Peptide Storage Guidelines for Laboratory Research

The condition in which a research material is kept between receipt and use is an important factor in maintaining it in a predictable state. Lyophilised peptides are typically stable as dry powders, but even in this form, exposure to heat, light, moisture or repeated thermal cycling can influence how consistent the material is over time. The notes below describe general storage considerations for lyophilised research materials. They are not instructions for any use of a material, and the storage information provided with a specific material always takes precedence over any general guidance.

Recommended storage temperatures

Most lyophilised research peptides are stored at low temperatures. Many laboratories keep dry material at around −20°C for routine storage, with some materials specifying lower temperatures for longer-term retention. The storage condition stated on the product label and specification is the definitive reference for a specific material and should be followed from the moment the material is received.

Temperature monitoring

Storage equipment such as freezers benefits from periodic checking to confirm that the intended temperature range is being maintained. Recording temperature readings at regular intervals, or using a data logger, creates an ongoing record of the storage environment. This record is particularly useful when confirming that material has been held within its intended conditions. For information on how to respond when temperatures fall outside the intended range, see Temperature Excursion Management.

When a vial is removed from cold storage, it is common practice to allow it to reach approximately room temperature before opening, while the vial remains sealed. This reduces the risk of moisture condensing on cold material when the vial is opened in a warmer, humid environment. The time needed for this equilibration depends on the size of the vial and the temperature differential. Keeping the vial sealed throughout this period is important, as opening a cold vial prematurely is a common source of moisture exposure. The consequences of condensation and how to avoid them are covered in detail in Common Laboratory Storage Mistakes.

Protecting from light

Some research materials are sensitive to light exposure, and general good laboratory practice is to keep vials protected from prolonged exposure to ambient or direct light. Storing material in opaque containers or in enclosed freezer locations, and minimising the time spent handling material under bright conditions, is a straightforward protective step that adds no complexity to a storage workflow.

Moisture and desiccation

Dry lyophilised material should be kept dry. Storing material with a desiccant, or in environments with controlled humidity, helps limit moisture uptake over time. Resealing vials promptly after each access reduces the opportunity for ambient moisture to enter. A material that has absorbed moisture may take on a different appearance or behave differently during handling. For a thorough treatment of moisture control in laboratory storage, see Moisture Control in Laboratory Storage.

Storage decisions are best made before a material arrives. Knowing in advance which storage conditions are required, and ensuring the equipment and space are ready, means material can be placed correctly at the point of receipt rather than stored temporarily in an unsuitable environment. Planning ahead also reduces the number of times material is handled before finding a permanent location, which limits cumulative exposure and unnecessary freeze-thaw cycling.

Some laboratories divide material into smaller working aliquots at the point of receipt or first use, keeping the main stock undisturbed and limiting how often it is removed from storage. These decisions are made by the researcher based on their experimental requirements and knowledge of the material; the notes here are general considerations only.

Clear, durable labelling is essential for material held in storage. A label on a stored vial should identify the material unambiguously, carry the batch or lot number, and include relevant dates such as the date of receipt or, where applicable, the date of preparation of an aliquot. Labels intended for cold-storage use should adhere reliably at low temperatures, since a label that detaches inside a freezer creates a traceability gap regardless of how complete the written records are.

The label is the primary connection between a physical vial and its records. Maintaining that connection in storage is what makes it possible to confirm, at any point, what a vial contains and how it has been kept. General documentation considerations that accompany storage are covered in Laboratory Documentation Best Practices.

Every material we supply carries a storage condition as part of its specification. This information is provided on the product page and should be treated as the authoritative reference for that specific material. Available materials and their storage information can be viewed in the catalogue, and our general approach to material consistency is described on the Quality page.