COMPARISON OF THREE METHODOLOGIES TO IDENTIFY DRIVERS OF LIKING OF MILK DESSERTS
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1 COMPARISON OF THREE METHODOLOGIES TO IDENTIFY DRIVERS OF LIKING OF MILK DESSERTS Gastón Ares, Cecilia Barreiro, Ana Giménez, Adriana Gámbaro Sensory Evaluation Food Science and Technology Department School of Chemistry Universidad de la República Montevideo, Uruguay 1
2 INTRODUCTION Understanding how consumers perceive food products is critical for food companies. Food companies need information about which sensory characteristics consumers expect to find in the product, i.e. which sensory attributes drive consumer liking Preference mapping techniques have been widely used to answer this question 2
3 One of the limitations of these techniques is that they assume that consumers and trained assessors perceive the products in the same way An alternative could be to gather information about consumers perception of the product using open ended questions. ten Kleij & Musters (2003) allowed consumers to voluntarily write down comments after their evaluations. 3
4 OBJECTIVES Evaluate the use of an open-ended question to identify drivers of liking of milk desserts Compare results to those obtained using internal and external preference mapping techniques 4
5 MATERIALS AND METHODS Eight milk desserts with different texture and flavour characteristics were formulated following a L Taguchi design Milk desserts were prepared using powdered milk and tap water Five two-level variables were considered: Starch Carragenan Vanilla Sugar Milk fat concentration Sample Starch Vanilla Sugar Carragenan Fat I 4.2% 0.1% 8% 0% 3.2% II 4.2% 0.1% 12% 0.02% 0% III 4.2% 0.25% 8% 0.02% 0% IV 4.2% 0.25% 12% 0 3.2% V 5.2% 0.1% 8% 0 0% VI 5.2% 0.1% 12% 0.02% 3.2% VII 5.2% 0.25% 8% 0.02% 3.2% VIII 5.2% 0.25% 12% 0 0% 5
6 Trained assessors panel A panel of 8 assessors characterized the texture and flavour of the samples using Quantitative Descriptive Analysis The assessors evaluated the following attributes: Sweetness Milky flavour Vanilla flavour Thickness Creaminess Melting Density Stickiness Mouth coating Unstructured 10-cm-long scales anchored with nil and high were used to describe attribute intensity. 6
7 Consumer panel A consumer study was carried out with 80 consumers Consumers evaluated the overall acceptability of the desserts using a 9-point hedonic scale They were also asked to provide up to four words to describe each dessert Sample N How much do you like this milk dessert? Dislike extemely Neither like nor dislike Like extemely Mention up to 4 words you would use to describe this milk dessert 7
8 Data analysis Analysis of variance Principal component analysis of trained assessors data Internal preference mapping External preference mapping Analysis of open-ended question: Qualitative analysis of elicited terms Correspondence analysis 8
9 RESULTS Acceptability scores Sample I II III IV V VI VII VIII Mean acceptability score 4.7 b,c 5.2 b,c 4.0 d 5.7 b 4.4 c,d 6.9 a 6.6 a 4.1 d 9
10 Internal preference mapping RESULTS Drivers of liking: Creaminess Thickness Mouth-coating Stickiness Density Increasing liking 10
11 Principal component analysis of trained assessors data PC1 was mainly related to texture attributes PC2 was correlated to flavour attributes Samples were sorted into 4 groups 11
12 External preference mapping Consumers' acceptability 9,000 8,000 7,000 6,000 5,000 1,76 6 Drivers of liking: Creaminess Thickness Mouth-coating Stickiness 1,039 4,000-3,932-2,686-1,439 PC1-0,192 1,0 54 2,301 0,311-0,417-1,145 PC2-1,873 12
13 Open ended question Category Examples Frequency Delicious Delicious, I like it, Nice, Tasty 210 Thick Thick, consistent, viscous 138 Disgusting Disgusting, I don t like it 84 Creamy Creamy, Very creamy 84 Sweet Sweet, Very Sweet 84 Not very tasty Not very tasty, Not tasty enough 78 Milky flavour Milky, Milky flavour 76 Soft Soft 70 Not thick Not thick, Not thick enough, Runny 56 Airy Airy, With bubbles 42 Nice flavour Good flavour, Nice flavour 38 Awful flavour Awful flavour, Bad flavour 10 Responses to the open-ended question identified liked and disliked samples, as well as the sensory attributes responsible for consumers preferences 13
14 1,5 Airy 1,0 III 0,5 Disgusting Dimension 2 (30,64%) 0,0-0,5-1,0 Thick VII Creamy VI Delicious Nice flavor Drivers of liking: Creaminess Thickness Flavour Soft Sweet II VIII Not very tasty V Milky flavor IV I Drivers of disliking: Milky flavour Not thick enough Not very thick -1,5 Awful flavor -2,0-1,0-0,8-0,6-0,4-0,2 0,0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 Dimension 1 (49,05%) 14
15 CONCLUSIONS The use of an open-ended question asking consumers to describe the samples provided an interesting insight into consumers perception. This technique could be useful to identify terms for other methodologies. Further research is necessary to evaluate the applicability of this technique for the identification of drivers of liking of more complex food products. 15
16 ACKNOWLEDGMENTS Organizing Comitee of Sensometrics 2008 Sensory Science Scholarship Fund and GlaxoSmithKline Consumer Healthcare for the Rose Marie Pangborn Sensory Scholarship To the assessors and the consumers who participated in the study 16
17 THANK YOU VERY MUCH FOR YOUR KIND ATTENTION! 17
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