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Comparison of protected to unprotected samples coated with the solute prior to measurement by soaking or drop-coating: (a) ectoine, (b) hydroxyectoine, (c) trehalose (top: scores, bottom: loadings of PC1). All samples were stored for 24 h at 4 °C. The dotted lines in the score plots show the 95% confidence limits. Positive polarity ToF-SIMS spectra were analyzed.
