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Article

Study of Some Components of the Unsaponifiable Fraction in the Skin of Grapes

L. Dagna, G. Gasparini, M. L. Icardi, E. Sesia
Am J Enol Vitic.  1982  33: 201-206  ; DOI: 10.5344/ajev.1982.33.4.201
L. Dagna
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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G. Gasparini
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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M. L. Icardi
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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E. Sesia
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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Abstract

Fourteen varieties of grapes characteristic of the Piedmont region were analyzed. The dried skins were first Soxhlet extracted with chloroform and the unsaponifiable fraction was separated on TLC.

Quantitative gas chromatographic analysis of the major fractions was performed. In the sterolic fraction, the following compounds were identified: β-Sitosterol, campesterol and stigmasterol. Among the triterpenoids, the presence of erytrodiol was observed plus a compound not yet mentioned in viticulture literature. That compound, identified through IR, GC/MS analysis and reactions characteristic of the carbonyl group, presents a structure analogous to oleanoic acid with the aldehydic group in Position 17.

From this data, significant differences were observed, both from a qualitative and a quantitative point view, in the varieties possessing distinct aromatic characteristics: Brachetto, Malvasia, and Moscato.

  • Received November 1981.
  • Revision received March 1982.
  • Accepted March 1982.
  • Published online January 1982
  • Copyright 1982 by the American Society for Enology and Viticulture

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You have accessRestricted access
Study of Some Components of the Unsaponifiable Fraction in the Skin of Grapes
L. Dagna, G. Gasparini, M. L. Icardi, E. Sesia
Am J Enol Vitic.  1982  33: 201-206  ; DOI: 10.5344/ajev.1982.33.4.201
L. Dagna
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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G. Gasparini
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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M. L. Icardi
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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E. Sesia
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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Study of Some Components of the Unsaponifiable Fraction in the Skin of Grapes
L. Dagna, G. Gasparini, M. L. Icardi, E. Sesia
Am J Enol Vitic.  1982  33: 201-206  ; DOI: 10.5344/ajev.1982.33.4.201
L. Dagna
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
  • Find this author on Google Scholar
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G. Gasparini
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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M. L. Icardi
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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E. Sesia
Laboratorio Chimico di Sanità Pubblica, 14100 Asti, Italy.
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