spectrometer (Bruker Optics, GmbH, Ettlingen, Germany) equipped with an In GaAs detectors working in 780e2500 nm (TEInGaAs internal for reflectance and RT-In GaAs external for transmittance) and 20-W high intensity tungsten halogen bulb was used as light source. All spectra were processed with OPUS software (Bruker Optics GmbH, Germany). Scanning parameters were 32 scans in 15.32 s and 128 scan in 62 s for reflectance and transmission spectrums, respectively (Aday et al., 2011).