how to conduct sensory evalution

8/2/2019 How to Conduct Sensory Evalution

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How to conductSensory

EvaluationSherin Lee


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Why use SensoryEvaluation?Sensory evaluation can be usedto:

Evaluate a range of existing food

products Analyse test sample for

improvements

Gauge consumer response to aproduct

Check that a final product meetsits desired specification.


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How to perform Sensory Evaluation?1) Decide on the typeof test you want toperform.

-Preference test - asks whetherpeople like or dislike a product, e.g.hedonic scale

-Discrimination test - asks peopleto describe a particular attribute ofa product, e.g. paired comparison

test.


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Types of Test

Preference Tests-These supply information about

people's likes and dislikes of a product.They are not intended to evaluate specific

characteristics, such as crunchiness orsmoothness. They are subjective testsand include pair comparison, hedonic andscoring.

Discrimination Tests

-These aim to evaluate specific attributes,i.e. characteristics of products (crunchiness).

They are objective tests and include pair

comparison, duo trio and triangle.


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Hedonic Scale

1. Prepare the food samples.

2. Ask each person to taste each

sample in turn and tick a box, from'1 Dislike Very Much' to '5. LikeVery Much' to indicate theirpreference. Use the word file

below to help.

3. The person may also wish to makeremarks about the products

appearance, taste, odour and


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Hedonic Scale


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Scoring Test

1. Samples are scored on a scale,between like and dislike.

2.

Allow people to evaluate samplesand score (place) in order ofpreference.

3.

Record their responses.


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Scoring Test


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Paired Comparison Test(Preference)

1. Prepare two samples of the foodproduct you wish to test.

1. Ask each taster which productthey prefer.

1. Record the response from thetasters.


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Paired Comparison Test(Preference)


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Paired Comparison Test(Discrimination)

1. Prepare two samples of the foodproduct you wish to test.

1. Compare one attribute, e.g.which one is smoother?

1. Record the response from the

tasters.


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Paired Comparison Test(Discrimination)


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Triangle Test

1. Prepare three samples, two ofwhich are the same.

2. Arrange the samples in atriangle.

3. Decide which of the samples isthe odd one out.


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Triangle Test


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Duo Trio Test

1. Prepare three samples, two ofwhich are the same.

2. Using one of the two identicalsamples as a control, decidewhich of the other samples is the

same as the control.

3. Record the tasters responses.


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Duo Trio Test


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Ranking Test

1. Decide on the attribute to beranked, e.g. crunchiness.

1. Allow people to evaluate samplesand place them in rank order.

1. Record the responses.


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Ranking Test


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Star Diagram/Chart

This type of test allows a singlefood products, or range of food

products, intensity of its sensory

attributes to be recorded. They areNOT intended to model generalattributes such as 'nutrition', 'cost' or

'appearance', as they are morecomplex are better dealt with in otherways.


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how to conduct sensory evalution

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