 IVES 9 IVES Conference Series 9 Macrowine 9 Macrowine 2021 9 Chemical diversity of 'special' wine styles: fortified wines, passito style, botrytized and ice wines, orange wines, sparkling wines 9 Guyot or pergola for dehydration of Rondinella grape

Guyot or pergola for dehydration of Rondinella grape

Abstract

AIM: Pergola veronese is the most important vine training system in Valpolicella area but Guyot in the last decades is diffusing. Rondinella is one of the three most important varieties to make Amarone wine. In this study we compared the response of Rondinella grape during postharvest dehydration from vines trained with Guyot or Pergola.

METHODS: Grapes were harvested at the same ripening stage but the grape production of Guyot and Pergola was quite different, higher in Pergola vines. Grape bunches were placed in commercial fruttaio and left to dehydrate with close-open system until reaching a weight loss of 30%. Samplings were done at 10, 20, and 30% weight loss. Berry juice enochemical analyses were performed with WineScanTM (Foss Italia) whereas the analyses of specific polyphenol compounds such as trans-resveratrol, quercetin-glucoside, and the monoglucoside anthocyanins were carried out by HPLC. Electronic nose was used to measure the juice headspace gas and GC/MS to analyze the specific VOCs (volatile organic compounds).

RESULTS: Not significant difference in the grape characteristics between the two samples were observed during dehydration; sugars increased at the same extent, about 30% in proportion with the weight loss. The acidity did not change and was similar between the two samples but malic acid initially decreased and then increased. FAN was much higher in Guyot sample at harvest and the difference was kept during dehydration, probably due to higher yield of Pergola. Guyot sample had a higher content in quercetin and monoglucoside anthocyanins while Pergola grapes had higher content in total polyphenols and total anthocyanins and specifically in trans-resveratrol and complexed anthocyanins. Electronic nose revealed a significant difference in grape must volatiles between the two samples which was validated by different concentration in VOCs.

CONCLUSIONS

Guyot provide grapes with high content of free anthocyanins and quercetin while Pergola grapes have high content in trans-resveratrol and total anthocyanins that increased greater in Pergola than in Guyot. A significant difference in VOCs were measured which was validated by electronic nose

DOI:

Publication date: September 15, 2021

Issue: Macrowine 2021

Type: Article

Authors

Fabio Mencarelli

DAFE, UNIVERSITY OF PISA, ITALY,GREGORIO SANTINI, DAFE, UNIVERSITY OF PISA, ITALY BRUNELLA CECCANTONI, SERENA FERRI, RAFFAELE CERRETA, ANDREA BELLINCONTRO, DIBAF, UNIVERSITY OF TUSCIA, VITERBO, ITALY MARGHERITA MODESTI, LIFE SCIENCE INSTITUTE, SCUOLA S.ANNA, PISA DANIELE ACCORDINI, CANTINA VALOPOLICELLA DI NEGRAR, NEGRAR (VR), ITALY

Contact the author

Keywords

grape dehydration, resveratrol, quercetin, training system

Citation

Development of a new commercial phenolic analysis method for red grapes

Grape phenolic content is an important quality factor that influences the appearance and mouthfeel of premium red wines.

Evaluation of state of vineyards and characterization of vineyard sites of the integrated area of Tokaj Kereskedőház ltd. in Tokaj region

The Tokaj Kereskedőház Ltd. is the only state owned winery in Hungary. The company is integrating grapes for wine production from 1100 hectares of vineyard, which consist of 3500 parcels with average size of 0,3 hectares, owned by about 500 families of the region. The vineyards are unevenly spread in total 27 village of Tokaj region.

Grapevine genotypes differ in xylem vessel occlusion after winter pruning

Grapevines are continually wounded throughout their cultivation especially during winter pruning. Grapevines respond to wounding by occluding xylem vessels with gels or tyloses to limit pathogen attack and dehydration of the tissues. Although the production of xylem vessel occlusions has been studied in grapevine, to date we have no knowledge of whether different genotypes respond differently. The objective of this study was to characterize the genetic variation in xylem vessel occulsions in five different scion genotypes pruned at different dates.

Sviluppo di una metodologia di tracciabilità e definizione dell’impronta petrochimica in suoli e vini della Sicilia occidentale nella piana di Marsala (TP)

I risultati delle ricerche condotte in un vigneto sperimentale di Marsala (TP), scelto per omogeneità di fattori bio-agronomici (età, tecniche colturali, potenzialità vegetativa e produttiva)

Towards understanding the mechanisms of resistance to grapevine Flavescence dorée

Flavescence dorée (FD) is a very serious grapevine disease, classified as quarantine in europe, where it appeared in the middle of the last century. It is associated with the presence of phytoplasmas, transmitted in the vineyard by a leafhopper of american origin, scaphoideus titanus. FD causes severe wine production losses and often leads to plant death. There are currently no alternative solutions to insecticide treatments against the vector and uprooting diseased vines.