You want to extract total fat from peanuts. What is the most preferred method?

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Hopefully the biscuits example helped you to learn a lot about methods for total fat extraction. Now you are almost finished with the part about ‘total fat’. Complete the table below for an overview of the different methods. When you are finished, there will be

some final questions on other products than biscuits.

You are not right. Alkaline hydrolysis is specially developed for dairy products.

Not right. Folch extraction is not the preferred method. Although Folch extraction could be used, it is more labor-intensive than a simple Soxhlet extraction. So Soxhlet is the preferred method.

Not right. Acid hydrolysis is not the preferred method. Although acid hydrolysis could be used, it is not necessary to treat the sample with acid.

Right! The Soxhlet method is the most optimal method. However, the Folch method is also a valid method, but more labour intensive than the Soxhlet method.

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Folch extraction

Soxhlet extraction

Acid hydrolysis (Schmid/Weibull)

Alkaline hydrolysis (Röse-Gottlieb)