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Industrial Propionic Acid Testing Standard
1. Scope of Application
This method is applicable to the determination of propionic acid in pastries, mooncakes, non-fermented soybean products, and vinegar, with a limit of quantitation of 0.10 g/kg.
2. Preparation of Standard Solutions
Standard Stock Solution
Accurately weigh 100 mg of the standard into a 10 mL volumetric flask, dissolve with water, and dilute to the mark to obtain a concentration of 10 mg/mL.
Standard Intermediate Solution
Accurately pipette 1 mL of the 10 mg/mL standard stock solution into a 10 mL volumetric flask, dilute with water to the mark, and mix well to obtain a concentration of 1.0 mg/mL.