Definition

1. Noun:
   • Lyophilization: A technical term referring to the process of freeze-drying, where a substance is frozen and then the surrounding pressure is reduced to allow the frozen water in the material to sublimate directly from the solid phase to the gas phase.

Usage Examples

• Noun:
  • Đông khô lạnh là một phương pháp bảo quản thực phẩm và dược phẩm hiệu quả. (Lyophilization is an effective method for preserving food and pharmaceuticals.)
  • Quy trình đông khô lạnh giúp giữ nguyên cấu trúc và hoạt tính của vi khuẩn. (The lyophilization process helps maintain the structure and activity of bacteria.)

Advanced Usage

• This term is highly specialized and is primarily used in scientific, industrial, and medical contexts such as biochemistry, pharmaceuticals, and food technology.
• It describes the complete technical process, not just the state of being frozen or dry.

Variants and Related Words

• Máy đông khô lạnh (n): Freeze-dryer, lyophilizer.
  • Phòng thí nghiệm mới được trang bị một máy đông khô lạnh hiện đại. (The new laboratory is equipped with a modern freeze-dryer.)
• Sự đông khô (n): Freeze-drying (a more general term, sometimes used interchangeably but "đông khô lạnh" is the precise technical term).

Synonyms

• Sấy thăng hoa: Freeze-drying (a descriptive synonym using "sublimation").
• Lyophilisation: The French-derived term, identical in meaning (used in some Vietnamese scientific contexts).

Notes on Meaning

• "Đông khô lạnh" is a compound noun formed from "đông" (freeze), "khô" (dry), and "lạnh" (cold), precisely describing the cold, freeze-drying process. It is treated as a single, fixed technical term.
• It should not be confused with simple freezing ("đông lạnh") or simple drying ("sấy khô").

1. Lyophylization