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ا�ل�ع�ج�ي�ل )M.SC FOOD

TECHNOLOGY

Computer Aided Sensory Evaluation for Foods and

Beverages

Table of Continents

Question human sense vs. computerE-Tongue & E-Nose Computer application in

sensory evaluationIntegrated software for

sensory evaluationCompusense five softwareCase studyConclusionReferences

How can the computer be Useful in sensory evaluation field

QUESTION

will the computer eat the food and evaluate it

Human Senses

Does the computer have those senses

Human senses

Sight

Hearing

Taste

Smell

Touch

Computer

Color detectors

Sound detectors

E-Tongue

E-NoseTexture

instruments

Today We haveColor detector and sound detectors

Also we have E-Tongue And E-Nose

E-Nose

E-tongue & E-NoseThough e-nose and e-tongue are very good in detection of chemical compounds , but they can not tell which food is better in taste or smell.

Now a days e-nose has a lot of application but mostly medical application

E- tongue is emerging technology which has a lot of promise in medical fields

How can the computer be Useful in sensory evaluation field

QUESTION

Developments in hardware and software in the last decade have dramatically changed the role of computers in sensory analysis.

Besides data-entry and data-analysis, personal computers are used more and more for data-collection, experimental design and panel-management.

Tests are prepared on the personal computer, the questions are displayed on screens in the tasting booths, the subjects can enter their responses directly and the results can be available instantaneously..

Computerizing the sensory evaluation

New approaches to software development, like object-oriented programming, artificial intelligence and relational database management systems will make it possible to use the computer for more aspects of sensory evaluation.

It is important to identify the different tasks in the laboratory that can be automated and to look for the right tools to use.

Software for sensory Evaluation

There is no special data input method for sensory evaluation, but it require special integrated software which is flexible , user friendly , and inexpensive.

Integrated Sensory Evaluation Software

Data collectionData quantificationData analysisData reporting

Some data collection input devices

AutomatedInteractiveFlexible-WirelessPen or/and keyboardHandwritten notes

Data Collection – Tablet PCs

Compusense five is sensory evaluation software that allows you to conduct a comprehensive test, right from the planning stage through to analyzing and reporting your results.

Simply install it on your local area network (LAN) to start running tests that yield reliable, repeatable results.

Cmpusense introduction video

Start end

Question types include line scale, category/hedonic, keypad, ranking, multiple choice, standard descriptor (choose all that apply), triangle, duo-trio, R-index, paired comparison, comment, Labeled Magnitude Scale, and Time Intensity. Use these questions and customize them to suit your needs.

Flexible question designs with options such as attribute definition pop-up boxes, the ability to hide question responses, and to force an answer before moving to the next question.

Add graphic images, videos, and sound files to your test. Give verbal instructions to your panelists.

Compusense five software features

Compusense five software features

Create custom templates! Customize and re-use questionnaires, individual questions, attributes and all text screens (such as Welcome texts, Instruction texts, and Thank-you texts).

Add breaks to a test. You can use a time delay, partially present a test or allow panelists to stop and restart a test.

Use Branching to guide panelists through a series of questions while skipping others depending upon their response to key questions such as product usage.

Using Compusense five software to select and train panelists members

graph showing the percentage of panelist responses of members to different sweet samples .

CREATING USER FRIENDLY SOFTWARE FOR SENSORY ANALYSIS

AUTHOR : C . J . , F I N D L AY. 1 9 8 6

Case study

Case study

C.J. Findlay et al. had done a research to integrate computer in sensory analysis.

They used IBM-PC, and panelist input was simplified by using a light pen and interactive questionnaire program.

The system was integrated to allow preparation of descriptive, hedonic , triangle , structured and unstructured ballots; registration of panelist ; collection of data; statistical analysis and report generation.

They found that the computer had a large impact on data analysis where data collection was still done manually.

Even though many attempts were done to incorporate computer into different aspects of sensory analysis but they result in either expensive systems or inflexible.

Their aim was to develop an integrated sensory analysis system that would be both user and operator “friendly”, flexible, comprehensive and relatively inexpensive.

To develop the system they found that the keyboard was recognized as barrier to communication with computer, and the simpler alternatives were mouse, touch-screen and digitalizer

But the major drawback of these devices included eye-to-hand coordination, high expenses, fingerprint on monitor screen and the continued requirement for paper ballots.

So they had chose the light pen for software developing because of its simplicity , durability, and precision

Mouse and keyboard Ballot Paper

Input methods

Light pen Light pen

Input methods

Created program has the following capabilities

When the analyst prepare a questionnaire, the program uses a menu format to present the design option. (Example of design is shown in the next slide.)

Randomize presentation numbers are generated by the program and assigned to each sample.

Presentation of samples is then randomized by panelist over all the screen in the system.

The sample number is shown at the end of each line in the unstructured line scale.

Example 1

The title of the panel session appears at the top of the screen. The attribute being tested is shown under the title with extreme description at each end of the line .

The panelist respond by placing the light pen at the point on the line that best describe his response to attribute

A line marker appears at that point. The mark is recorded us a number, which computer use in subsequent data analysis.

Once finish the testing session the panel list can select “Quite” out of various option at screen bottom.

If a question is not answered, the program informs the panelist to complete it.

Panelist has option at the screen bottom to go for next and previous screen , and box showing number of total questions and the questions done.

Example 2: Seven point hedonic scale

The panelist respond by placing the light pen in the box under the label which best describe the response to sample. This response is recorded as numerical value by the computer.

The out come of the study

Panelists were adapted rapidly to the use of the light pen and found they were able to concentrate on the product being tested rather than worrying about the computer system.

Panelist taken shorter time for the analysis session Analysis of variance and printed report were

produced with in 5 minutes of the end of the panel.That means “ it was able to cut the time required

for the sensory panel in half. Also the simplicity of the system and lends itself to rapid learning and acceptance both by panelist and analyst.”

Negative capabilities of the system ere found when the panel list couldn't add a comment when he needs to du to keyboard lacking, but that was overcame by devising an “on-screen” keyboard that can be typed by placing the light pen on letters.

The panel list need to place the light pen at the comment space so the on-screen keyboard will appear and then he can place light pen on letters one by one to write his comment as shown in the next slide

Conclusion

Computerized sensory evaluation reduce the time taken to conduct sensory test and to analyze the data obtained.

Computerized sensory evaluation save the time taken in data entry in the computer.

Computerized sensory evaluation help in reduce the time required to train a panel member.

Computerized sensory evaluation is a necessity when large numbers of tests per annum are conducted.

developed Software allow conducting different types of sensory evaluation tests

Conclusion cont…

Computer senses such as E-Nose and E-Tongue are emerging techniques that found their application in different science fields such as medical filed but they can not replace human in sensory evaluation field.

E-Nose and E-Tongue can be use as QC tool in Monitoring Product Quality and in conducting some routine sensory analysis.

Thank You