| Abstract | Poriluk (Allium ampeloprasum var. porrum) je dvogodišnja biljka iz porodice Amaryllidaceae.
Važna je povrtna kultura, a zbog svojih hranidbenih i zdravstvenih vrijednosti zastupljena je
na tržištu. Iako biljke sadrže manju količinu mikroelemenata od makroelemenata
mikroelementi (poput željeza, mangana, cinka i bakra) su neophodni i jednako važni u ishrani
bilja kao i makroelementi te njihov nedostatak značajno negativno utječe na rast i razvoj
biljke. Mikroelementi u biljci imaju važne i složene funkcije, a većina njih povezana je s
enzimatskim reakcijama jer imaju svojstvo primanja i otpuštanja elektrona. Pravilna ishrana
preduvjet je za normalno funkcioniranje organizma. Za ljude, kao i za biljke, mikroelementi
su jednako bitni za rast i razvoj organizma, koje u organizam unose konzumacijom hrane.
Kupovinom voća i povrća potrošačima nije poznat podatak o količini minerala u namirnici
koju kupuju i kasnije konzumiraju. Stoga je cilj ovog rada bio je utvrditi količinu
mikroelemenata u poriluku koji se nudi na tržištu. Uzorkovanje je provedeno na 9 prodajnih
mjesta u gradu Zagrebu: 3 tržnice, 3 trgovačka lanca i 3 trgovine ekološkim proizvodima.
Nakon sušenja i homogeniziranja uzoraka te razgradnje u mikrovalnoj peći s HNO3 i HClO4,
mikroelementi (Fe, Mn, Zn, Cu) su određeni atomskom apsorpcijskom spektrometrijom.
Suha tvar u poriluku kretala se od 8,38 do 9,97 %. Utvrđena količina mikroelemenata u suhoj
tvari (mg/kg ST) poriluka iznosila je 76,2-153,1 Fe, 12,9-16,2 Mn, 18,5-26,2 Zn te 5,4-7,1 Cu, a
u svježoj tvari (mg/100 g svježe tvari) 0,91-1,71 Fe, 0,14-0,20 Mn, 0,21-0,30 Zn te 0,06-0,08
Cu. Općenito gledano, najviše mikroelemenata utvrđeno je u poriluku uzorkovanom u
trgovačkim lancima. Uspoređujući preporučene dnevne potrebe za čovjeka i utvrđene
vrijednosti mikroelemenata, porilukom iz ovog istraživanja moguće je podmiriti 6,5-12,2 %
Fe, 7,0-10,0 % Mn, 2,1-3,0 % Zn te 6,0-8,0 % Cu od dnevnih potreba. |
| Abstract (english) | Leek (Allium ampeloprasum var. porrum) is a biannual plant belonging to the Amaryllidaceae
family. Leek is important vegetable crop, present in the market due to its nutritive and
health benefits. Althoguh plants contain lower amount of macroelements compare to
macroelements, microelements (such as iron, manganese, zinc and copper) are essential and
equally relevant for plant nutrition as macroelements. Therefore, the deficiency of
microelements has a significant negative impact on development and growth of the plant.
Microelements in plants have significant and complex functions, most of which are
connected to enzymatic reactions due to their ability to accept and release electrons. Proper
diet is a precondition for everyday functioning of an organism. As for plants, microelements
are equally essential for growth and development of human organism too, which are intaken
by food consumption. When purchasing fruits and vegetables, the average consumer is not
informed about the content of minerals found in the product they choose to consume.
Therefore, the aim of this research paper was to determine the content of microelements of
leek on the market. Sampling was conducted across nine purchase point in the city of
Zagreb, including three markets, three retail chains and three eco produce shops. Samples
were first dried, than homogenized which was followed by digestion in the microwave oven
with HNO3 and HClO4. Microelements (Fe, Mn, Zn, Cu) were determined by atomic
absorption spectrometry. Dry matter in leek ranged from 8.38 to 9.97%. The determined
leek microelements content in dry matter (mg/kg DW) ranged as follows 76.2-153.1 Fe, 12.9-
16.2 Mn, 18.5-26.2 Zn and 5.4-7.1 Cu, while in fresh matter (mg/100 g of fresh matter)
ranged as follows: 0.91-1.71 Fe, 0.14-0.20 Mn, 0,21-0,30 Zn and 0,06-0,08 Cu. Generaly, the
highest microelements content was determined in the leek sampled in retail chains.
Comparing the recommended daily intake for humans with determined values of
microelements, leek sampled in this research could satisfy 6.5-12.2% Fe, 7.0-10.0% Mn, 2.1-
3.0% Zn and 6.0-8.0% Cu of daily intake. |
