181 Dye Color-Chart method for pH determination of rice grains

Methods Type: Generic Methods
Key data
Number: 181
Analyte: Rice grains
Matrix: Dye Color-Chart method
Year of Approval: 2014
Scope: This method is set for the determination of pH value of brown and milled rice grains.
Principle: The macromolecules in rice grains, including carbohydrates and lipids, will gradually degrade into organic acids, such as amino acids and free fatty acids during storage, which result in the increasing acidity of rice grains. The pH value of rice grain is detected by dying with Bromothymol Blue (BTB)-Methyl Red (MR) dye solution and comparison with a standard color chart.