Peroxide value (PV)
PV was determined following a previously reported method (Shantha & Decker, 1994). Absorbance was measured at 510 nm using a PerkinElmer Lambda 35 UV/Vis spectrophotometer (Perkin Elmer, Waltham, MA, USA). Average values of two measurements are reported. The PV is given by the following formula:
\begin{equation} \text{PV}=\frac{(A_{s}-A_{b})*m}{55.84*m_{o}*2}\nonumber \\ \end{equation}
As: the absorbance of the sample, Ab: the absorbance of the blank,m: the slope of the standard curve, mo: mass of the sample.