*2.2.5 Analysis of the functions by FTIR*

One introduces 2% of the sample with 98% of KBr then crushes the mixture to prepare pellets. We put the pellet in the support of infrared apparatus we obtain the spectra below.

Fourier transform infrared (FTIR) analysis of the raw material, seeds, and shells of cistus in **Figure 2** shows free -OH bonds at 3658.07 cm�<sup>1</sup> and broadband of the bound

**Figure 2.** *FTIR spectrum of cistus shells and seeds.*

