QSC Peptide Lab documents the synthesis, validation, and quality control methodology behind every compound produced by Qingdao Sigma Chemical. 75+ compounds. ≥99% HPLC purity. Janoshik-verified COA. Domestic shipping from 8 regions.
QSC peptides are produced via Fmoc SPPS — the gold-standard method for synthesising research-grade peptides. Each amino acid residue is coupled sequentially to a solid resin support under controlled temperature and atmosphere.
Post-synthesis, each batch undergoes resin cleavage, side-chain deprotection, and purification via reverse-phase HPLC before lyophilisation. The resulting lyophilised powder is stable for extended storage and reconstitutes cleanly in bacteriostatic water.
QSC maintains both in-house synthesis capability and a vetted partner synthesis network, allowing scale flexibility across the 75+ compound catalogue without compromising quality control.
Full Manufacturing Process →C-terminal amino acid attached to solid-phase resin support. Fmoc protection scheme selected for optimal side-chain compatibility.
Each residue coupled via activation with HATU/DIPEA. Coupling efficiency monitored per cycle using Kaiser or chloranil tests.
TFA-based cleavage cocktail removes peptide from resin and strips side-chain protecting groups simultaneously.
Crude peptide purified by reverse-phase HPLC to ≥99% purity. C18 column, gradient elution, UV detection at 220nm.
Purified peptide freeze-dried to stable powder. Final batch undergoes independent HPLC + MS testing before COA issuance.
Every QSC batch is validated by two independent analytical methods before release.
Reverse-phase HPLC with C18 column quantifies relative peak areas. QSC specification: target compound ≥99% of total UV-absorbing species at 220nm.
HPLC methodology →ESI-MS or MALDI-TOF confirms molecular weight matches theoretical value. Identity confirmation eliminates batch substitution risk.
MS verification →All COAs issued by Janoshik Analytical Laboratories — an independent third-party testing provider trusted across the research peptide community. Results are publicly verifiable.
Verify a COA →All synthesised or partner-sourced to ≥99% HPLC purity. Click any compound for specifications and ordering information.
QSC maintains domestic fulfilment warehouses in 8 regions, enabling local delivery for most research institutions worldwide.
Domestic US warehouse. Standard and expedited delivery nationwide.
EU domestic warehouse. Covers most EU member states.
UK-based fulfilment. No customs friction post-Brexit.
Canadian domestic warehouse. Nationwide coverage.
Australian warehouse for domestic fulfilment.
Singapore hub serving Southeast Asia regionally.
Thailand domestic warehouse and regional node.
Vietnam domestic fulfilment centre.
Technical questions about QSC manufacturing, purity validation, and compound ordering.
75+ compounds. ≥99% HPLC purity. Janoshik COA. 8-region domestic shipping. BTC/USDT accepted.
RESEARCH USE ONLY. All compounds listed are for laboratory research purposes only. Not for human consumption, veterinary use, or diagnostic use. QSC Peptide Lab (qscpeptidelab.com) is an official information and science resource for Qingdao Sigma Chemical Co., Ltd. The QSC store operates at qscpeptide.com.