UV/Vis/NIR spectrophotometer is a Perkin-Elmer Lambda 19 model (Bodenseewerk Perkin-Elmer GmbH, Germany). It is a general purpose instrument for absorption spectroscopy in the ultraviolet (UV), visible (Vis), and near infrared (NIR) spectral regions with wavelength range from 200nm to 3200nm and it is operated with the Lambda 19 operating software.