Sensory Flashcards
What is the flavor attribute of 2,3-butanedione?
Diacetyl, like butter, butter popcorn, or warm milk
What is the flavor attribute of Dimethyl Sulfide?
DMS, boiled sweetcorn, tomato sauce
What is the flavor attribute of Ferrous Sulfate?
Metallic, like ink or blood
What is the flavor attribute of Hop Oil Extract?
Traditional English dry hop character
What is the flavor attribute of Hydrogen Sulfide?
H2S, like boiled or rotten eggs
What is the flavor attribute of Isoamyl Acetate?
Bananas or boiled sweets
What is the flavor attribute of 3-methyl-2-butene-1-thiol?
Lightstruck, like a skunk or freshly brewed coffee, cannabis like
What is the flavor attribute of Trans-2-nonenal?
Papery, like dry paper or cardboard
What is the flavor attribute of 2,4,6-trichloroanisole?
TCA, musty, like corked wine or a damp cellar
What is the flavor attribute of 4-vinyl guaiacol?
Phenolic-4-VG, like cloves or carnations
What is orthonasal olfaction?
It is sensing aroma via the pathway through your nostrils
What is retronasal olfaction?
It is sensing aroma via the pathway through your mouth and into your nasal cavity
What does it mean to have an anosmia?
You cannot smell a certain chemical compound (or aroma)
What is “astrigency”?
The degree to which the sample feels dry in the mouth
What is “mouthwatering”?
The amount of moisture created in the mouth
What is the term for the degree of resistance felt when moving the tongue through a sample?
Body
What is the test called in which participants select a phrase that best describes their degree of liking of the product?
Hedonic testing
What is the test called in which participants use a common language to describe the flavor profile of a sample?
Description Test
What is the TTT test?
True-To-Target Test
Using the target description, identifies if the sample is in or out of the acceptable range of variability
Which bias is due to a decrease in responsiveness under conditions of constant stimulation?
What should be the maximum number of samples/panel to avoid this?
Adaptation
8 samples/panel
What is expectation error?
A panelist uses knowledge of a sample to form a sensory judgement instead of using their actual sensory perceptions.
What is selective perception?
The panelist ignores information that falls outside of their expectations or beliefs
When sampling a beer, somebody yells “pineapple!” and now you taste pineapple immediately. What is this an example of?
Mutual suggestion
What are these examples of?
- Fruity aroma pairs with sweet taste
- Dark color pairs with roasty aromas
Logical errors
What is the halo effect?
A positive evaluation of one characteristic boosts the ratings of other independent characteristics
Two samples are presented squentially and they differ in one or more characteristics.
The panelist overestimates the magnitude of the difference
What is this bias referred to as?
Contrast Effect
What is the pattern effect?
A panelist detects a general pattern to the order of the presentation of samples. The panelist’s brain exploits this information to match their perceptions to the perceived pattern
The first sample effect shows that panelists frequently assess the first sample of a tasting less favorably than the rest of the samples.
True or False?
False
How are presentation order effects negated?
The samples are randomized
What is a default effect?
When given a choice of two or more options, panelists will usually favor the default response if one exists.
A common result in TTT where panelists pass samples that should not have passed.
A bias in which people tend to place higher value on things that they have created.
What is this called?
The IKEA Effect
Example: a brewmaster on the tasting panel gives his beers a higher rating
Why is it important to taste beer prior to packaging it?
Dumping packaged beer costs ~20% more than dumping beer out of the bright tank
How many assessors should be present for in-process spot checks?
At least 2
What is the maximum number of people for a useful round table?
10
How many assessors are need for a barrel blending program?
1 leader and only a few additional experts
Smoke flavor can be filtered out of water using carbon filtration
True or False?
True
Smoke flavor can removed from water by boiling.
True or False?
False
What is Geosmin and how does it affect water flavor?
Geosmin is the smell of dry earth after a summer rain…
It is caused by algal blooms in the water shed.
Chlorine can be volatized and removed from water by boiling.
True or False?
True
What is the process used to taste CO2?
Bubble the CO2 through water and drink it.
What is the flavor attribute of chlorophenol?
Band-aid, iodine, medicinal
What is the flavor attribute of sulfur dioxide (SO2)?
Flinty, gun powder
What are the 4 reasons for hop sensory evaluation?
- Breeding
- Selecting
- Making new beers
- Making consistent beers
What are the 4 reasons for malt senory evaluation?
- Crop year evaluation
- Vendor qualification
- Product development
- Anomaly tracking
What are the 3 non-targeted difference tests?
- Triangle
- 3 samples given, must decide which 2 are the same sample
- Tetrad
- 4 samples given, must decide which pairs are the same sample
- Duo-trio
- Which sample matches the reference?
What are the two target difference tests?
- X-alternative force choice
- 2 or 3 samples
- “Indicate which sample has a higher level of bitterness”
- Degree of difference
- Acknowledges inherent product variability by including 2 reference samples and 1 test sample
What does the Null Hypothesis state in Hypothesis Testing?
The Null Hypothesis is the default position stating that there is no difference between the samples
What is Type I error?
- Also referred to as Alpha
- Says that the samples are different when they are not
- Beer A and B were not actually different but a difference was concluded
What is Type II Error?
- Also referred to as Beta
- Says that the samples are similar when they are not
- Beer A and B were actually different but a difference was not concluded
How many assessors are required for a Triangle Test to be statistically relevant?
18-36
How many assessors are required for a Tetrad Test to be statistically relevant?
15-33
What is a p-chart used for?
What is the UCL?
- A chart relating the TTT to the NOT TTT ratings for a brand
- The UCL is the Upper Control Limit where if the UCL is exceeded, there is an issue that needs to be resolved
