Towards improvement in prediction of iodine value in edible oil system based on chemometric analysis of portable vibrational spectroscopic data

Abstract

Iodine value (IV) is a significant parameter to illustrate the quality of edible oil. In this study, three portable spectroscopy devices were employed to determine IV in mixed edible oil system, a new Micro-Electro-Mechanical-System (MEMS) Fourier Transform Infrared Spectrometer (MEMS-FTIR), a MicroNIRTM1700 and an i-Raman Plus-785S. Quantitative model was built by Partial least squares (PLS) regression model and four variable selection methods were applied before PLS model, which are Monte Carlo uninformative variables elimination (MCUVE), competitive reweighted sampling (CARS), bootstrapping soft shrinkage approach (BOSS) and variable combination population analysis (VCPA). The coefficient of determination (R2), and the root mean square error prediction (RMSEP) were used as indicators for the predictability of the PLS models. In MicroNIRTM1700 dataset, MCUVE gave the lowest RMSEP (2.3440), in MEMS-FTIR dataset, CARS showed the best performance with RMSEP (2.2185), in i-Raman Plus-785S dataset, BOSS gave the lowest RMSEP (2.5058). They all had great improvements than full spectrum PLS model. Four variable selection methods take a smaller number of variables and perform significant superiority in prediction accuracy. It was demonstrated that three new portable instruments would be suitable for the on-site determination of edible oil quality in infrared and Raman field.

Oxidative Stability and Quality Characteristics of Duck, Chicken, Swine and Bovine Skin Fats Extracted by Pressurized Hot Water Extraction

“…The IV represents the degree of unsaturated fats and oils and also indicates the relative content of USFA (Naz et al, 2005). The IV determines the quality and grade of oil and is used as an authentication test in the oil industry (Yan et al, 2018). The IV of animal skin fat in the present study is shown in Table 1.…”

Host-Guest UiO-66 Based Supra-MOF Assembly for Custom Designed Opto-Electronic Device

“…The emissive nature of CQDUiO-66 within the device was used for analyzing the quality of edible oils [22] as the current practices for analyzing edible oils [23] involve the use of tedious, costlier processes [24] requiring skilled manpower [25] . The chemical background of edible oils is that they are composed of saturated and unsaturated fatty acids, which contribute to the health benefit of oil.…”