Toxicity and metabolism of exogenous α,β-unsaturated carbonyls in potato (Solanum tuberosum L.) tubers

J Agric Food Chem. 2012 Nov 7;60(44):11173-81. doi: 10.1021/jf303299n. Epub 2012 Oct 30.

Abstract

A group of aliphatic α,β-unsaturated carbonyl compounds was evaluated for their utility as inhibitors of sprout growth in stored potato tubers (Solanum tuberosum L.). Nondormant tubers were treated with vapors of six 8-10-carbon compounds of this chemistry. Subsequent sprout growth at 16 °C (95% relative humidity) over ca. 3 months in storage was suppressed by all compounds in a concentration-dependent manner. The volatile metabolites produced by sprout and associated tuber tissues following treatment with 3-octen-2-one, 3-nonen-2-one, and 3-decen-2-one were the corresponding alkyl ketones and alkyl secondary alcohols. In contrast, (E)-2-octenal, (E)-2-nonenal, and (E)-2-decenal were metabolized by two pathways: (1) parent compound to the corresponding alkyl aldehyde and then to the alkyl primary alcohol and (2) parent compound to the alkenyl primary alcohol. Residues of 3-nonen-2-one and (E)-2-nonenal and their metabolites were analyzed in whole tubers over a 28 day post-treatment period. The concentrations of the parent ketone and aldehyde declined rapidly following application, and the most persistent metabolites were 2-nonanol and (E)-2-nonen-1-ol, respectively. The sequence of reactions leading from the α,β-unsaturated carbonyls to the alcohols was determined by application of each of the 9-carbon compounds individually to tubers. In long-term efficacy studies, a single application of (E)-2-nonenal and 3-nonen-2-one to nondormant tubers terminated sprout growth and prevented regrowth for 2-3 months. A second application suppressed sprouting for at least 4-5 additional months. This efficacy, combined with rapid metabolism and low residue levels, makes the 8-10-carbon α,β-unsaturated ketones and aldehydes worth consideration for use as sprout inhibitors.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Ketones / metabolism*
  • Ketones / toxicity*
  • Solanum tuberosum / metabolism*

Substances

  • Ketones