Storage & Handling
17 entries.
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Dry ice and peptide samples: sublimation, carbon dioxide, and the pH shift nobody records
Dry ice is not an inert cold source. It fills a shipper with carbon dioxide, and a sample thawed from that atmosphere can reach a pH it was never formulated at.
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Sterile filtration of peptide solutions: membrane chemistry, adsorptive loss, and what passes through
A 0.22 µm filter is rated by pore size, but for peptides the membrane polymer matters more: what binds, what leaches, and how much never reaches the vial.
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Glass transition and collapse temperature: the thermal numbers behind lyophilized peptide stability
A lyophilized peptide cake is an amorphous glass. Two temperatures govern it: the collapse temperature during drying and the glass transition in storage.
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Stability programs and retest dates: where a lyophilized peptide's storage window actually comes from
A peptide vial's storage window is the output of a stability study, not an estimate. ICH Q1A defines how those studies are designed and what the date means.
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Container closure integrity: how vial seals are tested and what a leak actually costs
A vial's seal is a measurable variable, not an assumption: how leakage limits are defined, why dye ingress fell out of favor, and what headspace gas reveals.
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Elastomeric closures: extractables, leachables, and stopper chemistry in peptide vial storage
The rubber stopper is the most chemically complex part of a peptide vial. Elastomer formulation, coatings, and what actually migrates into the solution.
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Lyoprotectants and bulking agents: what else is in a lyophilized peptide vial
Mannitol builds the cake and sucrose protects the peptide. These are different chemical jobs, and the excipient that does one usually cannot do the other.
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Glass vial chemistry: borosilicate types, delamination, and what the container contributes to peptide stability
Type I borosilicate glass is not inert. A look at glass composition, silanol surface chemistry, delamination risk, and container effects on stored peptides.
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Temperature excursions and mean kinetic temperature: what transit conditions mean for peptide stability
A shipment that sat in a hot truck raises a kinetics question, not a binary one. Arrhenius behavior and mean kinetic temperature frame the excursion problem.
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Oxidative degradation in stored peptides: which residues go first, and what drives them
Oxidation is the most common storage-related degradation pathway in peptides, but it is not uniform. A look at susceptible residues and what drives them.
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Asparagine deamidation: the one-dalton degradation route that purity assays miss
Asparagine deamidation is the slowest-looking and most consequential peptide degradation route: a one-dalton mass shift that standard purity assays miss.
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Surface adsorption and peptide loss: container materials, low-concentration handling, and mass balance
Peptides adsorb to glass, plastic, and filter surfaces. At low concentrations this loss is large enough to distort analytical results. A look at the chemistry.
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Freeze-thaw cycles and peptide integrity: what happens at the molecular level
Each freeze-thaw cycle exposes a peptide to cryoconcentration, ice-interface adsorption, and pH shifts. This post covers the degradation mechanisms and how aliquoting practice is designed around them.
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Bacteriostatic water vs sterile water: the chemistry of peptide reconstitution
Bacteriostatic water contains 0.9% benzyl alcohol as a preservative; sterile water does not. This post explains what that difference means for peptide reconstitution chemistry, working stock stability, and analytical considerations.
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Storage Solvent Chemistry: Diluents for Research Peptides
The diluent — the solvent used to reconstitute a lyophilized research peptide — is not a neutral choice. It determines the rate at which the dissolved peptide degrades, the stability of the working stock, the…
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NAD+ in Research: Mechanism, Sirtuin Biology, and Storage Considerations
Nicotinamide adenine dinucleotide — NAD+ in its oxidized form — sits at the center of cellular metabolism and a body of aging-biology research that has expanded dramatically over the past decade....
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How to Properly Store Research Peptides: A Complete Guide
Best practices for storing lyophilized and reconstituted research peptides, including temperature guidelines, reconstitution tips, and common mistakes to avoid.