HG Frag 176-191 Synthetic Peptide Lyophilized Powder 98% Purity Laboratory Research Grade

• • Intended Use

    
    
    This product is a lyophilized synthetic peptide for in vitro laboratory research only. It is exclusively intended for use in controlled scientific environments, including biochemical analysis, cell-based assays, peptide structure–function studies, signal pathway investigation, and other basic research applications. Not for human, veterinary, or clinical use. Not for  ingestion, or any form of administration to living organisms.
    
    

    General Handling Precautions

    
    
    • Work in a sterile, low-dust laboratory environment; use a laminar flow cabinet if available.
    • Wear lab coat, nitrile gloves, safety goggles, and a dust mask at all times.
    • Avoid direct skin contact, inhalation of powder, or accidental ingestion.
    • Equilibrate sealed vials to room temperature (15–25°C) before opening to prevent moisture condensation and peptide deliquescence.
    • Keep exposure to ambient air as brief as possible; the peptide is hygroscopic and sensitive to oxidation.
    • Use sterile tools and containers throughout preparation to avoid microbial or endotoxin contamination.
    
    

    Reconstitution (Dissolution) Protocol

    
    

    Recommended Solvents

    
    
    • Bacteriostatic Water (BAC Water) – preferred for repeated sampling; contains benzyl alcohol as preservative.
    • Sterile Water  – for single-use, sterile applications.
    • Phosphate-Buffered Saline (PBS, pH 7.2–7.4) – for biological assays and cell culture work.
    
    

    Step-by-Step Reconstitution

    
    
    1. Prepare workspace: Wipe bench with 70% isopropyl alcohol; allow to dry completely.
    2. Sanitize stoppers: Use separate sterile alcohol swabs to clean the rubber stoppers of both the peptide vial and solvent vial; air dry 10–15 seconds.
    3. Draw solvent: Using a sterile syringe, withdraw the required volume of solvent (e.g., 2 mL for a 5 mg vial).
    4. Slowly along the wall: Direct the solvent gently down the inner glass wall of the peptide vial over 15–20 seconds; do not directly onto the lyophilized cake to avoid foaming and peptide denaturation.
    5. Dissolve by gentle swirling: Allow the vial to rest 1–2 minutes, then swirl slowly and continuously for 30–60 seconds until fully dissolved. Do NOT shake, vortex vigorously, or agitate harshly.
    6. Inspect clarity: The final solution should be clear to slightly opalescent, free of visible particles, precipitate, or turbidity.
    7. Label immediately: Record peptide name, lot number, concentration, reconstitution date, and operator initials.
    
    

    Typical Concentration Example

    
    
    • 5 mg lyophilized powder + 2 mL solvent = 2.5 mg/mL (2500 mcg/mL) stock solution.
    
    

    Aseptic Aliquoting & Laboratory Dispensing

    
    
    • After reconstitution, maintain sterility by working in a laminar flow hood.
    • Divide the stock solution into small, sterile microcentrifuge tubes or vials to avoid repeated freeze–thaw cycles.
    • Label each aliquot with concentration, date, and expiry.
    • Use only sterile pipettes, tips, and syringes for transfer; avoid cross-contamination.

• Storage Conditions

  
  

  Lyophilized Powder (Unopened)

  
  
  • Long-term: –20°C or –80°C, sealed, dry, dark, with desiccant; stable for 36 months.
  • Short-term (≤4 weeks): 2–8°C, refrigerated, sealed, protected from light.
  • Transport: Ambient temperature (≤25°C) acceptable for short transit; avoid prolonged heat or direct sunlight.
  
  

  Reconstituted Solution

  
  
  • Refrigerated (2–8°C): Stable for 7–14 days (BAC water up to 28 days).
  • Frozen (–20°C): Stable for 3–6 months; avoid repeated freeze–thaw.
  • Protect from light: Store in amber tubes or wrapped in foil to prevent photodegradation.
  
  

  Stability & Quality Notes

  
  
  • This peptide contains cysteine residues, making it susceptible to oxidation; minimize air exposure and purge headspace with nitrogen/argon before long-term storage.
  • High temperature, humidity, and repeated freeze–thaw will accelerate degradation and reduce purity.
  • Always verify solution clarity before use; discard if cloudiness, precipitate, or discoloration appears.
  
  

  Disposal

  
  
  • Dispose of all waste materials (powder, solution, used vials, syringes) in accordance with local laboratory hazardous waste regulations.
  • Do not pour liquid waste into drains without proper treatment.
  
  

Core Business & Product Portfolio

• Therapeutic peptides: SS-31 (Elamipretide), Tirzepatide, Semaglutide, Retatrutide (RT20), etc.
• Functional peptides: GHK-Cu, TB500, KPV, NAD, Glutathione, etc.
• Custom peptide services: Custom synthesis of complex sequences, long-chain peptides (up to 200 amino acids) and cyclic peptides, as well as various modification services (N-methylation, unusual amino acid incorporation, etc.).

R&D & Manufacturing Strength

• Technical expertise: Mastery of core technologies including solid-phase peptide synthesis (SPPS), liquid-phase synthesis, advanced purification (HPLC) and strict structural characterization.
• Quality assurance: All products are produced in compliance with cGMP standards, with complete CoA, HPLC and MS reports to ensure batch-to-batch consistency and high purity (≥98%).
• Production capacity: Equipped with professional production bases in Guangzhou, supporting small-batch R&D samples to large-scale commercial production, with stable supply capacity.

Global Market & Service Philosophy

Vision