GB/T 39558-2020
Sensory analysis—Methodology—“A”-“not A” test

Standard No.

GB/T 39558-2020

Language

Chinese

Release Date

2020

Published By

国家市场监督管理总局、中国国家标准化管理委员会

Lastest

GB/T 39558-2020

Replace

GB/T 12316-1990

Scope

This standard specifies a method for judging whether there is a sensory difference between two types of products. The method is suitable for differential discrimination of single or multiple sensory attributes. In sensory analysis, the "A"-"non-A" test can be used for: a) difference test: especially suitable for example in appearance (the appearance of repeated samples is difficult to be prepared to be completely consistent) or aftertaste (aftertaste difference between samples) make direct comparison difficult); b) identification test: especially useful for determining whether an assessor or panel can identify a new stimulus relative to a known stimulus (e.g., identify the sweetness of a new sweetener). quality); c) sensory test: used to determine the evaluator's ability to distinguish stimuli. The "A"-"non-A" test is not suitable for judging whether two types of products are similar enough to be used interchangeably (for example, for similarity tests), because the essence of the "A"-"non-A" test is that all evaluators evaluate the same product Repeated evaluation, and this repeated evaluation violates the basic assumption that the similarity test is statistically valid. See Appendix A for its application examples. Note: Bi and Ennis pointed out that no matter how the repeated evaluation is implemented in the test, the difference d' between the "A" and "non-A" samples is constant, but the variance of d' depends on the specific implementation form of the repeated evaluation . This standard does not discuss the Thu rst on i an analysis of the "A"-"non-A" method and the validity of the test. Interested readers can refer to reference [1] for a detailed discussion on this topic.

GB/T 39558-2020 Referenced Document

• ISO 3534-1 
• ISO 5492 Sensory analysis - Vocabulary; Amendment 1
• ISO 8586:2012 Sensory analysis - General guidelines for the selection, training and monitoring of selected assessors and expert sensory assessors
• ISO 8589 Sensory analysis — General guidance for the design of test rooms AMENDMENT 1

GB/T 39558-2020 history

• 2020 GB/T 39558-2020 Sensory analysis—Methodology—“A”-“not A” test
• 1990 GB/T 12316-1990 Sensory analysis--Methodology--"A"-"not A" test

GB/T 39558-2020 Sensory analysis—Methodology—“A”-“not A” test has been changed from GB/T 12316-1990 Sensory analysis--Methodology--"A"-"not A" test.