Identification of selenohomolanthionine in selenium-enriched Japanese pungent radish

JOURNAL OF HEALTH SCIENCE

et al. 2010

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Although selenium (Se) is not an essential element in plants, Se metabolism in plants is remarkable, mainly for the purpose of phytoremediation and nutritional supplementation of Se. Brassica juncea (Indian mustard) is known as an Se accumulator. In addition to Indian mustard, unique Brassicaceae plants are consumed in Japan. Brassica rapa var. hakabura, commonly known as nozawana, and Brassica rapa var. peruviridis, commonly known as komatsuna, are typical Brassicaceae plants. In this study, we evaluated the Se-accumulating ability of these unique Brassicaceae plants. There were no significant differences in the Se concentrations in the roots and the leaves of the three Brassicaceae plants. However, nozawana most efficiently accumulated Se among the three Brassicaceae plants because it showed the most rapid growth, resulting in the highest biomass. Speciation revealed that the Se species accumulated in the three plants were identical. In addition, nozawana contained easily extractable essential minerals, such as iron, copper, and zinc. Potentialities of nozawana as a source of minerals and the phytoremediation of soil and water contaminated with Se were discussed.

Section: Speciation Of Se S and Metals In Extracts Of Three Brassicmentioning

confidence: 99%

Comparison of Selenium Metabolism in Three Brassicaceae Plants

Yawata

Oishi

JOURNAL OF HEALTH SCIENCE

et al. 2010

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“…'Yukibijin'). 42) SeHLan was also identified by HPLC-ESI-MS-MS. Consequently, some Se-accumulating plants accumulated Se as selenocystathionine or SeHLan. As mentioned later, methylated selenoamino acids, such as SeMet and MeSeCys, can be converted into volatile Se compounds to reduce Se accumulation in plants.…”

Section: Selenoamino Acids In Se-accumulating Plantsmentioning

confidence: 99%

“…Thus, HPLC-ICP-MS is practically useful for the screening and determination of column recovery and the monitoring of the purification efficiency of selenometabolites owing to its sensitivity and robustness. 38) As a complementary technique to HPLC-ICP-MS, electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI)-tandem mass spectrometry (MS-MS) have been used for the identification of unknown selenometabolites in yeast, [39][40][41] plant, 42) and animal samples. 43,44) The fact that Se produces a characteristic cluster of signals that reflect its isotopic pattern ( Se, 8.73%) has facilitated the scanning of Se-containing species by MS. As ESI is a softer technique than ICP, it can provide molecular information.…”

Section: Hyphenated Techniquementioning

confidence: 99%

Selenometabolomics Explored by Speciation

Ogra

Biological & Pharmaceutical Bulletin

2012

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Selenium (Se) belongs to the same group as sulfur in the periodic table but possesses certain chemical properties characteristic of a metal. It is an essential element in animals but becomes severely toxic when the amount ingested exceeds the required level. On the other hand, Se is not essential in plants although some plants are Se hyperaccumulators. Se changes into several chemical forms when metabolized. Thus, the identification of selenometabolites would enable us to formulate a metabolic chart of Se. Recently, speciation analysis by hyphenated techniques has contributed immensely to the study of selenometabolomes, i.e., the entirety of selenometabolites. Indeed, speciation has unveiled some unique selenometabolites in biological samples. The aim of this review is to present newly identified selenometabolites in animals and plants by speciation using hyphenated techniques and to delineate the perspectives of Se biology and toxicology from the viewpoint of speciation.

“…These plants accumulate large amounts of sulfur in the various forms of sulfurcontaining metabolite, such as isocyanate and thioamino acids (Lampe and Peterson 2002), and hence, may be also able to accumulate Se, which belongs to the same group as sulfur in the periodic table. Indeed, unique Se-containing amino acids, such as Se-methylselenocysteine, selenomethionine, methylselenomethionine selenonium, and selenohomolanthionine, have been identified in Brassicaceae family plants (Grant et al 2004;Ogra et al 2007;Yathavakilla et al 2005). In addition, thioamino acids present in large amounts are expected to be an accumulator of heavy metals, such as REEs, because of their ability to sequester heavy metals.…”

mentioning

confidence: 99%

Comparison in Accumulation of Lanthanide Elements Among Three Brassicaceae Plant Sprouts

Bull Environ Contam Toxicol

Awaya

Ogihara

et al. 2012

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Three kinds of sprouts in the Brassicaceae family of plants, namely, pink kale, radish and mustard were evaluated for the possibility of phytoremediation of lanthanides. The mustard sprout more efficiently accumulated lanthanides (e.g. 0.26 nmol La/g) than other Brassicaceae family plant sprouts (0.16 nmol La/g in the radish), however the radish sprout showed the fastest growth among three sprouts. Faster growth compensated for less efficiency in lanthanide accumulation (28 pmol La in the radish vs. 12 pmol La in the mustard) indicating that the radish is the most preferable sprout for the phytoremediation of lanthanides.