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Articles from the Molekula editorial team
Coverage of chemistry, regulatory updates, methods, supply-chain insight, and product spotlights. New articles published daily.
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Applications
Sodium chloride in cell-culture media and physiological buffers
Sodium chloride (NaCl) is a critical electrolyte in cell-culture media and physiological buffers, typically present at 137–140 mM. It maintains osmotic balance, supports ion transport, and stabilises protein structure. High-purity grades (ACS, USP, EP) are required for cell culture, with endotoxin levels < 0.1 EU/mL. Reagent-grade NaCl is unsuitable for biological applications.
Jun 18, 2026 · 4 min read -
Applications
EDTA Chelation Chemistry and Applications Across Biology, Food and Analytical Chemistry
EDTA (ethylenediaminetetraacetic acid, CAS 60-00-4) is a versatile chelating agent used extensively in biological, food and analytical systems. It forms stable complexes with divalent and trivalent metal ions (e.g., Ca²⁺, Mg²⁺, Fe³⁺), with stability constants (log K) ranging from 10.3 to 18.6. Applications include enzyme inhibition, food preservation, and metal ion standardisation in analytical methods.
Jun 15, 2026 · 5 min read -
Applications
Common Buffers for Protein Purification: HEPES, Tris, PIPES, and MES
HEPES, Tris, PIPES, and MES are widely used buffers in protein purification due to their stability, buffering capacity near physiological pH, and compatibility with downstream applications. HEPES (pKa 7.5) is preferred for long-term stability; Tris (pKa 8.1) is cost-effective but can degrade; PIPES (pKa 6.8) and MES (pKa 6.1) are suitable for lower pH applications. All are available in high-purity grades (ACS, USP, EP) with certified CoA and SDS.
Jun 13, 2026 · 4 min read -
Applications
Uses of DTT (dithiothreitol) in proteomics and SDS-PAGE sample preparation
DTT (dithiothreitol, CAS 3483-12-3) is a reducing agent essential in proteomics and SDS-PAGE sample preparation. It breaks disulphide bonds in proteins, preventing aggregation and ensuring complete denaturation. Typically used at 1–5 mM final concentration, DTT is preferred over β-mercaptoethanol due to its lower odour and higher stability. It is compatible with downstream applications including mass spectrometry and ELISA.
Jun 8, 2026 · 4 min read -
Applications
Cryopreservation Buffers and Stabilisers: Key Components for Biological Sample Integrity
Cryopreservation buffers and stabilisers are essential for maintaining the structural and functional integrity of biological samples during freezing and thawing. Key components include cryoprotectants (e.g., DMSO, glycerol), buffering agents (e.g., HEPES, Tris), and stabilising excipients (e.g., sucrose, trehalose). Optimal formulations depend on cell type, storage duration, and downstream application. Standardised protocols using validated reagents ensure reproducibility and compliance with ISO, GHS, and USP/EP/BP guidelines.
Jun 7, 2026 · 6 min read -
Applications
Pharmacopoeia Grades (USP/EP/BP): What They Mean for Procurement
Pharmacopoeia grades (USP, EP, BP) denote substances meeting strict quality, purity, and testing standards for pharmaceutical use. Procurement teams must verify compliance with relevant monographs, ensure traceable CoA and SDS, and confirm batch consistency. These grades are essential for regulatory submissions and clinical trial material sourcing.
May 29, 2026 · 5 min read