Sinapic acid is a small naturally occurring hydroxycinnamic acid. Sinapic Acid is a member of the phenylpropanoid family. It is a useful matrix for a wide variety of peptides and proteins. It serves well as a matrix for MALDI due to its ability to absorb laser radiation and to also donate protons (H+) to the analyte of interest. Sinapinic acid can be found in vinegar.
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