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We studied the effects of UV radiation on the degree of phosphatidylcholine (PC) liposome membrane oxidation in the presence of such toxic organometallic compounds (TOC) as diphenyltin dichloride (DPhT), triphenyltin chloride (TPhT), dibutyltin dichloride (DBT), tributyltin chloride (TBT), triphenyllead chloride (TPhL) and tributyllead chloride (TBL). PC liposome oxidation was also investigated in the presence of quercetin (Que) and equimolar mixtures of Que and TOC in order to determine the protective properties of this natural antioxidant with respect to liposome membrane oxidation induced by UV light. Concentration of the compounds studied was 10 µM. The degree of liposome oxidation was measured using the TBARS (Thiobarbitutric Reactive Substances) test. The sequence thus obtained of relative induction of PC oxidation due to TOC was as follows: TBT > TPhT = DBT > DPhT = TPhL > TBL. The results of studies with Que indicate its high efficacy in the antioxidative action of equimolar mixtures of Que and TOC. From our study it follows that quercetin forms complexes both with phenyl- and butyl- tin and lead compounds. A high antiradical (towards DPPH radical) activity of the associates with respect to the activity of quercetin alone was also found. This result can partly explain the antioxidative properties of Que in the studied solution, connected with their antiradical action and chelating posibility towards the organometallic compounds studied. A factor that differentiates the antioxidant activity of the complexes Que-TOC is probably their differentiated location in the liposome membrane bilayer. A factor that differentiates the antioxidant activity of the complexes Que-TOC is probably their differ­entiated location in the liposome membrane bilayer.
The results of epidemiological studies published in the 70s suggested that diets of certain Central European states might contain unique chemo- preventive components. We investigated the antioxidative properties of traditional foods such as sauerkraut or beet roots, typical for diets in Central Europe and less common in other parts of the world. Some of the foods tested displayed free radical scavenging activity comparable to green tea used as a positive control. Particularly effective in this regard were beet root concentrate, sauerkraut juice and fermented cucumbers. Additionally, comet assay showed that sauerkraut juice protected cultured HL-60 cells against oxidative DNA damage in a dose-dependent manner.
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