Lyophilization or freeze drying is a process in which water is removed from a product after it is frozen and placed under a vacuum, allowing the ice to change. For composing validation protocol of lyophilizer need to carry out its qualification test and. decide acceptance criteria. So during selection of. Hi all, I have a question regarding an OQ of a freeze dryer. Im Validation Manager in a medium size medical devices company and have the.

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System pressures in the mTorr to mTorr range will usually promote an adequate amount of convection. Several analytical methods are available for determining that primary drying is complete.

When working with products with low collapse temperatures, it may be necessary to wrap or insulate the flask to slow down the rate of heat transfer qualitication avoid collapse.

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About Our Trusted Brands. Additionally, the chamber must be L stainless steel. Manifold freeze dryers rely on ambient conditions to provide the heat of sublimation to the product. Sublimation is when a solid ice changes directly to a vapor without first going through a liquid water phase.

Unfrozen product may expand outside of the container when placed under a vacuum.

SP Scientific service professionals offer your organization a depth of expertise that is truly unique to our selected industries and markets. If renting bendable units, then they can be verified in our dry block temperature baths. Clamps, Gaskets and port caps are also available.


A suitable container system must be chosen for the product. Some amorphous products such as mannitol or glycine form a metastable glass with incomplete crystallization when first frozen.

Validation Equipment – Lyophilizer Qualifications

Freeze drying can be a multi-day process. The clean steam piping must be L stainless steel. This regulation requires certain standards of process control and security. Freeze drying occurs extremely qualivication at these cold product temperatures. A recommended approach is to first set the system pressure using the vapor pressure of ice table.

At mid-cycle, the pressure and average temperature of the chamber indicate that the steam is saturated.

Basic Principles of Freeze Drying

Another tool is available with freeze dryer designs that have external condensers. NPT Thread to 1. It is good practice to characterize the collapse temperature for all new injectable or ingestible drug formulations to be freeze dried.

One such method entails comparison of parallel pressure readings between a Pirani gauge and a capacitance manometer. Freeze dryer refrigeration designs are available to provide the lower shelf and condenser temperatures needed to freeze and then condense some organic solvents.

Purified Water System OQ. The resources are truly invaluable and appreciated.

For this reason, production freeze dryers are designed with metal doors and small view ports. This is the water that is removed desorbed during secondary drying. Slower shelf cooling rates do not necessarily yield larger ice crystals because of the effects of super-cooling.

In addition to designing a recipe that successfully dries a product, it is also extremely valuable to optimize lgophilizer the length of the cycle, especially if there is potential for process repetition or scale-up for production. Shelf temperature accuracy and qualificqtion testing. Performance Qualification Acceptance Criteria Sterilization Bacillus stearothermophilus biological indicators are such that the product of the ‘D’ value and the log of the population is at least 6 e.


If drying in vials, it is good practice to insert the thermocouple in a vial located in the middle of the shelf. The refrigeration system can also be employed to cool shelves in the product chamber for the freezing of the product. Option to use your own thermocouples, or purchase thermocouples ready to go from Ellab. With SP Scientific your solution is just a call or an e-mail away.


SP Scientific associates and distributors look forward to helping you reach your goals. More advanced shelf freeze dryers have freezing capability built into the product shelf which allows the product freezing to be accomplished inside the freeze dryer.

Our unit works with passing the thermocouple straight through the rubber compression materials. Verifying rigid units needs to take place in a liquid bath. It is not recommended to arbitrarily and repetitively increase the qualificatoin temperature during primary drying, as is seen on some older legacy cycles.

This valve can be closed for a short period of time and the subsequent rise in pressure in the product chamber can be measured.