MOTS-c, 16 residues from mitochondrial 12S rRNA, mass 2174.6. Lot MOTS10-0803 line by line, and the handling its two methionines demand.
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Melanotan-1 is [Nle4, D-Phe7]-alpha-MSH, mass 1646.9. Lot MT110-0318 line by line, micromoles in 10 mg, handling, and its status as an approved drug.
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Deionized, distilled, Water for Injection, sterile water, bacteriostatic water, saline and bacteriostatic saline: what each is and which to use.
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Humanin, 24 residues from mitochondrial 16S rRNA, mass 2687.2. Lot HUM10-0803 line by line, and the handling its cysteine and leucines demand.
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A certificate purity is the main peak area over total area at 214 nm. What that ratio assumes, why it is not a weight percentage.
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Moisture, light, heat and freeze-thaw damage a stored vial. When desiccant helps, when amber matters, which tubes to use, and the one freezer rule.
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Tandem MS reads a fragment ladder, Edman reads one residue at a time, amino acid analysis counts residues. What each proves and what a mass cannot.
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From horseshoe crab blood to recombinant factor C: the three LAL readouts, USP 85 and 86, and what a limit of 0.05 EU/mL on a certificate means.
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CJC-1295 without DAC, modified GRF (1-29), mass 3367.9. Lot CJC10-0803 line by line, why the mass separates it from sermorelin and the DAC form.
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ARA-290 (cibinetide), eleven residues from erythropoietin helix B, mass 1257.1. Lot ARA2901-0803 line by line, the pyroglutamate arithmetic.
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A peptide in a tube sits partly in the liquid and partly on the wall. How much is lost, how fast, and what a low-bind tube actually fixes.
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These certificates carry two dates: sample received and report issued. What the gap between them reveals about which tests were actually run.
Read the post →The blog covers buying, handling and research-design questions as they come up. The evergreen material lives in the guides: reading a certificate of analysis, storage and stability, one research guide per compound and the glossary.
New posts publish to the RSS feed. Every post is written for laboratory research use only and links to the lot certificate for any product it mentions.
One email when a new certificate is published, when a sold-out compound is back, or when a new compound is added. About twice a month, nothing else.