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Biologically active phenolic compounds in selected vegetable in Allium genus.
STRÁNSKÁ, Lucie
This thesis deals with the content of polyphenolic compounds in vegetable of Allium species, which is mostly grown in the Czech Republic. It is Allium cepa, Allium x proliferum, Allium fistulosum, Allium tuberosum, Allium schoenoprasum, Allium porrum, Allium cepa var. agregatum. Polyphenols are micronutrients that have been identified in plants. These secondary metabolites involved the defence against pathogens or sunlight (Pandey, Rizvi, 2009). The studies that follow up these substances have been shown to play a significant role in the prevention of degenerative diseases such as cancer, cardiovascular diseases and neurodegenerative disease. The aim of this study was to determine the amount of myricetin, morin, luteolin, quercetin, apigenin and quercetin in selected types of vegetable grown in 2015 and 2016. The analysis was performed using high-performance liquid chromatography (HPLC). Samples were lyophilized in advance and ready for analysis. The analysis resulted in the chromatogram from which was then calculated content of selected material. Although the analysis should determine a total of six different compounds, only kaemferol and quercetin was specified because other substances in the sample weren ´t identified. In 2015 Allium x proliferum had the largest amount of quercetin (430? 10 mg/kg fresh weight) and Allium tuberosum contained the biggest kaemferol amount (170?105 mg/kg fresh weight). Analysis of the samples in 2016 has demonstrated different results. The most quercetin amount contained yellow onion with the value of 280?180 mg/kg fresh weight and the largest amount of kaemferol has again Allium tuberosum, 198?30 mg/kg fresh weight. These results were mainly influenced of climatic conditions, which in 2015 was a big drought and onion flourished. While 2016 year was a rather cooler and wetter.
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