Overview of the Partnership
Merck KGaA — operating through its Sigma-Aldrich life science division — is one of Peptide Science Biochem's most important reagent and reference material suppliers, and a key distribution channel for select Peptide Science Biochem products in Western markets. The relationship spans two distinct dimensions: Merck as a critical upstream supplier of laboratory reagents and analytical standards, and Merck as a downstream distributor of Peptide Science Biochem building blocks to Sigma-Aldrich's vast global customer base.
Peptide Science Biochem's QC laboratories in Shanghai consume significant volumes of Merck/Sigma-Aldrich reagents on a daily basis. Every HPLC analysis performed in our QC laboratory uses Merck Lichrosolv HPLC-grade solvents (acetonitrile, methanol, water) or Fisher Optima equivalents. Our ICP-MS calibration standards are exclusively sourced from Merck's Certipur range and NIST-traceable SRM 3100 series. And the LAL reagent water used in our endotoxin testing programme — where water quality is critical to test validity — is the Lonza LAL Water specification, procured through Merck's life science distribution network.
Reagent Supply: What We Source from Merck
The scope of Merck/Sigma-Aldrich products used across Peptide Science Biochem's manufacturing, QC, and R&D operations is extensive. Key procurement categories include:
- HPLC solvents: Merck Lichrosolv HPLC-grade acetonitrile, methanol, and water (18.2 MΩ·cm Milli-Q systems also supplied by Merck Millipore) — consumed at approximately 200–300 litres per month across Peptide Science Biochem's analytical laboratories
- Analytical reference standards: Certified amino acid standards for AAA calibration (Sigma-Aldrich AAS18 amino acid standard solution), peptide reference standards for HPLC system suitability, and pharmacopoeial reference standards (USP, EP) sourced through Merck's pharmacopoeial distribution programme
- ICP-MS calibration standards: NIST SRM 3100 series single-element standards and Merck Certipur multi-element calibration solutions for elemental impurity testing per ICH Q3D(R2)
- Karl Fischer reagents: Hydranal Composite 5 and Hydranal Methanol Dry for potentiometric Karl Fischer moisture determination — a critical QC test for lyophilised peptide products
- Coupling and protecting group reagents: Select HATU, HBTU, HOBt, DIC, and other SPPS coupling reagents where Sigma-Aldrich offers research quantities not available through Peptide Science Biochem's own bulk synthesis lines
- Microbiology media: BD Difco Fluid Thioglycollate Medium (FTM) and Soybean-Casein Digest Medium (SCDM) for sterility testing per USP <71>
- Laboratory consumables: Merck Millipore filtration membranes (HAWP, PVDF), Milli-Q water cartridges, and Durapore membrane filters used throughout sample preparation workflows
Peptide Science Biochem benefits from a corporate account agreement with Merck that provides preferential pricing on high-volume consumable categories, a dedicated technical account manager based in Shanghai, and priority access to Merck's application specialists for troubleshooting analytical method issues. This relationship has been particularly valuable during regulatory submissions, where Merck's technical team has assisted Peptide Science Biochem in preparing ICH Q2(R1) method validation packages for novel analytical procedures.
Sigma-Aldrich Catalogue Listing & Market Reach
Through a product listing arrangement with Sigma-Aldrich's supplier programme, a selection of Peptide Science Biochem Fmoc and Boc amino acid building blocks are available for direct purchase through the Sigma-Aldrich online catalogue (sigmaaldrich.com). This arrangement — which effectively makes Peptide Science Biochem products available to Sigma-Aldrich's millions of registered customers worldwide — has been one of the most effective market access tools in Peptide Science Biochem's international growth strategy.
Currently, approximately 85 Peptide Science Biochem Fmoc amino acid products are listed in the Sigma-Aldrich catalogue, spanning standard L-amino acid building blocks, D-amino acid equivalents, N-methylated derivatives, and select unnatural amino acid building blocks. The products are listed under Peptide Science Biochem's own brand name and catalogue numbers, with a direct link to Peptide Science Biochem's technical documentation and COA database, giving customers full transparency about the source of supply.
This listing has been particularly impactful in North America, where many academic and industrial customers default to Sigma-Aldrich for research chemical procurement. Rather than competing with Sigma-Aldrich's own building block range (which is sourced from multiple manufacturers and is not always Peptide Science Biochem's direct competition), Peptide Science Biochem's listed products tend to occupy niches — exotic unnatural amino acids, speciality protecting group variants, isotopically labelled derivatives — where Sigma-Aldrich does not maintain stock from their own manufacturing network.
Technical Collaboration & Method Development
Beyond the commercial supply relationship, Merck's application scientists have provided Peptide Science Biochem with significant technical support in the development and optimisation of analytical methods. Highlights include:
- Assistance in developing a validated RP-HPLC method for the quantification of residual Fmoc-OSu (N-hydroxysuccinimide ester) in Fmoc amino acid products — a critical impurity that is difficult to detect by routine analysis but can interfere with SPPS coupling efficiency
- Support in validating Peptide Science Biochem's ICP-MS elemental impurity method to full ICH Q3D(R2) compliance, including spike recovery experiments, LOD/LOQ determination, and matrix effect assessment using Merck's certified reference materials
- Optimisation of Peptide Science Biochem's Milli-Q water system configuration to achieve consistently <0.5 ppb total organic carbon (TOC) — a requirement for LAL reagent water quality in endotoxin testing
- Application of Merck SeQuant ZIC-HILIC columns for HPLC analysis of highly polar peptides and amino acids that are poorly retained on conventional reverse-phase C18 columns
Peptide Science Biochem and Merck's life science team also collaborate on regulatory documentation. Several Peptide Science Biochem COA templates and analytical method summaries have been reviewed and technically validated by Merck's regulatory affairs specialists to ensure alignment with FDA and EMA supplier qualification expectations — providing Peptide Science Biochem customers who are pharmaceutical manufacturers with greater confidence in Peptide Science Biochem's documentation quality.