Zmiany zawartosci azotanow i azotynow w korzeniach marchwi podczas przechowywania w kopcu ziemnym

W korzeniach pięciu odmian marchwi przed zakopcowaniem i po otwarciu kopca po 6-miesięcznym przechowywaniu badano poziom azotanów i azotynów. Stwierdzono istotny spadek zawartości tych związków u wszystkich przebadanych odmian z wyjątkiem odmiany Koral, u której nastąpił istotny wzrost azotanów, a u odmiany Bercoro wzrost azotanów nie był istotny.

The aim of this study was the determine the nitrate and nitrite contents in edible parts of 5 varieties of carrot, before clamping and after uncovering, in fresh carrot and dry matter. The colorimetric methods of Griess with modified by Romminger and Stran were used. Dry matter was determined with a drier. Statistical significance of differences in the levels of the studied compounds was calculated by a two-ways analysis of variance. In the studied carrot before damping ave. 406,6 mg KNO3/kg and 4,1 mg NaNO2/kg of fresh product was found. These amounts considerably admissible values. After 6-month storage a statistically significant decrease in nitrate levels of Karlena, Perfekcja and Amager was found, in dry metter, whereas a statistically significant Increase in Koral variety, while no statitically significant difference in the nitrate level did not changes, was found in Bercoro variety. As concerns nitrites a statistically significant decrease was stated in all carrot varieties.