Where can I purchase microfluidic chips for LNP encapsulation of mRNA vaccines through price comparison?

Large price differences usually come from precision and test reports. When comparing quotes, require suppliers to provide: channel roughness or dimensional tolerances, pressure test methods and measured values, whether leak testing is performed, whether batch COC/COA is available, and whether cleanliness or endotoxin reports are provided. For glass chips, also ask whether annealing/chemical strengthening is performed, and for COC, check whether medical-grade raw materials are used. A 5-10 mL batch is small, but LNP is sensitive to mixing uniformity, so it is not advisable to look only at the unit price per chip; compare the overall cost of "sample volume producible per chip + batch consistency + after-sales debugging." You can have the supplier first perform a small-sample trial encapsulation before deciding whether to scale up.

For glass and COC chips, the key considerations are your formulation solvent and pressure. When the ethanol/organic phase ratio is high, glass offers better solvent resistance and dimensional stability, making it suitable for repeated use; however, glass is brittle, so care must be taken during disassembly and cleaning, and the price is also relatively high. COC is more suitable for single-use or small-batch applications, and its pressure resistance is usually sufficient for microfluidic mixing, but you need to confirm with the supplier its tolerance to solvents such as ethanol and PEGylated lipids, as well as whether the sealing method will leak under high pressure. For your 5-10 mL per batch, first determine the total flow rate and mixing ratio, then ask the manufacturer to provide the pressure resistance curve at that channel depth, rather than just looking at the upper limit stated for the material.

It is advisable not to purchase by the full batch initially; ask the supplier whether they can provide a trial sample of 2–5 chips or small-batch customization. During small-batch trials, focus on three things: first, whether continuous operation under organic solvents causes swelling or leakage; second, whether the particle size and PDI after mixing are stable and how they compare with your existing method; third, whether the chip can be reused after disassembly and reassembly, and whether cleaning residues affect the next batch. Regarding lead time, standard off-the-shelf chips are generally faster than custom ones, but customization may take 2–4 weeks; if the supplier says it can be done, be sure to confirm the minimum order quantity and engineering fee. Some domestic companies doing microfluidic contract manufacturing for medical devices are more accommodating with small batches than pure research-oriented machining providers, so they can be contacted first.

When comparing prices, don't just search for "microfluidic chips." You can inquire through three types of channels: first, manufacturers of LNP preparation equipment, which usually offer matching chips or chips compatible with standard interfaces; second, domestic microfluidic chip foundries, which can quote based on your existing fixture/interface drawings; third, small-batch processing services from research consumables platforms or university microfabrication platforms. When requesting quotes, provide the same drawing and operating conditions to everyone: flow rate range, solvent, target mixing ratio, channel dimensions, and pressure resistance requirements. Ask them to specify in their quotes the material, sealing process, surface treatment, and whether fixtures and connectors are included. Only then will the price differences be comparable.