Solvent residue and nutrient loss.

1. In the process of leaching rice oil, solvents are used to extract fat, such as n-hexane. Solvent residues remain in the final rice oil, posing potential risks to human health. However, according to Chinese national standards, solvent residues in edible oils should meet specified limit standards to ensure their safety.

2. The process of leaching rice oil will cause the loss of some nutrients. Some nutrients in rice, such as vitamins and phytosterols, are partially lost during the extraction process.