Automated and Simultaneous Determination of Free Fatty Acids and Peroxide Values in Edible Oils by FTIR Spectroscopy Using Spectral Reconstitution

作者：Yu Xiuzhu; Du Shuangkui; van de Voort Frederick R; Yue Tianli^*; Li Zhixi

来源：Analytical Sciences, 2009, 25(5): 627-632.

DOI：10.2116/analsci.25.627

This paper described an FTIR spectrometer coupled to an auto-sampler and some attendant methodologies for a direct free fatty acid (FFA) method and triphenylphosphine (TPP)-based method for determination of FFA and peroxide value (PV) of edible oils by FTIR spectroscopy using spectral reconstitution. The viscosity of oil samples is reduced by mixing them with a diluent: such lowered viscosity allows them to be readily loaded into a flow-through transmission cell. The spectra of the neat oil samples are then reconstituted front those of the diluted samples by using the absorption of a spectral marker present in the diluent to determine the dilution ratio. For the direct FFA analysis, quantification is achieved using the (COO(-)) band at 1712 cm(-1), while PV is determined using triphenylphosphine oxide (TPPO) absorption bands at 542 cm(-1). Calibration procedures and data are presented. Validation and performance data obtained with this automated system demonstrate that it is capable of analyzing similar to 90 samples/h, a rate commensurate with the throughput required by commercial contract or high-volume process control laboratories.

• 出版日期2009-5
• 单位西北农林科技大学; McGill