engleski

Distribution of volatile sulfur compounds and heavy metals in kohlrabi and leek

Volatile sulphur compounds and heavy metals were investigated in different parts of the two plants: kohlrabi (Brassica rupestris Raf. ssp. gongyloides (L.) Janch. ; Brassicaceae family) and leek (Allium porrum L. ; Amaryllidaceae family). Owing to the presence of sulphur, volatile sulphur compounds show particular physicochemical eatures and interact with a range of molecular and biological targets. The main volatiles in B. rupestris were found to be degradation products of glucosinolates: sinigrin (allyl isothiocyanate), glucotropaeolin (benzeneacetonitrile and benzyl isothiocyanate), gluconasturtiin (2-phenylethyl isothiocyanate), and glucoreucin (4- (methylsulfanyl)butyl isothiocyanate), as well as from degradation of S-methylcysteine sulfoxide commonly named methiin (dimethyl trisulfide and dimethyl tetrasulfide). On the other hand, the main volatiles in A. porrum were derived from S-cysteine sulfoxide degradation: methiin, propiin, and isoaliin (methyl propyl trisulfide, (E)-propenyl propyl trisulfide, dipropyl disulfide, (E)-propenyl propyl disulfide, dimethyl trisulfide, dipropyl trisulfide). Over 500 plants species that hyperaccumulate metals are reported in the literature, among which Brassicaceae has the largest number of taxa. A large number of metals that can be hyperaccumulated are also essential nutrients, thus food fortification and phytoremediation might be considered as two sides of the same coin. Therefore, concentrations of various heavy metals, such as Zn, Cd, Pb, and Cu have also been determined. The trend of metal concentration was found as follows: Zn>Cu>Pb>Cd. Generally, the obtained preliminary results show that the concentration of heavy metals in the B. rupestris is higher than in A. porrum although they were grown in the same soil.

Brassica rupestris ; Allium porrum ; glucosinolates ; cysteine sulfoxides ; heavy metals

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