| Abstract | Mandarina je biljna vrsta koja pripada skupini zimskog sezonskog voća. Zbog visokog sadržaja minerala i vitamina C vrlo je cijenjena i tražena voćna vrsta među kupcima. Međutim, potrošači prilikom kupnje nemaju informaciju o točnom mineralnom sastavu mandarine što bi im omogućilo jasniji uvid u samu kvalitetu proizvoda. Na tržištu grada Zagreba provedeno je istraživanje s ciljem utvrđivanja količine željeza i kalcija u mandarini te usporedbe dobivenih rezultata s obzirom na mjesto kupnje pojedinih uzoraka. Uzorkovanje mandarine provedeno je na 9 prodajnih mjesta u gradu Zagrebu: 3 tržnice, 3 trgovačka lanca i 3 trgovine ekološkim proizvodima. Mokrim spaljivanja s HNO3 i HClO4 dobiven je razgrađeni uzorak iz kojeg su kalcij i željezo određeni atomskom apsorpcijskom spektrometrijom. Količina suhe tvari u uzorcima mandarine kretala se u rasponu od 7,4 do 9,33 %. Količina željeza u suhoj tvari mandarine kretala se u rasponu od 15,8 do 29,3 mg Fe/kg, a količina kalcija od 0,20 do 0,31 % Ca. U svježoj se tvari količina željeza kretala u rasponu od 0,21 do 0,40 mg Fe/100 g, a kalcija od 21 do 42 mg Ca/100 g. Općenito je najveći postotak suhe tvari utvrđen u plodovima mandarina s tržnice (8,7 %), najveća količina željeza u suhoj tvari mandarina iz trgovačkih lanaca (25,6 mg Fe/kg) i najveći postotak kalcija u suhoj tvari također u mandarinama iz trgovačkih lanaca (0,27 %). Konzumacijom 100 g mandarina iz trgovačkih lanaca može se podmiriti 4,29 % dnevnih potreba za kalcijem i 2,36 % za željezom, s tržnica 3,38 % za kalcijem i 1,57 % za željezom, a konzumacijom 100 g mandarina iz trgovina ekološkim proizvodima može se podmiriti 3,34 % dnevnih potreba za kalcijem i 1,86 % za željezom. |
| Abstract (english) | Mandarin is a plant species that belongs to the group of winter seasonal fruits. Due to its high content of minerals and vitamin C, it is a highly valued and sought-after fruit among customers. However, at the time of purchase, consumers do not have complete information about the exact mineral composition of mandarins, which would give them a better insight into the quality of the product itself. This research was conducted in the Zagreb market to determine the iron and calcium content of mandarins and compare the results with the sales channels. Sampling of mandarins was performed at 9 points of sale in the city of Zagreb: 3 markets, 3 retail chains and 3 organic products shops. A decomposed sample was obtained by digestion with HNO3 and HClO4, from which calcium and iron were determined by atomic absorption spectrometry. The percentage of dry matter in the mandarin samples ranged from 7.4 to 9.33%. The iron content of the mandarin dry matter ranged from 15.8 to 29.3 mg Fe/kg, and the calcium content ranged from 0.20 to 0.31 % Ca. In the fresh matter, the iron content ranged from 0.21 to 0.40 mg Fe/100 g, and the calcium content ranged from 21 to 42 mg Ca/100 g. In general, the highest percentage of dry matter was found in mandarin fruits from the market (8.7%), the highest iron content in the dry matter of mandarins from retail chains (25.6 mg Fe/kg), and the highest calcium content in the dry matter was also found in mandarins from retail chains (0.27%). Consumption of 100 g of mandarins from retail chains can cover 4.29% of the daily requirement of calcium and 2.36% of iron, from markets 3.38% of calcium and 1.57% of iron, and consumption of 100 g of mandarins from organic products shops can cover 3.34% of the daily requirement of calcium and 1.86% of iron. |
