TY - JOUR
T1 - Near infrared emission photometer for measuring the oxidative stability of edible oils
AU - Vieira, Francisco Senna
AU - Pasquini, Celio
N1 - Funding Information:
This is a contribution of the National Institute for Advanced Science and Technology (INCTAA) – Proc. FAPESP 2008/57808-1 and CNPq 573894/2008-6 . The authors are grateful to Dr. J. J. R. Rohwedder for helpful discussion during the construction of the NIRES photometer, to Dr. C.H. Collins for manuscript revision, and to Mr. Mário Shissun Toma, member of the staff of the micromechanical workshop of the Chemistry Institute of UNICAMP, for manufacturing several devices of the photometer. F. S. V. is grateful to CNPq for the MSc fellowship.
PY - 2013/9/24
Y1 - 2013/9/24
N2 - Near infrared emission spectroscopy (NIRES) allows the determination of the induction time (IT) of edible oils in accelerated oxidation experiments by monitoring the emissivity of a band at 2900nm, which corresponds to the formation of hydroperoxides. In this work, a new near infrared emission photometer dedicated to the determination of oxidative stability is described. The photometer presents several advantages compared to the previously reported NIRES instrument, such as lower cost and extreme simplicity of design and maintenance. The results obtained in the evaluation of the proposed instrument were compared with the official Rancimat method and instrument. The significant advantages include: faster analysis, lower sample consumption and operational simplicity. It is demonstrated that the procedure for determination of oxidative stability of oils can be significantly simplified and performed by measuring the sample emission at only one spectral region centered at 2900nm. Also, the proposed instrument and method present precision equivalent to the Rancimat method (coefficient of variation=5.0%). A significant correlation between the methods has been found (R2=0.81).
AB - Near infrared emission spectroscopy (NIRES) allows the determination of the induction time (IT) of edible oils in accelerated oxidation experiments by monitoring the emissivity of a band at 2900nm, which corresponds to the formation of hydroperoxides. In this work, a new near infrared emission photometer dedicated to the determination of oxidative stability is described. The photometer presents several advantages compared to the previously reported NIRES instrument, such as lower cost and extreme simplicity of design and maintenance. The results obtained in the evaluation of the proposed instrument were compared with the official Rancimat method and instrument. The significant advantages include: faster analysis, lower sample consumption and operational simplicity. It is demonstrated that the procedure for determination of oxidative stability of oils can be significantly simplified and performed by measuring the sample emission at only one spectral region centered at 2900nm. Also, the proposed instrument and method present precision equivalent to the Rancimat method (coefficient of variation=5.0%). A significant correlation between the methods has been found (R2=0.81).
KW - Autoxidation
KW - Edible oil
KW - Instrumentation
KW - Near infrared emission photometer
KW - Oxidative stability
UR - http://www.scopus.com/inward/record.url?scp=84883561240&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2013.08.028
DO - 10.1016/j.aca.2013.08.028
M3 - Article
C2 - 24016589
AN - SCOPUS:84883561240
VL - 796
SP - 101
EP - 107
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
SN - 0003-2670
ER -