Discriminating the Effects of Vineyard Management Practices on Grape and Wine Volatiles from Cabernet Franc and Merlot Grape Varieties Using Electronic Nose Systems

Simple item page
dc.contributor.authorDevarajan, Yamuna Swethaen
dc.contributor.committeechairMallikarjunan, Kumaren
dc.contributor.committeecochairZoecklein, Bruce W.en
dc.contributor.committeememberGrisso, Robert D.en
dc.contributor.committeememberO'Keefe, Sean F.en
dc.contributor.departmentBiological Systems Engineeringen
dc.date.accessioned2014-03-14T20:46:39Zen
dc.date.adate2009-10-14en
dc.date.available2014-03-14T20:46:39Zen
dc.date.issued2009-09-07en
dc.date.rdate2013-05-07en
dc.date.sdate2009-10-13en
dc.description.abstractVineyard management practices are known to affect fruit composition and resultant wines, in part, by altering fruit volatiles. Methods currently used to evaluate the impact of vineyard practices on grape/wine composition include measuring physico-chemistry indices and performing wine sensory analyses. These activities are both time-consuming and destructive. Two electronic nose (ENose) systems: a hand-held conducting polymer-based and a portable surface acoustic wave-based systems were investigated as grape monitoring tools. Vineyard treatments included the effect of canopy side (East vs. West and North vs. South), cluster thinning (unthinned, 1 cluster/shoot, and 1 & 2 cluster/shoot) and ethanol spray (5% v/v) on Cabernet franc, Merlot and both varieties respectively. ENose data were obtained in the field (over two growing seasons for canopy side and in 2008 for cluster thinning and ethanol spray) and laboratory (2007 for canopy side), across different sampling dates and compared with nine-grape/eight-wine chemistry assays, GC/MS (cluster thinning) and wine aroma sensory evaluations (triangular difference testing). ENose results demonstrated 100% significant differences between all Cabernet franc and Merlot treatments. Grape/wine chemistry indices, for both Cabernet franc and Merlot, did not differ among treatments (except ethanol treatment) across sampling dates or growing seasons and vineyard management practices. Wine aroma sensory evaluations demonstrated only limited differences (3 out of 8 comparisons: East vs. West, 1 cluster/shoot vs. 1 & 2 clusters/shoot and 1 cluster/shoot and 1 & 2 clusters/shoot). The high level of discrimination by ENose systems may provide opportunities to enhance the understanding of vineyard management activities.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-10132009-220429en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10132009-220429/en
dc.identifier.urihttp://hdl.handle.net/10919/35375en
dc.publisherVirginia Techen
dc.relation.haspartDevarajan_YS_T_2009_2_BSE.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgrapeen
dc.subjectelectronic noseen
dc.subjectvolatilesen
dc.subjectMerloten
dc.subjectCabernet francen
dc.subjectwineen
dc.titleDiscriminating the Effects of Vineyard Management Practices on Grape and Wine Volatiles from Cabernet Franc and Merlot Grape Varieties Using Electronic Nose Systemsen
dc.typeThesisen
thesis.degree.disciplineBiological Systems Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Devarajan_YS_T_2009_2_BSE.pdf
Size:
8.75 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses