Dzelzs, kālija, kalcija satura noteikšana nātru (Urtica Dioica L.) tējās
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Latvijas Universitāte
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Ir aktuāli papildināt uzturu ar minerālvielām bagātām tējām, tāpēc šajā darbā tiks izvērtēts dzelzs, kālija un kalcija saturs lielo nātru lapu tējās. Tēju izcelsmes valstis: Latvija, Polija, Lietuva. Paraugu sagatavošanā izmantotas sausās un slapjās mineralizācijas metodes. Minēto elementu saturs noteikts ar spektrofotometru un liesmas fotometru. Analizētajos paraugos dzelzs saturs ir 28,5 - 40,9 mg/100g, kālija saturs - 2,1 – 3,4 g/100g, bet kalcija - 1,2 – 3,6 g/100g. Latvijā vāktajās tējās ir augstākais dzelzs, kālija un kalcija saturs starp analizētajām tējām.Vērojama tendence, ka tējās, kurās ir lielāks kalcija saturs, kālija saturs ir mazāks un otrādi.
ATSLĒGVĀRDI: URTICA DIOICA, NĀTRE, DZELZS, KĀLIJS, KALCIJS, SPEKTROFOTOMETRIJA, LIESMAS FOTOMETRIJA
Nowadays it is actual to supplement the diet with mineral-rich teas, so determination of iron’s, potassium’s, calcium’s content in stinging nettle leaf were performed. Origin countries of teas: Latvia, Poland, Lithuania. Samples were prepared by dry and wet mineralization methods. Mentioned elements’ content was determined by flame photometer and spectrophotometer. Analyzed samples contain 28,5 - 40,9 mg/100g iron, 2,1 - 3,4g/100g potassium and 1,2 - 3,6g/100g calcium. Between collected samples, teas that were collected in Lativa has the highest iron, potassium and calcium content. There is a tendency that teas that contain a higher content of calcium, has a lower content of potassium and vice versa. KEYWORDS: URTICA DIOICA, NETTLE, IRON, POTASSIUM, CALCIUM, SPECTROPHOTOMETRY, FLAME PHOTOMETRY
Nowadays it is actual to supplement the diet with mineral-rich teas, so determination of iron’s, potassium’s, calcium’s content in stinging nettle leaf were performed. Origin countries of teas: Latvia, Poland, Lithuania. Samples were prepared by dry and wet mineralization methods. Mentioned elements’ content was determined by flame photometer and spectrophotometer. Analyzed samples contain 28,5 - 40,9 mg/100g iron, 2,1 - 3,4g/100g potassium and 1,2 - 3,6g/100g calcium. Between collected samples, teas that were collected in Lativa has the highest iron, potassium and calcium content. There is a tendency that teas that contain a higher content of calcium, has a lower content of potassium and vice versa. KEYWORDS: URTICA DIOICA, NETTLE, IRON, POTASSIUM, CALCIUM, SPECTROPHOTOMETRY, FLAME PHOTOMETRY