Descriptive methods Flashcards
What are the applications of descriptive methods?
Quality control
Monitor competition
Investigate storge effects
NPD
What are the methods for descriptive techniques?
Flavour and texture profile
Quantitative descriptive analysis (QDA)
Sensory spectrum
Time intensity analysis
Free choice profiling
What are absolute scales?
Intensities represented by scale
What is the use of absolute scales?
Allows direct comparison across attributes
What are relative scales?
Range of scales for different attributes that maximise intensity
What is the method for flavour profiling?
5-8 panellists
8 point ordinal scale of intensity
Fixed reference of intensity
Consensus scores developed
What is the method for texture profile analysis?
5-8 panellists
Trained using reference scales
Score products on scale
What is the sensory spectrum?
15 point scale which uses ANOVA, lexicon and category anchors (lemon data)
What are the advantages of a sensory spectrum?
Compares data from panels
What are the disadvantages of using sensory spectrums?
References based on American products which vary
What is QDA?
Can be used on all senses and products
Uses limited number of screened subjects
Develops language for product
How are descriptions generated?
Test product range
Generate descriptors individually
Panel discussion
Define descriptors
What are the objectives of training panellists?
Consistent use of scales and descriptors
Develop ability to quantify attributes
Identify inconsistent panellists
What are the training stages?
Standard samples to aid description
No references
How much training do assessors need?
5-120 hours
Why is rating of samples repeated during training?
For consistency of quantifying attributes
What is the evaluation of training assessors?
Final sequential monadic sample presentation
2-6 replicates
Attributes assessed in order perceived
What is the data analysis used for descriptive methods?
Determine statistical differences between products and assessors (lemon data)
