Sensory Evaluation PDF

RATING BRANDS Introduction to Sensory Evaluation CHAPTER 1  Table of contents Sensory 01 History of Sensory testing 02 Evaluation Human Subject Conducting Sensory 03 as Instrument 04 Study  Lea...

RATING BRANDS Introduction to Sensory Evaluation CHAPTER 1  Table of contents Sensory 01 History of Sensory testing 02 Evaluation Human Subject Conducting Sensory 03 as Instrument 04 Study  Learning Objectives At the end of the discussion, pre- service teachers are expected to: Trace the history of sensory testing. Define sensory evaluation. Explain the role of human subjects as instrument. Enumerate the steps of sensory study. History of Sensory Testing 1950- History of systematic “sensory” analysis that is based on wartime efforts of providing acceptable food to American forces. Organoleptic testing used in literature to denote supposedly objective measurement of sensory attributes Sensory Evaluation comprises a set of techniques for accurate measurement of human responses to foods. Sensory Evaluation Evoke Measure Analyze Interpret  Sensory Evaluation The role of sensory evaluation is to provide valid and reliable information to R&D, production, and marketing in order for management to make sound business decisions about the perceived sensory properties of products. Four Factors Definition of the problem: what is to be measured must be precisely defined. Test design- must minimize the amount of testing required to produce the desired accuracy of results. Four Factors Instrumentation: the test subjects must be selected and trained Interpretation of results: using statistics Human Subjects as Instruments quite variable over time very variable among themselves highly prone to bias A good scale requires much study, must be based on a thorough understanding of the physical and chemical factors.  The stimulus hits the sense organ and is converted to a nerve signal that travels to Chain the brain. of Brain then interprets, organizes, and Sensory integrates the incoming sensations into perceptions. Pereption A response is formulated based on the subject’s perceptions Seven Practical Tasks 1. Determine the project objective 2. Determine the test objective 3. Screen samples 4. Design test 5. Conduct test 6. Analyze data 7. Interpret and report results 1. Determine the project objective match of a product competitor’s improvement product? ? to permit cost reduction or ingredient Substitution? 2. Determine the test objective. test objective: overall difference, attribute difference, relative preference, Avoid attempting to acceptability, etc. answer too many questions in a single test. 3. Screen the samples Sensory analyst should examine all of the sensory properties of the samples to be tested. 4. Designing the test This involves selection of the test technique, selecting and training subjects, designing the accompanying scoresheet, specifying the criteria for sample preparation and presentation, and determining 5. Conduct the test The sensory analyst is responsible for ensuring that all the requirements of the test design are met. 6. Analyze the data The necessary expertise and statistical programs, if used, will be ready to begin data analysis as soon as the study is completed. 7. Interpret and Report Results Statement of the project and test objectives will enable the sensory analyst to review the results, express them in terms of the stated objectives, and make any recommendations. Sensory evaluation is needed when companies are developing new products, attempting to enter new markets or compete more effectively in existing markets.