Thesis (MSc)--Stellenbosch University, 2011 / ENGLISH ABSTRACT: South African Chenin blanc wine is characterised by its style diversity and has been receiving
more industry limelight over the past few years. Three dry Chenin blanc wine styles are
currently described by the wine industry as Fresh and Fruity (FF), Rich and Ripe unwooded
(RR-unwooded) and, Rich and Ripe wooded (RR-wooded). According to the South African wine
industry, however, consumers seem to be somewhat confused by these various Chenin blanc
wine styles, which have not yet been clearly defined and classified. During this study we
investigated the following perspectives of this wine style classification confusion:
Currently, no specified sensory method is being used to differentiate between wine styles of
a single wine cultivar, such as Chenin blanc. The sorting method can be used as a more cost
and time effective classification and profiling method than general quantitative descriptive
analysis (QDA). It was therefore investigated whether both uninstructed and instructed sorting,
with consumers and wine experts, can be used to classify and describe the Chenin blanc wine
styles similarly to QDA. The increase in young wine consumers, Generation Y, introduces new
wine marketing opportunities for the wine industry which need to be investigated. Young
consumers are not aware of the various Chenin blanc wine styles, which may influence their
wine preferences. The influence of wine style knowledge on these consumers’ wine style
preferences were investigated during blind and wine style informed preference test. Any
segmentation within this Generation Y group was also investigated with regards to their Chenin
blanc wine style preferences and/or exploratory data. The following scientific and industrial
findings were made:
QDA was successfully substituted by instructed and uninstructed sorting tasks. Although the
sorting tasks easily differentiated between wooded and unwooded wines, QDA differentiated
more successfully between the unwooded wines. Wine tasting experience did not significantly
influence the sorting results of the consumers versus the wine experts, but more experienced
panellists consistently used fewer descriptors than untrained consumers. All panellists sorted
products slightly better when they were provided with wine style sorting instructions. However,
there were no significant differences between the instructed and uninstructed sorting task
results, i.e. a wine style descriptor list did not improve panellists’ abilities to describe their sorted
wine groups.
South African Chenin blanc wines can definitely be divided into wooded and unwooded
wine styles, i.e. two wine style groups, but the unwooded Chenin blanc wine spectrum formed a
wine-style-continuum. This finding is apparent from both the sorting and QDA methods. The
unwooded continuum wines can further be differentiated from one another with the use of a
fresh-to-mature scale and/or a light-to-full body scale during QDA.
Generation Y wine consumers preferred all the Chenin blanc wine styles equally and
moderately during the blind tasting, but their knowledge of the wine style concepts significantly
increased their preferences for the wines during the informed wine style tasting. The cognitive
influence of wine style knowledge is therefore powerful in terms of influencing a consumer’s
wine preferences. Other interesting correlations were also made between Generation Y
consumers’ wine style preferences and their exploratory data. / AFRIKAANSE OPSOMMING: Suid-Afrikaanse Chenin blanc wyn word gekarakteriseer deur styl diversiteit en is die afgelope
paar jaar meer in die kollig. Drie droë Chenin blanc wynstyle word tans deur die wynbedryf
beskryf as: Vars en Vrugtig, Ryk en Ryp ongehout en, Ryk en Ryp gehout. Volgens die Suid-
Afrikaanse wynbedryf is daar heelwat verwarring is tussen hierdie Chenin blanc wynstyle weens
die feit dat hierdie wynstyle nog nie duidelik gedefinieer en geklassifiseer is nie. Tydens die
huidige studie het ons die volgende perspektiewe van hierdie wynstyl-verwarring ondersoek:
Huidiglik word daar geen gespesifiseerde sensoriese metode gebruik om te onderskei
tussen verskillende wynstyle van ’n enkele wyn kultivar, soos Chenin blanc, nie. Die
sorteringsmetode kan gebruik word, instede van kwantitatiewe beskrywende analise, as ’n meer
koste- en tyd-effektiewe produk klassifikasie en profileringsmetode. DIt was dus ondersoek of
beide geïnstrukteerde en ongeïnstrukteerde sorteringstake, met verbruikers en wynkundiges,
gebruik kan word om die verskeie Chenin blanc wynstyle kan profileer en klassifiseer soortgelyk
soos kwantitatiewe beskrywende analise. Die toename in jong verbruikers, Generasie Y, skep
nuwe wynbemarkingsgeleenthede wat ondersoek moet word. Jong verbruikers se
onbewustheid van die verskeidenheid Chenin blanc wynstyle mag hulle voorkeure vir hierdie
wyne beïnvloed. Die invloed van wynstyl kennis op hierdie jong verbruikers se wynstyl
voorkeure was ook ondersoek gedurende ’n blinde en ’n wynstyl-ingeligte voorkeur toets. Enige
segmentasie binne hierdie Generasie Y verbruikersgroep was ook ondersoek in verband met
hul Chenin blanc wynstyl voorkeure en/of verkennende data. Die volgende wetenskaplike en
industriële bevindings is gemaak:
Kwantitatiewe beskrywende analise kan suksesvol vervang word deur beide
geïnstrukteerde en ongeïnstrukteerde sorteringsmetodes. Alhoewel die sorteringsmetodes
maklik gebruik kon word om te onderskei tussen gehoute en ongehoute wyne, kan
kwantitatiewe beskrywende analise fyner onderskeid tref tussen die individuele ongehoute
wyne. Die wynproe-ervaringsvlak het geen invloed op die sorteringsresultate gehad nie, maar
meer ervare paneellede het konsekwent gebruik gemaak van minder beskrywende terme as
onopgeleide verbruikers wat baie meer en verskillende soorte terme gebruik het. Beide panele
het effens beter gesorteer wanneer hulle spesifieke wynstyl sorteringsinstruksies ontvang het.
Daar was egter geen beduidende verskille tussen die geïnstrukteerde en ongeïnstrukteerde
sorteringsresultate nie, wat daarop dui dat sorteringsinstruksies en ’n lys van wynstyl
beskrywings nie die paneellede se wyse van sortering verander het nie.
Suid-Afrikaanse Chenin blanc wyne kan definitief verdeel word in gehoute en ongehoute
wynstyle, d.w.s twee wynstyl groepe, maar die ongehoute Chenin blanc wyn spektrum vorm ’n
wynstyl-kontinuum. Laasgenoemde is bevind tydens beide die sorteringstake asook
kwantitatiewe beskrywende analise. Die ongehoute kontinuum wyne kan verder van mekaar
onderskei word met behulp van ‘n vars-tot-volryp en/of ‘n ligte-tot-volmond skaal tydens
kwantitatiewe beskrywende analise.
Alle jong wyn verbruikers het ewe veel van al die wynstyle gehou tydens die blinde wynstyl
voorkeur toets, maar tydens die wynstyl-ingeligte voorkeur toets het hulle voorkeure vir al die
wynstyle drasties verbeter. Die kognitiewe invloed van Chenin blanc wynstyl kennis kan dus lei
tot hoër voorkeure vir die wynstyle. Ander interessante korrelasies is ook bevind tussen hierdie
Generasie Y wyn verbruikersgroep se wynstyl voorkeure en hul verkennende data.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/18048 |
| Date | 12 1900 |
| Creators | Bester, Inneke |
| Contributors | Nieuwoudt, H. H., Muller, N., Stellenbosch University. Faculty of AgriSciences. Dept. of Viticulture and Oenology. Institute for Wine Biotechnology. |
| Publisher | Stellenbosch : Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Language | en_ZA |
| Detected Language | Unknown |
| Type | Thesis |
| Format | 155, 14 p. : ill. |
| Rights | Stellenbosch University |
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