How to Store Lyophilised Peptides

How Lyophilized Peptides Are Stored

Storage is an essential aspect of keeping research samples intact in laboratory conditions. While peptide synthesis and analysis play a role in ensuring that products are of quality, correct storage methods ensure that quality is retained over time even before and during use in the laboratory.

Many research peptides come in a lyophilized form since lyophilization gives the peptide formulation more stability compared to a liquid sample during storage and transportation. Knowledge of lyophilized peptide storage will help minimize the destruction of research products caused by various environmental conditions.

The purpose of this guide is to provide detailed insight into lyophilization, its significance in the research of peptides, the conditions under which peptides should be stored, issues related to storing peptides, and mistakes that can be made while doing so. This guide is not meant to replace the instructions provided by the manufacturer.

What Is Lyophilization?

Lyophilization, otherwise referred to as freeze-drying, is a preservation technique whereby water content is removed from a substance without altering its structure significantly.

The steps involved in the process include:

• Freezing – In this stage, the peptide solution is subjected to low temperatures in order to form ice crystals within the substance.
• Primary drying – This is done under vacuum whereby the frozen water is removed from the substance through sublimation.
• Secondary drying – This step is conducted with the purpose of reducing residual moisture in the finished substance.

The end product is a dried substance with very low water content. Since water is one of the main catalysts for degradation reactions, it may be useful to remove it from many types of peptides.

Freeze drying is an extremely common technique in the production of drugs and other biological products due to the fact that it provides a better storage option than most liquids.

Why Peptides Are Lyophilized

Many peptides used in research studies are available in the form of lyophilized peptides since the process has many benefits in terms of storage and shipment.

These include:

• Stability enhancement: The absence of water helps decrease the rate of many degradation reactions, thus assisting in preservation of the structure of the peptide.
• Transportation benefits: Freeze dried substances tend to be lighter and not as vulnerable to change while transported as compared to aqueous solutions.
• Hydrolysis prevention: Water plays a role in hydrolysis, which is a chemical process that could lead to alteration of peptide molecules. The lyophilization process helps eliminate this factor.
• Potential for long-term storage: In accordance with the recommended storage method, lyophilized peptides may be more stable than similar liquid formulations. This depends on factors like the specific composition of the peptide, its formulation, packaging, and storage conditions.
• Flexible preparation in laboratories: Researchers can prepare lyophilized substances according to the individual needs of the laboratory when needed, instead of keeping the solution in storage for prolonged periods.

Recommended Storage Conditions

Proper storage conditions for peptides play a role in minimizing environmental elements that can influence the integrity of the peptides.

Temperature

The temperature is one of the most influential factors when it comes to peptide stability. Most labs store lyophilized peptides in refrigerated or frozen environments as per their specific nature.

Laboratory guidelines include:

• Storage at the recommended storage temperature by the manufacturer.
• Checking the conditions in which storage is carried out.
• Minimizing changes in temperature levels.
• Storing the materials back as soon as possible after usage.

Storage temperatures vary with different aspects such as the nature of the peptide, intended storage period, etc.

Protection from Light

Some peptides could be susceptible to long periods of UV radiation or high light exposure.

For minimizing light exposure, laboratories normally:

• Store products in the same containers in which they were delivered.
• Employ dark or opaque packaging when applicable.
• Reduce time under bright lab lights.
• Ensure that containers are always tightly sealed.

Each peptide is susceptible to light exposure in different amounts, thus requiring specific information.

Moisture Control

Moisture content is one of the key elements affecting the storage of peptides. Even though lyophilized substances have very little moisture content, exposure to moisture can occur following the opening of packaging. Moisture exposure can be minimized through laboratory practice by:

• Sealing the container properly.
• Opening the container only when necessary.
• Minimizing exposure to moisture in the air.
• Placing back the material in recommended storage immediately after opening.

Maintaining a dry environment for storage will help preserve the properties of freeze-dried peptide powders.

Handling Considerations

The correct handling of freeze-dried peptides is a critical part of laboratory quality control procedures. Scientists need to be careful in the handling of their peptides to minimize contamination of their samples during experimentation.

Handling tips include:

Checking the Documentation First

Read the certificate of analysis (COA) along with the storage conditions and other specific instructions provided for your product.

Label Materials Clearly

Containers in the laboratory should be properly labeled with information including the following:

• Product Name
• Batch Number
• Date Received
• Date Opened
• Storage Location

Minimize Environmental Exposure

Wherever possible, minimize the time containers are exposed to the laboratory environment.

Use Proper Laboratory Apparatus

Proper handling of these materials should be done using proper laboratory apparatus.

Documentation

Maintaining records on how these materials are stored, inventory, and usage is essential for reproducibility.

Factors Affecting Peptide Stability

There are several factors that affect the stability of peptides during storage.

• Peptide sequence: Various peptide sequences possess varying chemical characteristics, and hence some of the peptides are inherently stable compared to others.
• Temperature: Higher temperature may facilitate faster degradation of some peptides.
• Humidity: Moisture may lead to the hydrolysis of some peptides.
• Oxygen: The presence of oxygen can affect some peptides whose amino acids are highly susceptible to oxidation.
• Light: Some structures of peptides might be more prone to photochemical breakdown when subjected to light for an extended period.
• Duration of storage: Under optimal conditions, long periods of storage might affect the stability of peptides. It is important for researchers to consider what the manufacturer suggests in relation to duration of storage and quality assessment.
• Packaging: Packaging will help to shield peptide substances from any environmental exposure.

Storage Errors to Avoid

Some common methods of storage might result in poor quality or consistency of the laboratory materials.

• Temperature changes: Continuous exposure to changing temperatures between storage and room temperatures can subject materials to undue stress from the environment.
• Opening containers: Opening the container can allow absorption of atmospheric moisture.
• Improper labeling: Absence or incorrect labels can make it hard to track batches and storage history and duplicate experiments.
• Not following manufacturer guidelines: General storage guidelines should not be used in place of those given by the manufacturer.
• High humidity storage: High humidity levels can affect freeze-dried substances after opening containers.
• Direct sun exposure: The risk of degradation caused by light will be increased when the peptide materials are exposed to the direct sunlight or intense light.
• Bad inventory control: The lack of proper laboratory documentation will result in confusion about batch, storage, or expiration.

Conclusion

Lyophilization is a well-known process of preserving materials which enables researchers to have their peptides preserved in stable and dry forms for use in laboratory experiments. Storage conditions such as proper temperatures, protection from light sources, handling of moisture and proper recording of information are some of the factors that contribute to the quality of research materials.

Although freeze-drying may enable many peptide molecules to exhibit better storage properties, there are several elements that influence stability and they include the structure of the peptides, environment, packaging and period of storage.

References

1 source

1. 1
   PubMed — lyophilisation and stability of peptidesPubMed: https://pubmed.ncbi.nlm.nih.gov/?term=peptide%20lyophilization%20stability%20storage

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