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The effective storage of biological reagents is paramount to ensuring the integrity and reliability of experimental results. For researchers working with peptides, particularly the widely used 3X FLAG peptide, understanding proper handling and storage conditions is crucial. This article delves into the intricacies of storing 100 ug/mL 3X FLAG peptide, drawing upon established best practices and supplier recommendations to maintain its efficacy.

The 3X FLAG peptide, a synthetic polypeptide featuring three repeats of the DYKXXD amino acid sequence (commonly DYKDDDDK), serves as a vital tool in molecular biology. Its primary application lies in the competitive elution of FLAG-tagged proteins from affinity chromatography matrices, such as ANTI-FLAG® M1 and M2 resins. A frequently utilized working concentration for this purpose is 100 ug/mL (or 100 µg/mL, 100 µg/ml, 100ug/ml). Maintaining this concentration accurately requires careful consideration of the peptide's stability and appropriate storage protocols.

Optimal Storage Conditions for 3X FLAG Peptide

When dealing with 3X FLAG peptide, especially in its lyophilized powder form, several storage recommendations are consistently advised to prolong its shelf life and preserve its activity.

* Temperature is Key: For unopened, lyophilized powder, long-term storage at low temperatures is recommended. This typically falls within the range of -20°C to -80°C. Some suppliers specify -20°C for 1 year, while others suggest -80°C for up to 2 years. For instance, one prominent supplier indicates that the unopened product is stable for 1 year at –25°C to –15°C. Another recommendation is to store at -5 to -30°C. For shorter-term storage of the powder, -20°C is often sufficient.

* Refrigerated Storage: For prepared solutions, particularly those at a concentration like 100 ug/mL, refrigerated conditions are often preferred for immediate or short-term use. The storage temp of 2-8°C is frequently cited for this purpose, ensuring the solution remains viable for experiments conducted within a reasonable timeframe.

* Freezing and Aliquoting: To ensure the longevity of reconstituted 3X FLAG peptide, it is strongly advised to aliquot and store at -20°C in working volumes. This practice is critical to avoid repeated freezing and thawing cycles, which can degrade the peptide. For extended storage after reconstitution, some protocols suggest storing at –20°C in with 50% glycerol, which can further stabilize the solution. Another approach is to keep at –20°C in working aliquots. The general consensus among researchers is to store it in separate packages to prevent product failure due to freeze-thaw cycles.

* Environmental Factors: Beyond temperature, protecting the peptide from environmental degradation is vital. Sealed storage, away from moisture and light, under nitrogen is a common recommendation for maintaining the integrity of the lyophilized powder. Moisture can lead to clumping and degradation, while light exposure can also impact stability.

Preparing and Using 100 ug/mL 3X FLAG Peptide Solutions

When preparing solutions, using sterile water or a suitable buffer, such as PBS or Tris at an appropriate pH, is recommended. The solubility of the 3X FLAG peptide in sterile water is generally high, often exceeding 10 mM.

The 3X FLAG peptide is a synthetic peptide and a crucial component for researchers employing FLAG-tag or 3xFLAG peptide systems in their experiments. Its role in competitive elution is indispensable for releasing FLAG-tagged proteins from affinity resins. While a common starting point for the recommended working concentration is 100-150 µg/mL, some protocols may require optimization. Researchers might find that a concentration of 200-400 µg/mL is used for eluting DYKDDDDKTag fusion proteins from Anti-DYKDDDDK beads. The precise concentration needed can depend on the specific experimental setup and the affinity of the antibody used.

Understanding Search Intent and Related Searches

The information gathered from the search results highlights a clear intent to understand the practicalities of handling and storing the 3X FLAG peptide at a specific concentration. Terms like "2-8 °C," "100 µg," "mL," "storage," and "peptides" directly reflect this practical focus. The inclusion of "3X FLAG peptide," "polypeptide," and "Tag" underscores the specific nature of the compound being investigated.

Furthermore, phrases like "Aliquot and store at -20 °C," "stable for 1 year at –25°C~-15°C," "storage temp. 2-8°C,"