Figure 6.
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Product-ion spectra of negative ions of the [M – CH3]− of PC 32.4/22:6 at m/z 1006 showing two abundant ions at m/z 327 and m/z 471, corresponding to C22:6 and C32:4 carboxylate anions, and the product ions formed by neutral loss of either an FA or a ketene at m/z 678 ([M – CH3 – R2CH-COOH]−), m/z 696 ([M – CH3 – R2CH=C=O]−), and m/z 552 ([M – CH3 – R1CH=C=O]−).
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