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Synthesis of carotenoid-cysteine conjugates

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Zand A., Agócs A., Deli J., Nagy V.
Acta Biochimica Polonica
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2012
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vol. 59
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issue 1
149-150
EN
Isozeaxanthin under acidic conditions forms an allylic cation which reacts readily with thiol nucleophiles. With N-acetylcysteine as a nucleophile the products obtained are carotenoid-cysteine conjugates in which the amino acid moiety is attached to the carotenoid via sulphur in position 4. The water solubility of the products can be increased by deprotection of the amino group. The antioxidant activity of the products were examined on human liver cells under conditions of hydrogen-peroxide induced oxidative stress.
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Carotenoid composition and in vitro pharmacological activity of rose hips

52%
Horváth G., Molnár P., Radó-Turcsi E., Deli J., Kawase M., Satoh K., Tanaka T., Tani S., Sakagami H., Gyémánt N., Molnár J.
Acta Biochimica Polonica
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2012
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vol. 59
|
issue 1
129-132
EN
The aim of the present study was to compare carotenoid extracts of Rose hips (Rosa canina L.) with regard to their phytochemical profiles and their in vitro anti-Helicobacter pylori (H. pylori), cytotoxic, multidrug resistance (MDR) reversal and radical scavenging activity. Carotenoid composition was investigated in the different fractionation of rose hips, using extraction methods. Six main carotenoids - epimers of neochrome, lutein, zeaxanthin, rubixanthin, lycopene, β,β-carotene - were identified from Rose hips by their chromatographic behavior and UV-visible spectra, which is in accordance with other studies on carotenoids in this plant material. The active principles in the carotenoid extract might differ, depending upon the extraction procedures.
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