How to find the right Chemical Alcohols AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Chemical Alcohols
- Proof and water content
- 200-proof (absolute) ethanol is for anhydrous or molecular work. 190 proof is about 95%. For disinfection, about 70% alcohol outperforms 99%. Water content changes both chemistry and disinfecting performance.
- Denatured vs undenatured
- Use undenatured ethanol for molecular biology, HPLC and anything consumed. Check which denaturants a denatured product contains. Denaturants such as methanol, isopropanol or ketones interfere with assays and are toxic.
- Grade for application
- Choose HPLC/LC-MS grade methanol or IPA for chromatography, molecular biology grade for nucleic acid work and USP for pharmaceutical use. Residue, UV absorbance and nucleases differ by grade.
- Flammable shipping and storage
- Store in a flammables cabinet and buy quantities your storage allows. Alcohols are Class IB flammable liquids.
Brands that matter
- Decon Labs (Koptec): Known for 200-proof and USP ethanol.
- Pharmco (Greenfield Global): Ethanol and solvent alcohols across grades.
- Fisher Chemical: HPLC and ACS alcohols.
- Sigma-Aldrich (MilliporeSigma): Molecular biology and anhydrous grades.
- Honeywell Burdick & Jackson: High-purity chromatography alcohols.
What to avoid
- Rubbing alcohol from a pharmacy used for analytical work
- Denatured ethanol for PCR or nucleic acid precipitation
- Assuming 99% IPA is a better disinfectant than 70%
Questions
Which ethanol for DNA precipitation?
Use undenatured molecular biology grade, typically 200 proof diluted as your protocol specifies.