Mathematical evaluation of the amino acid and polyphenol content and antioxidant activities of fruits from different apricot cultivars

Abstract
Functional foods are of interest because of their significant effects on human health, which can be connected with the presence of some biologically important compounds. In this study, we carried out complex analysis of 239 apricot cultivars (Prunus armeniaca L.) cultivated in Lednice (climatic area T4), South Moravia, Czech Republic. Almost all previously published studies have focused only on analysis of certain parameters. However, we focused on detection both primary and secondary metabolites in a selection of apricot cultivars with respect to their biological activity. The contents of thirteen biogenic alpha-L-amino acids (arginine, asparagine, isoleucine, lysine, serine, threonine, valine, leucine, phenylalanine, tryptophan, tyrosine, proline and alanine) were determined using ion exchange chromatography with UV-Vis spectrometry detection. Profile of polyphenols, measured as content of ten polyphenols with significant antioxidant properties (gallic acid, procatechinic acid, p-aminobenzoic acid, chlorogenic acid, caffeic acid, vanillin, p-coumaric acid, rutin, ferrulic acid and quercetrin), was determined by high performance liquid chromatography with spectrometric/electrochemical detection. Moreover, content of total phenolics was determined spectrophotometrically using the Folin-Ciocalteu method. Antioxidant activity was determined using five independent spectrophotometric methods: DPPH assay, DMPD method, ABTS method, FRAP and Free Radicals methods. Considering the complexity of the obtained data, they were processed and correlated using bioinformatics techniques (cluster analysis, principal component analysis). The studied apricot cultivars were clustered according to their common biochemical properties, which has not been done before. The observed similarities and differences were discussed.
V předkládané studii jsme se zaměřili na vybrané chemické analýzy u 251 genotypů meruněk (Prunus armeniaca L.) pěstovaných na experimentálním genofondovém pracovišti Mendelovy univerzity v Brně, v České republice. Byl sledován obsah biogenních alfa-L-aminokyselin pomocí ionexové kapalinové chromatografie. Ke stanovení HPLC profilu jednotlivých genotypů bylo využito spektrofotometrického a elektrochemického detektoru v tandemu. Bylo monitorováno 10 polyfenolických sloučenin, které jsou zajímavé z hlediska jejich antioxidačních vlastností. Antioxidační aktivita byla, vzhledem k zajištění objektivnosti získaných výsledků a také ve snaze o komparaci jednotlivých technik, stanovena pomocí čtyř metod současně. Pomocí DPPH testu, metody DMPD, metody ABTS, metody FRAP a pomocí metody Free Radicals. Fotometricky jsme určily obsah bílkovin, mikro a makro elementů jako vápník, draslík, železo, měď, zinek a hořčík. Folin-Ciocalteuovou metodou na spektrofotometru stanoven obsah celkových polyfenolických sloučenin. Dále byly zjišťovány hodnoty pH, Total soluble solids and titratable acidity. Získané hodnoty z jednotlivých měření byly mezi genotypy porovnány a statisticky a bioinformaticky vyhodnoceny.
Description
Citation
MOLECULES. 2011, vol. 16, issue 9, p. 7428-7457.
https://www.mdpi.com/1420-3049/16/9/7428
Document type
Peer-reviewed
Document version
Published version
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Language of document
en
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Comittee
Date of acceptance
Defence
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Document licence
Creative Commons Attribution 3.0 Unported
http://creativecommons.org/licenses/by/3.0/
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