way to preserve the flavor of the raw material itself.
4, reduce the oil deterioration degree: the deterioration of frying oil, including oxidation, polymerization, thermal decomposition, and water or water vapor and oil contact hydrolysis dominated. In the vacuum frying process, the oil is in the negative pressure state, and the gas dissolved in the oil is very quick to escape, the water vapor pressure is small, and the frying temperature is low, so the deterioration degree of the oil is greatl