FDSC 4100 Question and answers
already passed
Sensory Evaluation - correct answer • Scientific discipline used to evoke,
measure, analyze, and interpret those responses to products that are
perceived by the senses of sight, smell, touch, taste, and hearing.
• Set of measurement procedures
• Way to reduce uncertainty and risks in decisions
• Ensure cost efficient delivery of new products with high consumer
acceptability
Central Dogma of Sensory - correct answer • Sensory test method chosen
must fit the objectives of the research question
• Specifics:
o Appropriate panelists must be selected for the test
o Inappropriate questions must Not be asked of those panelists
Sensory Evaluation Tests - correct answer • Discrimination: are products
different in any way?
• Descriptive analysis: what are the intensities of specific attributes?
• Affective/Hedonic Tests: are products liked, which are preferred?
Discrimination Testing - correct answer Two products Different
• Setup: 20-50 panelists, screened for acuity
• Triangle, duo-trio, or paired comparison tests, replicated
• Analysis via significance tables from binomial distribution
,• Advantages:
o Quick, simple in procedure and analysis
o Can be worked into recurrent testing program
o Only a few discriminators yield significant test results
• Limitations:
o Limited information (yes/no)
o Not suitable if variation is acceptable
o Test lacks sensitivity if not focused on specific attribute
• Triangle: chose sample most different: A,B, or A'
• Duo-Trio: Choose sample that matches the reference
• Paired comparison: which sample is sweeter
Examples of discrimination problems - correct answer o Ingredient sub.
o Supplier/raw material change
o Shelf life
o Packaging change
o Processing conditions change
o Before a more expensive consumer test
♣ Note logic: if there's no discrimination, there could be no pref.
Descriptive Analysis - correct answer How do products differ in particular
sensory attributes
• Setup: 8-12 panelsits, screened for acuity, motivation, and trained
• Intensity rating scales for all sensory attributes, replicated
• Analysis of variance comparisons between means
, • Advantages: detailed information
o Relation to consumer opinion, to ingredient, processing, packaign variables
• Limitations:
o Time consuming (setup and conduct tests) / expense
• Not sweet, very sweet, etc.
Example of descriptive problems - correct answer o Compare with
competitors products
o To analyze a fault
o To survey gaps in a market
o To probe for the exact effect your change had on the end product
o Quality control specifications
o To interpret consumer rejection of a product
Recent Descriptive Apps - correct answer o Light damage of foods
o Processing variables of milk powders
o Chicken/eggs-feed variable
o Benecol salad dressings-shelf life
o Benecol snack bars-shelf life
o Milk Quality improvement and shelf life
o Milk packaging studies
o Genetically modified tomatoes
o Hydroponic lettuce flavored growing media
Consumer Acceptance - correct answer Are products liked
already passed
Sensory Evaluation - correct answer • Scientific discipline used to evoke,
measure, analyze, and interpret those responses to products that are
perceived by the senses of sight, smell, touch, taste, and hearing.
• Set of measurement procedures
• Way to reduce uncertainty and risks in decisions
• Ensure cost efficient delivery of new products with high consumer
acceptability
Central Dogma of Sensory - correct answer • Sensory test method chosen
must fit the objectives of the research question
• Specifics:
o Appropriate panelists must be selected for the test
o Inappropriate questions must Not be asked of those panelists
Sensory Evaluation Tests - correct answer • Discrimination: are products
different in any way?
• Descriptive analysis: what are the intensities of specific attributes?
• Affective/Hedonic Tests: are products liked, which are preferred?
Discrimination Testing - correct answer Two products Different
• Setup: 20-50 panelists, screened for acuity
• Triangle, duo-trio, or paired comparison tests, replicated
• Analysis via significance tables from binomial distribution
,• Advantages:
o Quick, simple in procedure and analysis
o Can be worked into recurrent testing program
o Only a few discriminators yield significant test results
• Limitations:
o Limited information (yes/no)
o Not suitable if variation is acceptable
o Test lacks sensitivity if not focused on specific attribute
• Triangle: chose sample most different: A,B, or A'
• Duo-Trio: Choose sample that matches the reference
• Paired comparison: which sample is sweeter
Examples of discrimination problems - correct answer o Ingredient sub.
o Supplier/raw material change
o Shelf life
o Packaging change
o Processing conditions change
o Before a more expensive consumer test
♣ Note logic: if there's no discrimination, there could be no pref.
Descriptive Analysis - correct answer How do products differ in particular
sensory attributes
• Setup: 8-12 panelsits, screened for acuity, motivation, and trained
• Intensity rating scales for all sensory attributes, replicated
• Analysis of variance comparisons between means
, • Advantages: detailed information
o Relation to consumer opinion, to ingredient, processing, packaign variables
• Limitations:
o Time consuming (setup and conduct tests) / expense
• Not sweet, very sweet, etc.
Example of descriptive problems - correct answer o Compare with
competitors products
o To analyze a fault
o To survey gaps in a market
o To probe for the exact effect your change had on the end product
o Quality control specifications
o To interpret consumer rejection of a product
Recent Descriptive Apps - correct answer o Light damage of foods
o Processing variables of milk powders
o Chicken/eggs-feed variable
o Benecol salad dressings-shelf life
o Benecol snack bars-shelf life
o Milk Quality improvement and shelf life
o Milk packaging studies
o Genetically modified tomatoes
o Hydroponic lettuce flavored growing media
Consumer Acceptance - correct answer Are products liked
