Studies on biological methylation. Part XV. The formation of dimethyl selenide in mould cultures in presence of D- and L-methionine, or of thetins, all containing the 14CH3 group

Dransfield, Philip B.; Challenger, Frederick

doi:10.1039/jr9550001153

Cited by 15 publications

(4 citation statements)

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“…Volatile alkylselenium compounds are produced from inorganic selenium salts through a biomethylation process by various organisms . A variety of organisms, such as fungi, molds, and bacteria, are capable of producing volatile selenium compounds (DmSe, DmDSe, and (CH 3 ) 2 SeO 2 ) from inorganic or organic selenium compounds ,, . Until now, available literature has stated that the IV + state for selenium is HG active, but current observation has implied that in addition to the IV + oxidation state, the II - (TmSe, Semet, and Seet) oxidation state of selenium is also HG active and produces borohydride-active volatile Se compounds (dimethylselenide, dimethyldiselenide, diethyldiselenide, and ethylhydrogenselenide).…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, bioanalytical interest of selenium has grown dramatically − ,− Among these compounds are selenous acid, selenic acid, dimethylselenide, dimethyldiselenide, dimethyldiselenide sulfide, trimethylselenonium salts, selenoamino acids, selenium-containing carbohydrates, proteins, and nucleoside. Se compounds are widely used for dietary supplements in animals and humans .…”

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Identification of Volatile Selenium Compounds Produced in the Hydride Generation System from Organoselenium Compounds

et al. 2001

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We report a novel aqueous derivatization of selenomethionine (Semet), selenoethionine (Seet) and trimethylselenonium ion (TmSe) by NaBH4 and HCI to volatile selenium species, namely, diethyldiselenide (DeDSe), dimethyldiselenide (DMDSe), dimethylselenide (DmSe) and ethylhydrogenselenide (ESeH), in the hydride generation (HG) system. The volatile selenium compounds produced in the HG system were on-line trapped and concentrated in a U-tube that was immersed in the liquid nitrogen trap. The trapped volatile Se compounds were volatilized at 80 degrees C in a water bath, and 50-500 microL of volatile gas was injected into the GC/AED and GC/MS, respectively. It has been established that DmSe, DmDSe, and DeDSe are the predominant Se compounds that are produced in the HG system from TmSe, Semet, and Seet, respectively, followed by ESeH from Seet. Analytical methods previously employed have stated that these compounds are inactive in the HG system. Prior decomposition of Semet, Seet, and TmSe to selenous acid is essential before HG. To the best of our knowledge, current findings for the production and identification of volatile selenium compounds in the HG system are new and different from existing reports; hence, direct estimation of Semet, Seet, and TmSe is possible when coupling with a HG system using a suitable Se-specific detector.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Identification of Volatile Selenium Compounds Produced in the Hydride Generation System from Organoselenium Compounds

et al. 2001

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“…If this stimulation of fungal development by sulfate were indeed the result of selenium detoxication as a consequence of increased methyla-tion, then probably there should have been a dramatic difference in the amount of the methylated compound formed in the presence of 100 and 1,000 Mg of selenite/ml to account for the similar extents of growth. Fels and Cheldelin (7) similarly concluded that the protection against selenium toxicity afforded by methionine was not related to the methylation of the toxicant, although it is known that both Dand L-methionine can donate methyl groups to selenium (4).…”

Section: Discussionmentioning

confidence: 99%

Dimethylselenide and Dimethyltelluride Formation by a Strain of Penicillium

Fleming¹,

Alexander²

1972

Applied Microbiology

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“…However, the observation that losses of volatile selenium compounds can occur during the storage of seleniferous cereal grains (Moxon and Rhian 1938), together with the release of volatile selenium compounds by Astragalus species (Beath, Eppson, and Gilbert 1935;Lewis, Johnson, and Delwiche 1966), and by certain fungi (Dransfield and Challenger 1955), suggests that the capacity to produce volatile selenium compounds may be rather widespread throughout the plant kingdom. Further research is needed to clarify this point.…”

Section: Discussionmentioning

confidence: 99%

Collection and Partial Characterization of Volatile Selenium Compounds from Medicago Sativa L.

Evans¹,

Johnson²

1967

Aust. Jnl. Of Bio. Sci.

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SummaryTops and roots of Medicago 8ativa plants raised in culture solution to which 75Se·labelled selenite or selenate had been added were shown to release 0·5-3·0% of their total selenium in volatile form when dried at 70°C for 48 hr. The volatile selenium compounds were collected on activated charcoal.Extraction of the charcoal with various solvents showed that a large part of the total volatile selenium· containing material was soluble in water but insoluble in diethyl ether. The residual moiety was soluble in ether but insoluble or sparingly soluble in water.The water·soluble fraction was shown to contain two selenium compounds which could be separated by anion-exchange column chromatography. The same two water-soluble volatile compounds were found whether selenium was supplied to the plants as selenite or selenate and whether collected from oven-drying tops or roots. The same two compounds were also obtained from intact plants.The chromatographic method used to separate these compounds also separated inorganic selenite and selenate from them and from each other.

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Studies on biological methylation. Part XV. The formation of dimethyl selenide in mould cultures in presence of D- and L-methionine, or of thetins, all containing the 14CH3 group

Cited by 15 publications

References 0 publications

Identification of Volatile Selenium Compounds Produced in the Hydride Generation System from Organoselenium Compounds

Identification of Volatile Selenium Compounds Produced in the Hydride Generation System from Organoselenium Compounds

Dimethylselenide and Dimethyltelluride Formation by a Strain of Penicillium

Collection and Partial Characterization of Volatile Selenium Compounds from Medicago Sativa L.

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