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- W2083245461 abstract "Abstract [1-14C]acetate and [2-14C]acetate were incorporated into the β-diketones of barley spike epicuticular wax via the peduncle. Utilizing column chromatography with dry copper acetate, the β-diketones were isolated and the labeling pattern in the hentriacontan-14, 16-dione determined after its degradation. A modified iodoform procedure was used to give myristic and palmitic acids. Radio-gas chromatography was then performed on the products of chemical α-oxidation of the separated fatty acids. This procedure, in effect, gave the specific activity of every carbon atom of hentriacontan-14,16-dione except carbon-1 to carbon-5 (from myristic acid) and carbon-27 to carbon-31 (from palmitic acid) for each labeled substrate. The specific activity of carbon-15 was determined by an indirect method. On the basis of these data it is suggested that the hentriacontan-14,16-dione is synthesized from the carbon-31 end of the molecule by elongation as follows. C2 units are added, perhaps to a mixture of short chain precursors, to give a chain with 12 carbon atoms. This chain is then elongated to one with 16 carbon atoms so that the four added carbon atoms are uniformly labeled. Following this, the chain with 16 carbon atoms is elongated with C2 units to give the complete molecule. Possibly some change in mechanism occurs in this last elongation process when the chain is 22 carbon atoms long. Barley spike wax β-diketones contain about 2% nonacosan-13, 15-dione which seems to be synthesized in an analogous manner." @default.
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- W2083245461 date "1976-06-01" @default.
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- W2083245461 title "Biosynthesis of the β-diketones of barley spike epicuticular wax" @default.
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- W2083245461 doi "https://doi.org/10.1016/0003-9861(76)90390-8" @default.
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