Did the laboratory provide you with enough information to calculate the amount of n-3, n-6 and n-9 fatty acids?

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Not right. For some fatty acids the position of the double bound is indicated but not for all. For example C24:1 could be a n-9 fatty acid.

For some fatty acids the position of the double bound is not indicated. Sometimes you can predict the position of the double bound. For example C20:1 fatty acids in nature never have a double bound at the sixth position (n-6 fatty acid). However, for other fatty acids you can not predict the position of the double bound.

Right! Sometimes you can predict the position of the double bound. For example C20:1 fatty acids in nature never have a double bound at the sixth position (n-6 fatty acid). However, for other fatty acids you can not predict the position of the double bound. Therefore, you have to ask the laboratory for more information.

With respect to this margarine: none of the fatty acids for which the position of the double bounds is not indicated are n-6 of n-3 fatty acids.

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yes, it is indicated which fatty acids are n-6 and n-3 fatty acids as in C18:3 (n-6) etc.

no, for the C20 fatty acids the position of the double bound(s) are not indicated.

no, for the C14:1, C22:1 and C22:1 fatty acids the position of the double bound is not indicated.

Here you see the results (chromatogram) of the fatty acid analysis of the margarine. Study this chromatogram together with the data in the excel file.