Određivanje udjela mineralnih tvari u hrani za dojenčad

master's thesis

• Title (english): Determination of mineral content in infant formulas
• Author: Saša Ajredini
• Mentor: Mirjana Hruškar (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Food Quality Control); (Laboratory for Food Quality Control); Zagreb
• Defense date and country: 2013-02-08, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

Razvijena je i validirana jednostavna i brza F-AAS metoda za određivanje bakra, željeza, cinka i natrija te F-AES metoda za određivanje kalija u hrani za dojenčad. Razvijenom je metodom određen udjel navedenih mineralnih tvari, dok je udjel kalcija određen gravimetrijsko-volumetrijskom i fosfora kolorimetrijskom metodom u 14 uzoraka hrane za dojenčad. Udjel bakra iznosio je od 232 do 403 μg/100 g praha, željeza od 4,4 do 7,2 mg/100 g praha, cinka od 2,1 do 5,3 mg/100 g praha, natrija od 91 do 211 mg/100 g praha, kalija od 98 do 187 mg/100 g praha, kalcija od 376 do 543 mg/100 g praha i fosfora od 198 do 370 mg/100 g praha. Uočeno odstupanje izmjerenog od deklariranog udjela mineralnih tvari iznosilo je od - 76,95 do 23,45 %. Udjel kalija se u svim ispitivanim uzorcima nalazio značajno ispod, dok se udjel cinka u jednom uzorku nalazio neznatno ispod minimalnog udjela dopuštenog Pravilnikom.

Abstract (english)

A simple and rapid F-AAS method for copper, iron, zinc and sodium analysis and F-AES method for potassium analysis in infant formula was developed and validated. Additionaly, infant formula calcium and phosphorus content was determined by gravimetric-volumetric and colorimetric methods, respectively. Mineral content in the 14 analysed infant formula samples, expressed as content per 100 g of powder, ranged from 232 to 403 μg for copper, from 4.4 to 7.2 mg for iron, from 2.1 to 5.3 mg for zinc, from 91 to 211 mg for sodium, from 98 to 187 mg for potassium, from 376 to 543 mg for calcium and from 198 to 370 mg for phosphorus. The mineral content difference between obtained results and declared values on product labels ranged from - 76.95 to 23.45 %. Potassium content in all samples was significantly below while zinc content of one sample was slightly below minimal amounts required by national regulations.

• Keywords: F-AAS; F-AES; hrana za dojenčad; mineralne tvari; validacija
• Keywords (english): F-AAS; F-AES; infant formula; minerals; validation
• Language: croatian
• URN:NBN: urn:nbn:hr:159:739398
• Study programme: Title: Food Safety Management; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane (magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-04 12:19:47