Description
Trimethoprim is a high-purity reagent for biochemistry, supplied at a minimum purity of 99 %. The compound has the empirical formula C₁₄H₁₈N₄O₃, a molar mass of 290,32 g/mol, CAS number 738-70-5 and EG number 212-006-2. The defined purity and molecular data support reproducible work in biochemical research, method development and routine assay preparation where a consistent grade is required. Offered by manufacturer Carl ROTH for biochemistry use, the material fits protocols that specify trimethoprim as a discrete chemical identity with documented assay. The glass primary packaging protects the contents during storage and handling and allows straightforward transfer on the bench. Laboratories can incorporate the stated molar mass and empirical formula directly into calculations for buffers, media and experimental mixtures. With its clear specification set—minimum 99 % purity, CAS 738-70-5 and C₁₄H₁₈N₄O₃—this trimethoprim grade is a practical choice for controlled biochemical applications that demand reliable identity and purity.
This article is part of Organic building blocks & synthesis reagents, in Organic chemicals & synthesis reagents.
Key features
- Appearance: white to pale yellow powder
- Assay (titr.): ≥99.0 %
- Melting point: ≥199.0 °C
- Impurities, total: ≤0.2 %
- Heavy metals: ≤20 ppm
- Loss on drying: ≤1.0 %
- Sulphated ash: ≤0.1 %
- CAS number: 738-70-5
- Pack sizes: 1 g, 5 g, 25 g
- EG nr.: 212-006-2
- Purity: min. 99 %
- Empirical formula: C₁₄H₁₈N₄O₃
- Molar mass: 290,32 g/mol
- Technical Information Sheet:
- Safety Data Sheet:
Compliance & Safety Information
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Hazard Statements (H-Phrases)
Precautionary Statements (P-Phrases)
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Questions about Trimethoprim, min. 99 %, for biochemistry, 1 g, glass
What is this article?
Trimethoprim, min. 99 %, for biochemistry, 1 g, glass is the article on this page. Luminix Health distributes Carl Roth for laboratory use. It sits in Organic building blocks & synthesis reagents, inside Organic chemicals & synthesis reagents, in Lab chemicals.
A building block is an organic molecule bought to become part of a larger one. The structure, the CAS number and the purity decide it. A 95 percent reagent and a 99.9 percent reagent of the same name leave different impurities in the product. The functional groups are the reason it was chosen.
An organic chemical is built on carbon. In this category it is a building block or a reagent for making another molecule: a starting material, a coupling agent, a polymer, a PEG. Purity is a specification of which impurities remain. The structure, the CAS number and the grade decide whether two bottles are the same substance. Structures and properties are on PubChem. Nomenclature is IUPAC. Classification follows ECHA and the CLP Regulation.
Which category should I open next?
The category is Organic chemicals & synthesis reagents. The sub-category is Organic building blocks & synthesis reagents. The catalogue is Lab chemicals.
Shelves beside this one are Polymers, PEGs & silicones and Click chemistry, bioconjugation & synthesis reagents.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.

