title: A unique quantitative method of acid value of edible oils and studying the impact of heating on edible oils by UV-Vis spectrometry.
abstract: UV-Vis spectroscopy coupled with chemometrics was used effectively to study the impact of heating on edible oils (corn oil, sunflower oil, rapeseed oil, peanut oil, soybean oil and sesame oil) and determine their acid value. Analysis of their first derivative spectra showed that the peak at 370 nm was a common indicator of the heated oils. Partial least squares regression (PLS) and principle component regression (PCR) were applied to building individual quantitative models of acid value for each kind of oil, respectively. The PLS models had a better performance than PCR models, with determination coefficients (R(2)) of 0.9904-0.9977 and root mean square errors (RMSE) of 0.0230-0.0794 for the prediction sets of each kind of oil, respectively. An integrate quantitative model built by support vector regression for all the six kinds of oils was also developed and gave a satisfactory prediction with a R(2) of 0.9932 and a RMSE of 0.0656.
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Wenle
authors.initials: W
authors.lastname: Zhang
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Na
authors.initials: N
authors.lastname: Li
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Yuyan
authors.initials: Y
authors.lastname: Feng
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Shujun
authors.initials: S
authors.lastname: Su
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: College of Chemical Engineering, Sichuan University, Chengdu 610065, PR China. Electronic address: lianngbing@sina.com.
authors.forename: Bing
authors.initials: B
authors.lastname: Liang
mesh_terms: D003314:Corn Oil / Q000032:analysis; D005229:Fatty Acids, Monounsaturated; D005230:Fatty Acids, Nonesterified / Q000032:analysis*; D006361:Heating; D016018:Least-Squares Analysis; D000074241:Peanut Oil; D010938:Plant Oils / Q000032:analysis*; D000074262:Rapeseed Oil; D012715:Sesame Oil / Q000032:analysis; D013024:Soybean Oil / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet; D000074242:Sunflower Oil
chemical_list: D005229:Fatty Acids, Monounsaturated; D005230:Fatty Acids, Nonesterified; D000074241:Peanut Oil; D010938:Plant Oils; D000074262:Rapeseed Oil; D000074242:Sunflower Oil; D013024:Soybean Oil; D003314:Corn Oil; D012715:Sesame Oil
keywords: Acid value; Chemometrics; Edible oil; Heating; UV–Vis spectroscopy