Research on stability of gomphrenin pigments influenced by Cu2+ ions

• Autorzy: Szmyr N. , Wybraniec S.

Identyfikatory

DOI

10.5604/01.3001.0012.1024

• Języki publikacji: EN

Abstrakty

EN

This paper concerns the results of dehydrogenation of gomphrenin pigments isolated from the purple flowers of Gomphrena globosa L. depending on pH and Cu2+ activity. Betalains are the plant dyes divided into red-violet betacyanins and yellow-orange betaxanthins. These compounds show prohealth properties proven by numerous studies [1]. Isolation of gomphrenins from the plant material was performed in the following stages: preparative extraction, filtration on a silica layer, preliminary purification and concentration on a bed of strong anion exchanger, preparative chromatographic fractionation and sample liofilization. The dehydrogenation studies of gomphrenin I and II were carried out in aqueous solutions (pH 3, 5 and 7) catalyzed by Cu2+ ions addition. The resulting product mixtures of dehydrogenated and decarboxylated gomphrenin derivatives were monitored by high-performance liquid chromatography with diode-array and mass spectrometric detection (LC-DAD-ESI-MS). Based on the results, it can be stated that decarboxylated and dehydrogenated gomphrenin II derivatives are more stable than gomphrenin I derivatives, presumably due to acylation of the glucose moiety. The highest levels of gomphrenin I derivatives were observed at pH 7, however, they were mainly monodecarboxylated ones. At pH 3, significant fraction was represented by tridecarboxylated and dehydrogenated derivatives. The lowest yield of the degradation products was indicated at pH 5.

Słowa kluczowe

EN

Gomphrena globosa; Betalains; Betacyanins; Gomphrenin; LC-DAD-ESI-MS; dehydrogenation; decarboxylation

PL

Gomfrena kulista; betalainy; betacyjaniny; gomphereniny; LC-DAD-ESI-MS; odwodnienie; dekarboksylacja

• Wydawca: Foundation for Young Scientists
• Czasopismo: Challenges of Modern Technology
• Rocznik: 2017
• Tom: Vol. 8, no. 1
• Strony: 13--18
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr., tab.

Twórcy

autor

Szmyr N.

• Cracow University of Technology, Department of Analytical Chemistry, Faculty of Chemical Engineering and Technology, Warszawska 24, 31-155 Cracow, Poland

autor

Wybraniec S.

• Cracow University of Technology, Department of Analytical Chemistry, Institute C-1, Faculty of Chemical Engineering and Technology, Warszawska 24, 31-155 Cracow, Poland

Bibliografia

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