are determined by UV/Vis spectrophotometric test. Extracts with the highest mass fractions of polyphenols, obtained by 70 % ethanol at extraction time of 9 min and 100 % amplitude (optimal conditions) will be used for theirs further examination as anticorrosive substance.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:159:555137
Study programmeTitle: Biotechnology
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka biotehnologije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2017-09-13 12:55:54