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doc. Ing. Branislav Gálik, PhD.
Identification number: 1595
University e-mail: branislav.galik [at] uniag.sk
 
associate professor CSc./PhD. - Department of Animal Nutrition (FAaFR)
Chief official - Department of Animal Nutrition (FAaFR)

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Basic information

Basic information about a final thesis

Type of thesis: Diploma thesis
Thesis title:Nitrate analysis in vegetables
Written by (author): Ing. Anna Zakuciová
Department: Department of Animal Nutrition (FAaFR)
Thesis supervisor: doc. Ing. Branislav Gálik, PhD.
Opponent:doc. Ing. Marta Habánová, PhD.
Final thesis progress:Final thesis was successfully defended.


Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:English

Slovak        English

Title of the thesis:Nitrate analysis in vegetables
Summary:The goal of workshop was analysis of nitrates levels in selected vegetables. carrot (Daucus carota), radish (Raphanus sativus), lettuce (Lactuca sativa var. capitata) and spinach (Spinacia oleracea). We homogenized, filtered and cooled off selected samples in an laboratory conditions. After that we set the level of NO3 through pH measurement using nitrate ion selected electrode (ISE) in vegetables coming from mass production.We compared the results with levels of Slovak nutritional code, which offered different nitrate toleration levels in selected vegetables. Carrot's maximum level is 700 mg.kg-1, radish's 3 500, lettuce's (type iceberg) 2 500 and in spinach 3 000 mg.kg-1. Analysis of samples confirmed, that all selected vegetables were compliant with the criteria requirements of PK SR, although spinach only to a certain level. Carrot contained in everage 244,3 mg.kg-1, radish 2 558,3 mg.kg-1, iceberg 1 296,3 mg.kg-1 and spinach 2 647,1 mg NO3- . kg-1 of fresh matter. We also watched the change of nitrate levels while storing refrigerated during 5 days. Foudings as following: carrot's NO3 level decreased (by 178,9 mg.kg-1), even after 5 days (by 208,4 mg.kg-1). Radish's level of NO3 increased by 78,1 mg.kg-1 after 3 days, though till 5th day decreased by 164,6 mg.kg-1. Overall, decreased by (86,5 mg.kg-1). Iceberg levels recorded more extreme changes, where NO3 levels rapidly decreased by 779,3 mg.kg-1, on 5th day suddenly increased by 212,9 mg.kg-1. Overall levels decreased by 566,4 mg.kg-1. Similarly nitrate levels in spinach, decreased by 154 mg.kg-1, after 3 days, though within next 2 days increased by 588,5 mg.kg-1, which off final level reached 3081,6 mg NO3 . kg-1 which represents breaking maximum tolerated level and remains the only case not compliant with the criteria requirements of PK SR.
Key words:lettuce, spinach, nitrates, carrot, radish

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