- Structure-Activity Relationship Study on Isothiocyanates: Comparison of TRPA1-Activating Ability between Allyl Isothiocyanate and Specific Flavor Components of Wasabi, Horseradish, and White Mustard
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Allyl isothiocyanate (ITC) (4) is the main pungent component in wasabi, and it generates an acrid sensation by activating TRPA1. The flavor and pungency of ITCs vary depending on the compound. However, the differences in activity to activate TRPA1 between ITCs are not known except for a few compounds. To investigate the effect of carbon chain length and substituents of ITCs, the TRPA1-activiting ability of 16 ITCs was measured. Since most of the ITCs showed nearly equal TRPA1-activiting potency, the ITC moiety is likely the predominant contributor to their TRPA1-activating abilities, and contributions of other functional groups to their activities to activate TRPA1 are comparatively small. (Figure Presented).
- Terada, Yuko,Masuda, Hideki,Watanabe, Tatsuo
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p. 1937 - 1941
(2015/09/08)
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- Analysis and anti- helicobacter activity of sulforaphane and related compounds present in Broccoli (Brassica oleracea L.) sprouts
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A crude methanol extract prepared from fresh broccoli sprouts was extracted with hexane, chloroform, ethyl acetate, and butanol sequentially. Residual water fraction was obtained from the residual aqueous layer. The greatest inhibition zones (>5 cm) were noted for Helicobacter pylori strain by the chloroform extract, followed by the hexane extract (5.03 cm), the ethyl acetate extract (4.90 cm), the butanol extract (3.10 cm), and the crude methanol extract (2.80 cm), whereas the residual water fraction did not show any inhibition zone. Including sulforaphane, five sulforaphane-related compounds were positively identified in the chloroform extract, of which 5- methylsulfinylpentylnitrile was found in the greatest concentration (475.7 mg/kg of fresh sprouts), followed by sulforaphane (222.6 mg/kg) and 4-methylsulfinylbutylnitrile (63.0 mg/kg). Among 18 sulforaphane and related compounds synthesized (6 amines, 6 isothiocyanates, and 6 nitriles), 2 amines, 6 isothiocyanates, and 1 nitrile exhibited >5 cm inhibitory zones for H. pylori strain. The results indicate that broccoli sprouts can be an excellent food source for medicinal substances.
- Moon, Joon-Kwan,Kim, Jun-Ran,Ahn, Young-Joon,Shibamoto, Takayuki
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p. 6672 - 6677
(2011/08/06)
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- BIOTRANSFORMATION OF ORGANIC SULFIDES. PART 7. FORMATION OF CHIRAL ISOTHIOCYANATO SULFOXIDES AND RELATED COMPOUNDS BY MICROBIAL BIOTRANSFORMATION
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The fungi Helminthosporium species NRRL 4671 and Mortierella isabellina ATCC 42613 have been used for the biotransformation of a series of isothiocyanatoalkyl methyl sulfides and their synthetic precursors, ω-(methylthio)alkylphthalimides.H. species gave predominantly (S) sulfoxides in all cases; M. isabellina gave (R) isothiocyanatoalkyl methyl sulfoxides, but in the case of two ω-(methylthio)alkylphthalimides substantial conversion of sulfoxide to sulfone resulted in the isolation of the former with predominant (S) configuration.A correction is made of the previously reported configurations of two biotransformation products (Tetrahedron: Asymmetry, 1994, 5, 1129).
- Holland, Herbert L.,Brown, Frances M.,Larsen, Brett G.,Zabic, Mirjana
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p. 1569 - 1574
(2007/10/02)
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