Relationship Between Objective and Subjective Wheat Flour Tortilla Quality Evaluation Methods
Academic Article
Overview
Research
Identity
Additional Document Info
Other
View All
Overview
abstract
Accurate determination of tortilla quality is imperative because of the growing market. This calls for quality tests that are replicable. However, current tortilla quality testing relies heavily on subjective tests with unknown reliability. This study aimed to determine the relationship between subjective tortilla quality testing andavailable objective methods, and assess whether the latter can potentially replace the former. Correlation and regression analyses were done using data on subjective opacity and rollability, and objectiveL* value and texture parameters based on 114 wheat samples. Opacity scores and L & values were significantly correlated, but this relationship was affected by evaluator experience; in a controlled setting, experienced evaluators scores were more reliable (SEM = 0.25 - 3.8, r = 0.96) than less experienced evaluators (SEM = 0.25 - 7.3, r = 0.92). Tortilla rollability, which approximatesshelf stability, correlated most strongly with the rupture distance from two-dimensional extensibility test (r = 0.77). Subjective rollability at day 16 of storage was predicted by rupture distance (day 0) and work (day 4) (R2 = 0.69). Adding rupture force to the model slightly improves the R2 to 0.72. Objective color and texture parameter measurements have a potential to replace thesubjective tests as primary methods for tortilla quality. 2010 AACC International, Inc.
