2003 Volume 52 Issue 8 Pages 374-377
An increase behavior of radicals in black pepper induced by the γ-ray irradiation was analyzed using electron spin resonance (ESR) spectroscopy. A sharp signal at g = 2.0, observed in the ESR spectrum of pepper due to organic free radicals produced by γ-ray irradiation, in-creased exponentially in the early stage of heating procedure and then leveled off at a certain value. The increase behavior was analyzed following to a first order differential equation, and obtained a general solution under the restrictions of initial and boundary conditions. Based on the general solution, we carried out the functional prediction using the nonlinear least squares method, and determined a rigorous solution for the time constant of the radical increase.
