Practical Guide · Reconstitution

The dilution guide.

A laboratory-grade reference for reconstituting lyophilised peptides with bacteriostatic water — the protocol, the matrix, and the principles that preserve molecular integrity throughout.

For Research Use Only

The procedures and concentration tables below are provided strictly for in vitro research applications. Halcyon peptides are not approved for human or veterinary administration.

01 · Protocol

The reconstitution protocol.

  1. 01
    Preparation

    Bring the vial to room temperature.

    Remove the lyophilised peptide from cold storage and allow it to equilibrate to ambient temperature for 20 to 30 minutes. Visually inspect the vial — the powder should be intact and free from discolouration.

  2. 02
    Addition

    Introduce bacteriostatic water along the vial wall.

    Using a sterile syringe, slowly inject the calculated volume of bacteriostatic water (0.9% benzyl alcohol) down the inner wall of the vial. Direct contact with the powder bed should be avoided to preserve molecular integrity.

  3. 03
    Dissolution

    Allow the peptide to dissolve undisturbed.

    Do not shake, vortex, or otherwise agitate the solution. Permit dissolution to proceed passively over 5 to 10 minutes. If needed, gently swirl the vial — never invert or mix vigorously, as mechanical shear may denature the peptide.

  4. 04
    Storage

    Refrigerate the reconstituted solution.

    Once fully dissolved, store the reconstituted vial at 2 – 8 °C and use within 30 days. For extended storage, aliquot into single-use volumes and freeze at −20 °C to avoid repeated freeze-thaw cycling.

02 · Matrix

Concentration matrix.

Standard combinations of vial mass and diluent volume, producing the final concentrations researchers typically work with. Reference values, not prescriptions.

Vial5 mg
Diluent1 mL
Concentration5.0 mg/mL
Per 0.1 mL500 µg
Vial5 mg
Diluent2 mL
Concentration2.5 mg/mL
Per 0.1 mL250 µg
Vial5 mg
Diluent5 mL
Concentration1.0 mg/mL
Per 0.1 mL100 µg
Vial10 mg
Diluent1 mL
Concentration10.0 mg/mL
Per 0.1 mL1000 µg
Vial10 mg
Diluent2 mL
Concentration5.0 mg/mL
Per 0.1 mL500 µg
Vial10 mg
Diluent5 mL
Concentration2.0 mg/mL
Per 0.1 mL200 µg
Vial20 mg
Diluent2 mL
Concentration10.0 mg/mL
Per 0.1 mL1000 µg
Vial20 mg
Diluent5 mL
Concentration4.0 mg/mL
Per 0.1 mL400 µg
Values assume complete dissolution and standard 1 mL graduated insulin syringes (100 IU = 1.0 mL). For non-standard measurement systems, consult the conversion utility in the laboratory information management system.
03 · Reference

Additional notes.

01

Diluent Selection

Bacteriostatic water (0.9% benzyl alcohol) is preferred for multi-use vials. Sterile water for injection may be used where preservative-free conditions are required, with shorter post-reconstitution stability.

02

Sterile Technique

All reconstitution should occur in a Class II biosafety cabinet or laminar flow hood. Wipe all vial septa with 70% isopropyl alcohol prior to needle insertion.

03

Avoid Agitation

Peptides are susceptible to denaturation under mechanical shear. Never vortex; gentle inversion or rolling is acceptable only when passive dissolution is incomplete after 10 minutes.

04

Visual Inspection

Reconstituted peptides should appear as clear, colourless solutions. Any cloudiness, particulate matter, or discolouration indicates degradation and the vial should be discarded.

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