為什么需要凍融工藝的步驟

Regulations mandate that biopharmaceutical product quality be controlled throughout manufacturing, storage, transportation, and delivery to patients (1). Operations often include freezing and thawing of a bulk drug substance, dilution of that purified substance to a target concentration, filtration, filling into a selected container–closure system, additional processing (e.g., lyophilization), inspection, packaging, storage, transport, and delivery (2).

法規要求在制造，儲存，運輸和交付給患者的過程中控制生物制藥產品的質量（1）。 操作通常包括將原液冷凍和解凍，將純化后原液稀釋至目標濃度，過濾，灌裝到選定的封閉容器系統，額外工藝（例如，凍干），檢查，包裝，儲存，運輸和交付（2）

Freezing is a common processing step used to maintain stability and quality of a drug substance during development and production of biopharmaceutical products. It is generally agreed upon that freezing drug substance maximizes productivity and reduces overall production costs by decoupling bulk solution manufacture and storage steps from final product manufacture.

冷凍是用于在生物制藥產品的開發和生產期間維持藥物的穩定性和質量的常見工藝步驟。 人們普遍認為，通過將散裝原液生產和儲存步驟與終成品過程分離，冷凍藥物大限度地提高了生產率并降低了總體生產成本。

Freezing provides flexibility and cost savings by enabling batch processing: Large volumes of an expensive biological drug substance can be frozen in batches to allow the drug product to be manufactured based on real-time commercial or clinical demands. Freezing a drug substance before drug product manufacture also reduces microbial growth risk and eliminates mechanical (agitation) stresses during transportation.

通過批量處理，冷凍提供了靈活性、節約成本：可以批量冷凍大體積昂貴的原液，以允許基于實時商業或臨床需求來制造藥物產品。 在藥品生產之前冷凍藥物也降低了微生物生長風險并消除了運輸過程中的機械（攪動）壓力。

Most important, this allows for a longer shelf life. Freezing decelerates chemical degradation (because reaction kinetics depend directly on temperature) and physical degradation (immobilizing drug substance in a frozen matrix limits protein–protein interactions) (3–13). Furthermore, application of freeze–thaw processes extends to storage of process intermediates, allowing for longer hold steps between manufacturing operations. Although freezing is considered to be a conservative approach, frozen storage is one of the most efficient and reliable methods to minimize protein interactions with container–closures and extend the shelf life of biological products in solution-based formulations (13).

重要的是，這可以延長保質期。 冷凍減緩化學降解（因為反應動力學直接取決于溫度）和物理降解（固定藥物在冷凍基質中限制蛋白質間相互作用）（3-13）。 此外，凍融工藝的應用延伸到工藝中間體的存儲，允許制造操作之間更長的保持步驟。 雖然冷凍被認為是一種保守的方法，但冷凍儲存是有效和可靠的方法之一，可以大限度地減少蛋白質與容器封閉物的相互作用，并延長生物制品在溶液型配方中的保質期（13）。