Collected spectra of all matrix, excipients, and solutions.

Collected mass spectra of (A) CHCA matrix, (B) sDHB matrix, (C) 0.123% BZK solution, (D) citric acid, (E) 1.0% caprylyl glycol solution, (F) 0.1% vitamin E solution, (G) BZK + citric acid treatment solution, (H) BZK + caprylyl glycol, (I) BZK + vitamin E, (J) Solution 1, and (K) Solution 2. All were collected in reflectron positive mode with 5,000 laser pulses. Mass range was set to m/z 100–600. All solutions were spotted with 40 mg/mL CHCA in acetone as the matrix. Labeled peaks of m/z 172, 212, 335, and 379 were all found to be CHCA matrix peaks. (TIF)