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Chenin blanc Wine Research (2010-2012)
Chenin blanc Conference, Cape Town,
24 September 2012
Hélène Nieuwoudt
Stellenbosch University South Africa
Presentation Overview
• Wine Science today
• Context / background
• Focus on Chenin - challenges
• How can research help
• Research results and conclusions
• Challenging some beliefs
• Future research directions
Sensory Consumer
intrinsic taste smell
perceptions psychology
Chemistry
grape fermentation maturation
viticulture winemaking
wine style identity
choice attitude towards
Today, wine science is about….
consumers sensory attributes
Relate and interpret
Relate and interpret
chemical measurements
WINE SCIENCE AT SU .....
Our network
• Several disciplines involved
• Stellenbosch university
• Our international collaborators:
– ConsumerCheck project
• Norway, Italy, Australia, SA, Netherlands
– Consumer perception
• France, USA
Chenin blanc team @ SU 2010-2012)
International ConsumerCheck project Started July 2009
• Program leader: Tormod Næs, Nofima Mat, Norway
• Four year project financed by National Science Foundation (NFR) and Norwegian food industries
• International collaboration (separate funding) – South Africa (Univ. Stellenbosch) – Australia (CSIRO) – Italy (Univ. Macerata) – Denmark (Univ. Copenhagen) – The Netherlands (Logic8)
Focus on Chenin blanc
• Why Chenin?
• Interesting diversity in styles/features
• Industry and research challenge
consumers sensory attributes
Relate and interpret
SA Chenin blanc wine style research – 70 cellars participating
Relate and interpret
chemical measurements
WINE SCIENCE AND SA CHENIN ..... OUTPUTS 2010-2012
database ~170 wines
database ~70
wines
perceptions knowledge liking
consumers sensory attributes
Relate and interpret
SA Chenin blanc wine style research – 70 cellars participating
Relate and interpret
chemical measurements
WINE SCIENCE AND SA CHENIN .....
database ~170 wines
For today’s presentation…..
Challenges specific to sensory and
consumer aspects
– Lack of objective data
– Technology platforms to be developed
– Information extracted
Questions
• Q 1 How can research assist the decision making consumers face in retail and restaurants?
• Q2 How can research identifying the core information ?
• Q3 How can research add value in identifying opportunities and translating core information
Consumer-perception analysis
Question: What is the consumers’ knowledge level and experience of Chenin blanc wine styles?
• Survey: – 6 Open-end questions Associative group analysis
technique (Szalay, 1970) – “When xxx is mentioned, what comes to mind?”
Cultivar, Chenin blanc, bush vines, NLH, SLH wines
• Two wine shows: – JHB Wine Fair 2010 (122 consumers) – Robertson Wine Fair 2010 (152 consumers)
• 5261 responses captured, categorised and scored
Challenge 1 Consumers knowledge & perceptions
Robertson Wine Fair JHB Wine Fair JHB Wine Fair Robertson Wine Fair
Chenin blanc wine styles Bush Vines
W 1 (RRunw)
W 2 (RRunw)
W 3 (RRunw)
W 4 (FF)
W 5 (FF)W 6 (FF)
W 7 (FF)
W 8 (RRw)
W 9 (RRw)
W 10 (RRw)
W 11 (RRw)
-0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4
PC1(26.7%)
-0.5
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
PC
2(1
3.9
%) W 1 (RRunw)
W 2 (RRunw)
W 3 (RRunw)
W 4 (FF)
W 5 (FF)W 6 (FF)
W 7 (FF)
W 8 (RRw)
W 9 (RRw)
W 10 (RRw)
W 11 (RRw)
Group 2 Group 3
Group 1
Wooded Unwooded
UNINSTRUCTED SORTING
?
?
W1 (RRunw)
W2 (RRunw)
W3 (RRunw)
W4 (FF)
W5 (FF)
W6 (FF)
W7 (FF)
W8 (RRw)
W9 (RRw)
W10 (RRw)
W11 (RRw)
-0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5
PC1(37.5%)
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
PC
2(1
7.4
%)
W1 (RRunw)
W2 (RRunw)
W3 (RRunw)
W4 (FF)
W5 (FF)
W6 (FF)
W7 (FF)
W8 (RRw)
W9 (RRw)
W10 (RRw)
W11 (RRw)
Group 3
Group 1
Group 2
Wooded Unwooded
INSTRUCTED SORTING
?
?
Challenge 2 Consumers’ style identification
W1W2
W3W4
W5W6
W7W8
W9W10
W11FF
RRunwRRw
Wines
4.8
5.0
5.2
5.4
5.6
5.8
6.0
6.2
6.4
6.6
6.8
7.0
7.2
Pre
fere
nce
scor
e
a
aa
bbb b
b bbb b b
b
How does knowledge of CB wine style CONCEPTS influence wine preferences?
Blind wine tasting
Informed wine
style tasting
0
5
10
15
20
25
30
35
A_TROPICAL
A_CITRUS
A_STONE FRUIT
A_RICH FRUIT
A_FLORAL
A_SWEET ASSOCIATED
A_VEGETATIVE
A_WOODY
A_SPICY
F_FRESH FRUITY
F_RIPE/COOKED FRUIT
F_VEGETATIVE
F_WOOD
T_SWEET
T_ACIDIC
M_ASTRINGENCY
Challenge 3 Sensory attributes: a complex story unfolds
How well do the three styles separate?
Scatterplot 2D
Final Configuration, dimension 1 vs. dimension 2
1 ff
2 ff
3 ff
4 ff
5 ff
6 ff
7 ff
8 rr
9 rr10 rr
11 rr
12 rr
13 rr
14 rr
15 w
16 w
17 w
18 w
19 w
20 w
21 w
-1.4 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Dimension 1
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
Dim
ensio
n 2
1 ff
2 ff
3 ff
4 ff
5 ff
6 ff
7 ff
8 rr
9 rr10 rr
11 rr
12 rr
13 rr
14 rr
15 w
16 w
17 w
18 w
19 w
20 w
21 w
FF RRUW RRW
What are the characteristic sensory profiles of Chenin blanc?
What are the descriptors generated for each style?
Fresh fruit Rich fruit
FF RRUW RRW
What are the descriptors generated for each style?
Challenging some beliefs
Does the consumer interact enough with the product?
Future work: effects of vinification techniques on Chenin character
Spontaneous vs inoculated…. Yeast population dynamics
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%A
fte
r cu
shin
g
Ju
ice
Beg
innin
g fe
rmen
tatio
n
Mid
dle
fe
rme
nta
tio
n
End
Ferm
enta
tion
Beg
innin
g fe
rmen
tatio
n
Mid
dle
fe
rme
nta
tio
n
End
Ferm
enta
tion
Must Spontaneous Inoculated
Dis
trib
uti
on
of
ye
as
t s
pe
cie
s
Saccharomyces cerevisiae
Metschnikowia pulcherrima
Zygosaccharomyces bailii
Candida zemplinina
Hanseniaspora vineae
Kodamaea ohmeri
Lachancea thermotolerans
Hanseniaspora uvarum
Candida sp.
Issatchenkia terricola
Hanseniaspora guilliermondii
Acknowledgements
• Post graduate students
• US Colleagues
• Chenin Blanc Association
• The QDA tasting panel
• Winemakers
• Private Cellars
• Winetech IWBT-W 10/01
• NRF
Investigating the correlation between chemical, sensory and consumer preferences of selected South African wines: Implementation of novel software IWBT-W 10/01