“…The importance of feedstock type for the quality of biodiesel has motivated the development of analytical methods to certify the base oil employed in the production process. Within this scope, several investigations have been concerned with the use of near-infrared (NIR) or UV-vis spectroscopy [12][13][14]. Balabin and Safieva [12], Veras et al [13], and Veras et al [14] employed biodiesel samples produced from nine (sunflower, coconut, palm, rapeseed, cottonseed, castor, jatropha, linseed, used frying oil), four (cotton, sunflower, soybean, canola), and three (cotton, soybean, sunflower) types of vegetable oil, respectively.…”