Status dušika i magnezija u jabukama na tržištu grada Zagreba

master's thesis

• Title (english): Status of nitrogen and magnesium in apples on the city of Zagreb market
• Author: Karlo Milak
• Mentor: Marko Petek (mentor)
• Committee member: Marko Petek (predsjednik povjerenstva)
• Committee member: Goran Fruk (član povjerenstva)
• Committee member: Tomislav Karažija (član povjerenstva)
• Granter: University of Zagreb; Faculty of Agriculture; (Department of Plant Nutrition); Zagreb
• Defense date and country: 2024-06-20, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Agronomy

Abstract

Jabuka (Malus domestica) je kontinentalna voćka čiji plodovi dozrijevaju od najranijeg ljeta do zime. U svijetu je poznato više od 6 000 sorti. Pripada porodici ruža (Rosaceae). U Hrvatskoj se smatra važnom kulturom jer zauzima 22 % površina pod voćem. Kao namirnica preporuča se uključiti u svakodnevnu prehranu zbog izuzetno velike količine nutrijenata. Važnost ovog istraživanja je davanje informacije potrošačima u kojem kanalu prodaje mogu pronaći jabuke s najviše minerala, a cilj je odrediti količinu dušika i magnezija u jabukama na tržištu Grada Zagreba, te izračunati koji postotak dnevnih potreba za dušikom i magnezijem ispitivani uzorci zadovoljavaju. Hipoteza rada je da će količina dušika i magnezija biti veća u jabukama iz trgovina ekološkim proizvodima, nego iz trgovačkih lanaca i na tržnicama. Uzorkovanje plodova jabuka provedeno je 23. listopada 2023. godine u gradu Zagrebu na tri tržnice, u tri trgovačka, te u tri trgovine ekološkim proizvodima. Uzorkovanje je provedeno u triplikatu. Rezultati pokazuju da su najveće količine dušika (0,42 % N) u suhoj tvari utvrđene u jabukama iz trgovačkih lanaca, dok su za magnezij dobiveni gotovo isti rezultati (0,03 % Mg u suhoj tvari) za sve kanale prodaje. Najveća količina dušika u svježoj tvari (69,12 mg N/100 g svježe tvari) utvrđena je u uzorcima jabuka sa tržnica, dok je kod magnezija nešto veća količina (5,77 mg Mg/100 g svježe tvari) utvrđena u trgovinama ekološkim proizvodima. Jabuka je namirnica koja sadrži male količine dušika i magnezija, te takve količine ne odgovaraju dnevnim potrebama koje se preporučuju ljudima za unos u organizam, ali unatoč tome postoje mnoge druge dobrobiti zbog kojih se preporučuje njena svakodnevna konzumacija.

Abstract (english)

The apple (Malus domestica) is a continental fruit tree whose fruit ripens from early summer to winter. More than 6000 varieties are known worldwide. It belongs to the Rose family (Rosaceae). In Croatia, it is considered as an important crop as it covers 22 % of the fruit-growing area. As a food, it is recommended as part of the daily diet due to its extremely high nutrient content. The importance of this study is to provide consumers information on the sales channels where they can find apples with the highest mineral content, while the aim is determination the nitrogen and magnesium content of apples on the Zagreb market and calculation what percentage of the daily nitrogen and magnesium requirement is covered by the investigated samples. The hypothesis of the work is that the content of nitrogen and magnesium in apples from stores with organic products is higher than in apples from retail chains and markets. Sampling of apple fruits was carried out on October 23, 2023 in the city of Zagreb in three markets, three retail chains and three stores with organic products. The sampling was carried out in triplicate. The results show that the highest nitrogen content (0.42 % N in dry weight) were found in apples from retail chains, while almost the same results were obtained for magnesium (0.03 % Mg dry weight) in all sales channels. The highest nitrogen content (69,12 mg N/100 g in fresh weight) was found in apple samples from markets, while the magnesium content (5,77 mg Mg/100 g in fresh weight) was slightly higher in stores with organic products. The apple is a food that contains small amounts of nitrogen and magnesium, and these amounts do not correspond to the daily requirement recommended for absorption in the body, but nevertheless there are many other benefits that make its daily consumption recommendable.

• Keywords: makroelementi; Malus domestica; minerali; nutritvna vrijednost; voće
• Keywords (english): fruit; macroelements; Malus domestica; minerals; nutritional value
• Language: croatian
• URN:NBN: urn:nbn:hr:204:300668
• Study programme: Title: Agroecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/ magistra inženjer/inženjerka agroekologije (magistar/ magistra inženjer/inženjerka agroekologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to authenticated users
• Created on: 2024-07-12 06:33:00