N-1 灌流

N-1 灌流是种子扩增强化的一种形式，是指在生产生物反应器 (N) 之前种子扩增步骤 (N-1) 中的细胞生长强化，可实现更快速更稳定的工艺，同时保持现有的补料分批生产方案。

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N-1 perfusion is done by attaching a cell retention device, such as the XCell ATF^® Device, to the N-1 bioreactor to attain high cell density and viability. This seeds the N production bioreactor at a higher starting cell density and shortens the production bioreactor run time. The process dramatically increases facility output without direct change to the core Fed-Batch production process. A robust cell retention device is required to attain a high cell density inoculum for the production bioreactor.

The combination of implementation ease and productivity increase makes N-1 perfusion the most frequent starting point for upstream intensification. Once in place, further intensify the seed train by adding High Productivity Harvest (HPH) to the N bioreactor or transition to continuous.

Repligen solutions help overcome key challenges in N-1 perfusion, with hands-on process and implementation consultation from global Field Applications Specialists.

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N-1 Perfusion Cell Culture Workflow

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提高吞吐量，节省时间

N-1 perfusion intensifies the Fed-Batch process, increasing facility throughput. Seeded at a higher initial density, cells in the N bioreactor grow faster, reach a higher max VCD and produce more product than traditional Fed-Batch. Harvest sooner and increase the number of batches per year as compared to a standard Fed-Batch process. Alternatively, maintain the N bioreactor run time to increase overall yield.

Maintain a Fed-Batch process

N-1 perfusion intensification increases N bioreactor productivity and throughput while maintaining a Fed-Batch process. No perfusion or media exchange of the N bioreactor is required, allowing the N bioreactor to maintain a single and discreet Fed-Batch harvest point.

Minimize validation impact

以最低的工艺修改和监管文件编辑而实现强化。N生物反应器不需要连接附加设备，生产过程中没有培养基置换，且细胞活性更高，通常杂质值也相应地更低。

N Bioreactor reached 350 x 10⁶ VCD

N-1 perfused Fed-Batch reached 350 million cells/mL VCD in just 6 days. In comparison, standard Fed-Batch achieved 30 million cells/mL viable cell density (VCD) over a course of 14 days. Productivity of the N bioreactor with N-1 perfusion increased 20X while maintaining viability above 90%.

Higher cell density and viability

10X VCD over Fed-Batch
VCD as high as 350 x 10⁶ cells/mL
生产时间降低50%
20X increase in productivity
更低的产品成本

N-1 Perfusion increased VCD 10X, reduced production time by 50%

The perfused N-1 bioreactor cell density rapidly increased from 8 to 80 million cells/mL (10x VCD) in 4-5 days. Inoculation of the N bioreactor with the N-1 perfused culture established a 10X higher initial viable cell density over Fed-Batch (A). After 3 days, the N-1 inoculated bioreactor achieved 35 million VCD. In comparison, the control required 6 days to achieve 25 million VCD (B).

Leverage higher VCD to either increase throughput or increase yield. Harvest of the N-1 Fed-Batch bioreactor at day 8 was equivalent to harvesting the Fed-Batch control at day 14, saving 6 days of N bioreactor suite time (C). Alternatively, harvest the N-1 Fed-Batch process at day 14 for a 25% overall yield increase.

N-1 bioreactor reached 10X VCD in 4-5 days
N-1 perfused Fed-Batch bioreactor reached maximum VCD of 35 million compared to 25 million with traditional Fed-Batch
Maximum VCD was achieved 3 days earlier
提前6天收获相同的产量，或者
运行14天，产量提高25%