100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary lectures HNE-30506 $3.91   Add to cart

Summary

Summary lectures HNE-30506

2 reviews
 286 views  2 purchases
  • Course
  • Institution

Complete summary of the lectures written in the form of questions. For questions or if something is unclear, feel free to contact me. Note: pictures may not be shown in the example, but they are really there! :)

Last document update: 8 year ago

Preview 3 out of 32  pages

  • October 17, 2016
  • October 17, 2016
  • 32
  • 2016/2017
  • Summary

2  reviews

review-writer-avatar

By: lotteterhuerne • 6 year ago

review-writer-avatar

By: nicoletimmerman • 7 year ago

Translated by Google

Mostly literally the slides are below each other and little additional information about what it means / examples from the college

avatar-seller
Summary Principles of Sensory Science
Lecture 2: Selection and Training of Sensory Panels
- Chapter 3 – Principles of good practice; 3.5 Panellist consideration.
After the lecture the student is expected to:
- Know how to select assessors for sensory panels for different purposes
- Understand the role of the panel leader for the success of sensory projects
- Know different manners of attribute generation
- Be able to generate sensory attributes for the QDA in this course
- Understand and be able to explain how different methods of descriptive analysis require different
degrees of training
- Know and be able to apply the methods of consensus training and individual vocabularies

Why select sensory subjects?
→ Find all the nuances that can be detected e.g. intensity.

How to select sensory subjects?
→ Recruitment of analytical sensory panels (repeatable and precise):
- Internal or external
- Age 20-55 (senses are stable)
- Test about twice the number of subjects needed
- Announcement… media, canteen, class, etc.
→ Panel selection by questionnaire:
- Personality: Be able to work in a team; ”Cosmopolitan” preferences; Positive not over-
bearing; Good listener and communicator; Committed and flexible.
- Health: General good health condition; Documentation of any health restrictions
(medication, allergies, pregnancy, false teeth, …)
- Availability
→ Panel selection by tests for sensory ability
Example of a rapid taste
test is papers dipped in
different concentrations
to test if you taste the
basic taste.
Rapid odour test Sniffin’
sticks:




How to train sensory subjects?/ When is the panel trained enough?
→ General training: familiarisation with test protocols, discrimination tests, intensity scaling
→ Product specific training: describe what the different properties are, especially important for
descriptive analysis.
→ Attribute specific training: making concepts cognitive clear (=understandable) to the sensory panel

,Selection and training of subjects needed for descriptive, not for threshold and discrimination:




Check performance over time?
→ Monitoring of performance of analytical sensory panels
- Inter individual variation (between individuals)
- Intra individual variation (within individual)
- Sequential analysis – long-term performance
- Feedback on performance to individual or panel

What are the roles and personal characteristics of a panel leader?
→ Type of roles (depending on the method)
- Passive facilitator (e.g. QDA)
- Directive leader (e.g. Spectrum)
→Personal characteristics
- Non-judgemental/opinionated
- Sensitive and assertive, but diplomatic
- Leading panel discussions but active listener
- Recognises and guards against moderator bias
- Ability to motivate panel


Lecture 1: Descriptive Sensory Analysis
- Chapter 10 – Descriptive analysis
After the lecture the student is expected to:
- Know the principles of methods such as mapping, napping, Flash Profile and their field of application

What is descriptive sensory analysis?
- A method aiming to provide a quantitative measure of the sensory properties for a set of
products
- A number of different approaches
o Trademarks (QDA and Spectrum)
o Speed versus accuracy (accuracy not good with rapid methods; training panel for a
long time gives a food accuracy, find a lot of details)
o Relations to instrumental measures (perception of sourness and ph value in milk; if
correlated that replacement of sensory panel by instrument)

, Why using descriptive sensory analysis?
- Product reformulations
- New product development
- Quality control
o Acceptability to specified target
o Calibration of instrumental methods
- Brand mapping (e.g. identifying sensory niches)
- Consumer preference mapping
- Research
o Understanding relationships between product/process/production properties and
perceptible properties

What are the main differences between methods?
- Generation of sensory descriptors
- Degree of subject training
- Use of reference materials and scaling




What is the flavor profile method?
- Consensus method (4-6 judges; 2-3 weeks training)
- A qualitative descriptive method – no statistical analysis possible due to consensus scores
- Reference materials for discussing and defining
- Limited to flavour impressions
- Estimate intensity of flavour attributes (aroma, flavour, mouth feel and aftertaste). Expand
with - + ½ ↑ ↓




- Estimate intensity of overall amplitude (overall balance and blending of product):

What is the Quantitative Descriptive Analysis?
- Data from individual panel members (n=10-12) in sensory booths
- Concensus wrt. attribute generation and use
- Reference standards used only occasionally
- A 6 inch (15.2 cm) continuous line used for measuring intensity (psychological research)
- All kinds of sensory attributes
- Selection of attributes for all modalities or fewer
- Risk for perceptual dumping considered in attribute selection – include e.g. ”other
impressions”
- Panel leader is passive member in selecting attributes; facilitates the process
→ Many variations on this method but should not be called QDA!

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Inge-Sofie. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $3.91. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

83430 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$3.91  2x  sold
  • (2)
  Add to cart