lyophilized
Definition
- Adjective:
- Dried by a freeze-drying process: Describes a biological substance (such as tissue, blood, serum, or a vaccine) that has been preserved by first freezing it and then removing the ice by sublimation under a high vacuum. This process removes water while keeping the structure and biological properties largely intact.
Usage
The adjective "lyophilized" is used almost exclusively in scientific, medical, and pharmaceutical contexts to describe the state of a material that has undergone lyophilization. It is typically placed before a noun or used after a linking verb like "is" or "was." * It modifies nouns for biological substances: lyophilized powder, lyophilized sample, lyophilized culture, lyophilized plasma. * It describes the result of a process: The enzyme was lyophilized for long-term storage.
Examples
- The vaccine is stable at room temperature and is reconstituted with sterile water before injection.
- For the experiment, we used a form of the bacterial toxin.
- This protocol requires human serum albumin.
- The tissue samples were immediately after collection to prevent degradation.
Advanced Usage
- Technical Specification: The term is used in formal documentation to specify the form of a material. For example: "Active Pharmaceutical Ingredient (API): white to off-white cake."
- Passive Voice Construction: The past participle form is common when describing the action performed on the substance. For example: "The protein solution was overnight."
Variants and Related Words
- Lyophilization (n): The process of freeze-drying.
- Lyophilize (v): To perform the freeze-drying process.
- Freeze-dried (adj): A more general synonym often used interchangeably in many contexts, though "lyophilized" is the preferred technical term in biology and medicine.
Synonyms
- Freeze-dried
- Sublimation-dried (technical)
Antonyms
- Hydrated
- Liquid
- Reconstituted (specifically after the lyophilized product has had water added back)
Adjective
-
used of tissue or blood or serum or other biological substances; dried by freezing in a high vacuum
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