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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 77, No. 3, 2017, pp. 234-242
Bioline Code: cj17029
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 77, No. 3, 2017, pp. 234-242

 en Aroma characterization of grape juice enriched with grapevine by-products using thermomaceration
Martínez, Rafael; Valderrama, Natalia; Moreno, Juan & Bruijn, Johannes de

Abstract

The need to reuse grapevine ( Vitis vinifera check for this species in other resources L.) by-products avoiding negative environmental impact demands the search for new valorization methods like thermomaceration. The combination of grapevine by-products and grape must may be an alternative to get hold of additional aroma. The objective of this study was to assess the aroma potential of grape pomace, grapevine leaves and canes for País (PA) and Lachryma Christi (LC) cultivars to enrich grape must. Fifty aroma compounds were identified in the samples using stir bar sorptive extraction followed by thermal desorption, gas chromatography and mass spectrometry. ‘País’ must showed high contents of esters with a characteristic fruity odor, while benzenoids prevail in LC must giving a phenolic, balsamic odor. Thermomaceration increased contents of 13 free and bound volatile compounds, as well as new compounds (isoeugenol, phenol, vanillin and 2-ethyl hexanol) appeared in enriched juice (EJ). Cluster analysis showed differences among PA, LC and EJ samples. Principal component analysis was successfully applied to discriminate grape juice samples (p < 0.05) being D-limonene, 5-hydroxymethyl-2-furfural and hexadecanoic acid the compounds that contributed most to the differentiation and increase of free and hydrolyzed aroma compounds after thermomaceration. Both grape-grapevine by-products and juice processing conditions affected the generation and increase of free and bound aroma compounds after thermomaceration of grape must.

Keywords
Aroma compounds; aroma enrichment; chemometrics; grape must; thermomaceration; Vitis vinifera.

 
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