A biological sample - whether blood, tissue, stem cells or a pharmaceutical intermediate - passes through a number of critical stages on its journey from living organism to long-term preservation and potential return to use. At each of these stages, errors can irrevocably affect the quality of the sample.
In this article, we follow a sample through its entire life cycle and show which cryotechnology makes the difference at which stage. This makes it clear why the quality of the overall process can only be as good as its weakest link - and why an integrated approach, such as that pursued by Consarctic®, is crucial.
The life cycle begins with the collection of the biological sample. Depending on the sample type, this can be a blood sample, a surgical biopsy or the harvesting of cells from a cell culture.
From the moment the sample is taken, the biological clock starts ticking. Enzymes begin to decompose the tissue, cells die and the sample quality decreases rapidly. The initial processing - isolation of the target cells, addition of culture medium or cryoprotectant - must therefore take place within a defined time window.
Cryogenic infrastructure is relevant even before freezing: Cool boxes and refrigerated centrifuges keep the sample at the optimum temperature during processing. A well-planned laboratory with efficient workflows minimizes processing time.
This stage is perhaps the most critical in the entire life cycle. This is where it is decided whether the sample will still be viable and functional after thawing.
A controlled rate freezer such as the BIOFREEZE® BV45 or the SMARTLINE enables precise control of the cooling rate. The TC-Active function automatically detects the moment of crystallization heat release and compensates for it by shock freezing - a key moment that determines the survival rate of the cells.
The entire freezing curve is recorded digitally: Temperature, cooling rate, duration, batch designation and operator. This data is part of the sample documentation and is essential for GMP-regulated processes.
After freezing, the samples must be quickly transferred to the long-term storage tank. This transfer is a moment of increased danger: every second outside the tank means a potential rise in temperature.
In this phase the sample is at rest - at -196°C practically all biological activity is suspended. Theoretically, samples can be stored indefinitely at this temperature. In practice, no measurable loss of quality has been observed after more than 25 years of storage.
When a sample is needed, it must be removed from the tank quickly and safely without endangering the surrounding samples. This is where the value of a well-designed cryo set-up system becomes apparent: Well-organized racks and cassettes allow targeted removal in seconds without exposing the entire tank contents to room temperature.
Thawing is the last critical moment. Most protocols require rapid thawing (e.g. in a 37°C water bath) to avoid the formation of recrystallized ice crystals. The cryoprotectant is then rinsed out and the cells are prepared for use.
The life cycle of a sample clearly shows that no single device alone can guarantee sample quality. It is the seamless interaction between the freezer, storage tank, transport container, monitoring system and service that makes the difference.
It is precisely this integrated approach that Consarctic® pursues as a full-service partner. From advice on selecting the right cryoproducts to 24/7 emergency service - we accompany your samples through every step of their life cycle.
Would you like to optimize your sample process? Contact our experts for a comprehensive analysis of your workflow and find out where there is potential for improvement.