Sensory evaluation Flashcards
sensory evaulation
the assessment by the human senses of all the qualities of a food product that are perceived
Sensory properties often determine the acceptance or rejection of foods
All 5 senses are used: sight, smell, touch, taste and sound
what is the effect of running tests?
can incres the cost of the product
____ + ____ = flavour
smell + taste
nose & throat are connected
descriptive panel
determines differences b/w food samples. Typically, participants receive in-depth training & are selected through a series of tests
First, they are screened based on:
Lifestyle - ex: smokers would be rejected b/c smoking effects the sensitivity of your taste buds)
How well someone can taste bitterness (some people have a very low threshold)
Participants are selected
Invited to various sessions & given a variety of products to evaluate
Use scales (ex: rate on 1-10)
Monitor health & lifestyle to identify if there is any change
expensive - used by universities & big companies
what is the goal of descriptive panels?
Want to see if various panelists have the same consensus for it to be precise
consumer panel
aren’t trained & are selected from the public based on specific demographics / criteria
Sample includes consumers – who they are trying to sell the product to
Use focus groups – consumers are asked to come in a grp & discuss the product
Collect a profile
triangle test
3 samples, samples should look the same so when people are tasting them they shouldn’t be able to differentiate b/w them (unless they are testing for colour)
2 are the same & 1 is diff - person needs to identify which one is diff
type of overall diff/discriminative test
duo-trio test
given 3 samples, but one sample is a reference & the other 2 samples are coded differently & people need to identify which one is the
type of overall diff/discriminative test
what types of tests are included in analytical tests?
type of overall diff/discriminative test
attribute diff test
descriptive tests
what are the 2 kinds of overall diff/discriminative tests?
triangle test
duo-trio test
paired comparison
2 samples are given & you need to identify which one is darker than the other – looking at darkness of the product
ranking test
given samples & asked to rank (testing more than 2 samples)
ranking diff test & when would this be used?
how diff is each sample diff from one another
Ex: a supplier is unavailable or changed – want to see if the ingredient from the changed supplier is too different & effects the overall product
Take ingredient from diff suppliers & test to see which one is the most diff & the most like the original
what are the types of attribute diff tests ?
rating diff test
ranking test
paired comparison
descriptive tests
more extensive testing
Create panelists – new product is introduced in the first few sessions & collect attributes of the product (brainstorm), they then agree upon each term (crunchy vs. crispy etc.), develop terms & unsure that everyone agrees so there is a precise measurement
affective test methods
how people feel about the product
acceptance test
accept, reject or given a scale
Ex: I like the sweetness, not it is this amount of sweet
type of affective test
paired preference
given a pair & are asked which one they like more
Doesn’t mean they like the product, just like it more than the other
type of affective test & paired test
preference ranking
given more than 2 samples & are asked which one they like the best, more samples follow & they continue to select the preferred
type of affective test & paired test
affective tests include what type of tests?
acceptance
paired tests - paired preference & preference ranking
paired tests include what type of tests?
paired preference & preference ranking
