The FTIR spectra of the lipopeptides
were recorded using a Thermo-Scientific Nicolet iS5 instrument with
a deuterated triglycine sulfate (DTGS) detector, with a Specac Pearl
liquid cell containing CaF2 plates, where the sample was
fixed. A total of 128 scans for each sample were recorded over the
range of 900–4000 cm–1.
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