Problem 11.4

The following MALDI spectrum has been obtained from a water-soluble biopolymer in onions. It has been acquired in the positive-ion mode and 2,5-DHB was used as the matrix. The isotopic pattern is not resolved.

MALDI spectrum of a biopolymer

a) What kind of biopolymer do you expect? Use the mass difference between peaks to identify the compound class.

b) Identify what kind of ionic species are occurring here.

c) Now you can also try to identify the endgroups.

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