Fatty acids composition
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Safety measures
- When preparing the Sulfuric acid - do it in the chemical hood (with lowered glass) with safety glasses and thick gloves
- Pour the acid into the methanol in cooled (with ice) bucket
- The work should be conducted in chemical hood
- When dealing with hot equipment and sulfuric acid - wear thick gloves
Equipment
- The work should be conducted on the flask with the fat remains from the fat content
- Heating sleeves
- Condensation system (with ice!!!) and the long condenser
- 50 ml measuring flasks with plug
- Syringe with needle
- Filters (pink - 20 ul)
- Glass pipets
- Brown veils and cups
Materials
- Double distilled water (DDW)
- Methanol (LCMS grade)
- Sulfuric acid (3%) in methanol
- Petroleum ether
Protocol
- Add to the flask with the fat remains 30 ml of acidic methanol
- Heat the flask in condensation system for 1 hr
- Cool the flask and transfer the content to 50 ml measuring flask
- Clear the flask with 2 ml petroleum ether and transfer the liquid to the 50 ml flask
- Add 10 ml of DDW, plug and shake well
- Add water until the liquid reach the 50 ml mark
- Wait 10 minutes for phase separation
- Transfer the upper phase to brown veil
- Filter the sample using syringe and filter
- Plug the veil until running the GCMS
- Before the first run in the GCMS Calibration curve should be done and samples should be diluted sample dilution