Leakage of Dhurrin and p-Hydroxybenzaldehyde from Young Sorghum Shoots Immersed in Various Solvents.

Abstract:

:Spectral scanning was used to provide estimates of the leakage of the cyanogenic glucoside, dhurrin (p-hydroxy-[S]-mandelonitrile-beta-d-glucoside), and its metabolite, p-hydroxybenzaldehyde (p-HB), from young light-grown shoots of Atlas sorghum (Sorghum bicolor [L.] Moench) when these shoots were immersed in water, toluene, chloroform or mixtures of water and toluene or water and chloroform. Minimal leakage of dhurrin and virtually no leakage of p-HB occurred with water as the solvent. The 0.5% concentration (v/v) of both toluene and chloroform was more effective than either the 1.0 or 2.0% concentrations in effecting leakage of the two solutes. With either 0.5% toluene or 0.5% chloroform as the solvent, 80 to 90% of the total dhurrin was extracted from shoots in a 3-hour period. Breakdown of dhurrin during extraction was much more extensive with 0.5% chloroform than with 0.5% toluene. Some loss of p-HB occurred during 3- or 6-hour extractions in the water-organic solvent mixtures; spectral and chromatographic evidence suggested partial conversion of p-HB to p-hydroxybenzoic acid. With undiluted toluene or chloroform as solvents, extracts contained appreciable amounts of free p-HB but essentially no dhurrin. These solvents were less effective than the water-organic solvent mixtures in extracting the solutes from the shoot issue.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Haskins FA,Gorz HJ

doi

10.1104/pp.75.3.869

subject

Has Abstract

pub_date

1984-07-01 00:00:00

pages

869-72

issue

3

eissn

0032-0889

issn

1532-2548

journal_volume

75

pub_type

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