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We conducted impurity testing on ferulic acid at the request of the customer. When we treated ferulic acid, we found that different additives would have different performances.

1. Ethyl acetate:

When ethyl acetate is added to ferulic acid, the solution turns yellow. This is because ethyl acetate may react with ferulic acid or form a certain chemical environment, causing it to appear yellow. This color change does not indicate a problem with the product, but rather reflects the color characteristics after a chemical reaction.

1. Methanol:

When methanol is added, the ferulic acid solution remains colorless. This indicates that methanol does not cause a color change when dissolving ferulic acid, usually because the interaction between methanol and ferulic acid does not produce a significant color change.

The final test results showed that no impurities were found during the treatment of ferulic acid. This indicates that whether adding ethyl acetate or methanol, the purity of ferulic acid meets the requirements, and the quality of the product is reliable. This color change is only due to the influence of different solvents on the chemical properties of ferulic acid, and is not related to the actual purity of the product.