How to reconstitute peptides

Technical guide to dissolving a lyophilized peptide with bacteriostatic water: materials, step-by-step procedure, common mistakes and storage at 2-8 °C. Note: informational and research material. Always consult a professional before handling any substance.

Materiales necesarios

Everything must be clean and sterile before starting.

  • Lyophilized peptide vial
  • Agua bacteriostática (BAC)
  • Insulin syringe (29-31 G)
  • Isopropyl alcohol wipes

Key handling data

Reference parameters for preparing and storing the vial.

  • Storage — 2-8 °C, refrigerado
  • Estabilidad reconstituido — 3-4 semanas
  • Typical BAC volume — 1-2 mL per vial
  • Diluyente recomendado — Agua bacteriostática (alcohol bencílico 0.9%)

Procedimiento paso a paso

  • 01 Preparar materiales — Gather the lyophilized peptide vial, bacteriostatic water, insulin syringes and alcohol wipes. Make sure everything is clean and sterile.
  • 02 Clean the vial — Clean the rubber cap of the vial with an alcohol wipe and let it dry for about 30 seconds before inserting the needle.
  • 03 Extraer el agua bacteriostática — With the syringe, draw the desired volume of bacteriostatic water. For most vials, 1-2 mL is enough. Check the calculator for the exact concentration.
  • 04 Inject slowly into the vial — Insert the needle and inject the water SLOWLY down the side of the vial, letting it run down the wall. Never inject directly onto the lyophilized powder.
  • 05 Permitir la disolución — Let the vial rest for 5-10 minutes so the peptide dissolves gradually. Do NOT shake; swirl it gently if necessary.
  • 06 Almacenar correctamente — Once reconstituted, refrigerate the vial at 2-8 °C. Most reconstituted peptides remain stable for 3-4 weeks under refrigeration.

Errores comunes

  • Shake the vial vigorously — Mechanical stress can denature the peptide and reduce its integrity.
  • Inject water directly onto the powder — The direct stream can damage the structure of the lyophilized compound.
  • Not cleaning the cap with alcohol — It introduces contaminants that can degrade the solution.
  • Store at room temperature — The reconstituted peptide degrades rapidly outside 2-8 °C.

Best practices

  • Never shake the vial: mechanical stress can denature the peptide.
  • Inject the diluent down the side of the vial so as not to damage the lyophilized powder.
  • Protect from light: some peptides are photosensitive; store them in the dark.
  • Calculate the exact concentration per vial with the reconstitution calculator.
  • Verify the purity with the per-batch verifiable COA of each EXOMA vial.

FAQ

How much bacteriostatic water to use to reconstitute a peptide?

The volume depends on the peptide and the desired concentration. For many 5 mg vials, 1-2 mL of bacteriostatic water is used. Use our reconstitution calculator to determine the exact amount for your workflow.

How long does a reconstituted peptide last?

Reconstituted correctly with bacteriostatic water, it remains stable for 3-4 weeks refrigerated at 2-8 °C. Without refrigeration it degrades within hours. Never freeze an already reconstituted peptide.

Can distilled water be used instead of bacteriostatic?

It is not advisable for multiple-draw use. Bacteriostatic water contains 0.9% benzyl alcohol that inhibits bacterial growth. Sterile water is only suitable for immediate single-draw use.

How to tell if a reconstituted peptide has degraded?

Signs of degradation: cloudy solution or one with visible particles, color change or unusual odor. At any of these signs, discard the vial.