The various steps in the application of freeze-drying technology are closely related, and the process is easily affected by other factors. Therefore, effective measures should be taken to eliminate the
interference of other factors in practical application to ensure the quality of drugs. Here are some points to be aware of for the different steps in lyophilization applications.
1. Prepare medicines
Drug preparation should be selected in combination with the implementation standards of freeze-drying technology to avoid damage to the drug during the freeze-drying process. Carefully check the
parameters used for freeze-drying medicines, and apply freeze-drying in a responsible attitude to the patient.
2. Drug pre-freezing treatment
Pre-freezing of medicines is the first step in freeze-drying medicines. The main purpose of this step is to solidify the physicochemical bound water and free water existing in the medicine, while ensuring
that the material structure of the medicine is not damaged. When pre-freezing the drug, it should be carried out in strict accordance with the pre-freezing operation specifications, otherwise the pre-
freezing quality is not good enough, the drug will not be frozen, which will affect the size and shape of the ice crystals during the pre-freezing process, which will affect the next freeze-drying step. , and even lead to freeze-drying failure.
At present, the pre-freezing treatment methods are mainly divided into two categories: quick-freezing and slow-freezing. Among them, the focus of slow freezing is on the quality of freezing, and quick
freezing reflects the effective control of the efficiency and time of drug freezing. It can be seen that there are significant differences between the two methods, and each has its own advantages. In
addition, during the pre-freezing process, attention should be paid to the crystallization state, and the machine should be operated flexibly to keep the crystallization in a normal state. The operation requirements of this process are high, and experienced technicians should be responsible for this link.
3. Sublimation drying
This freeze-drying step removes the natural moisture that crystallizes in the drug product. The focus of this step is on the control of vacuum degree and temperature. In order to accurately grasp the amount
of water removed, the specific heat capacity of the medicine in different steps should be calculated, so as to achieve a better drying effect.
4. Analysis and drying
This lyophilization step removes the structural water in the drug product. After a lot of practice, it has been proved that the length of time required for the analytical drying process has a great relationship with the working performance of the freeze dryer, so it should be focused on this step.
5, sealed preservation
This is the last step in the treatment of pharmaceutical freeze-drying technology, and it is also a closing link that needs to be taken seriously. It must not be sloppy.
The development of freeze-drying technology is relatively mature today, and its contribution to the application of pharmaceutical technology is more prominent. In practical application, there are still
many problems in freeze-drying technology, so freeze-drying application personnel are required to strengthen the research on freeze-drying technology, so that freeze-drying technology can benefit mankind.