Determination of Content of Chemical Reference Materials for Traditional Chinese Medicine
Due to being extracted or refined from organic solvents, traditional Chinese medicine chemical reference materials generally have low moisture content. Therefore, in the absence of a specified moisture content, only high melting point traditional Chinese medicine chemical reference materials are required to be dried at 105 ℃ during calibration. Meanwhile, unstable reference materials can be dried in a silica gel or phosphorus pentoxide vacuum dryer before application. Strictly speaking, the reference substance should have a drying weight loss limit, and there should also be regulations for residual organic solvents.
According to experts, in the past, methods for dete......