The intact wax esters in jojoba oil were analyzed by microbore LC-MS. Neither atmospheric pressure chemical nor electrospray ionization (APCI and ESI) provided ions. Excellent ionization was obtained by adding post column Ag+ ions. With this technique, called coordination ion spray MS (CIS-MS), the molecular ion could be unequivocally elucidated and, by applying a collision induced dissociation (CID) voltage of 290 V, the acidic and alcoholic part of the different wax esters could be identified. Ion formation and fragmentation are discussed. Unsaturation in the alcohol or acid chain is not a prerequisite for obtaining [M+Ag]+ ions but fragmentation only occurs when the chains are unsaturated.
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Medvedovici et al. (2002) studied this question.
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