The objective of this research was to asses relationship between temperature and storage time of capsaicin degradation of red chilli paste and to measure activation energy and shelf life using the Arrhenius model. The treatmens were storage temperature (20°C, 30°C, 40°C) and storage times (0, 2, 4, 6, 8, 10 weeks). Parameters analyzed were capsaicin content using HPLC method, pH, and particle size. The data was analyzed using linier regression and Arrhenius equation The results showed that temperature condition and storage time affected capsaicin degradation of red chilli paste, unlike pH and particle size. The longer storage time the lower capsaicin content. The capsaicin content of red chilli paste stored at 30°C and 40°C in week-4 was 746,36 μg/g and 714,19 μg/g respectively, and it declined to 149,31 μg/g and 136,77 μg/g after being stored for ten weeks. Research concluded that red chilli paste stored for 10 weeks at 20°C caused the lowest capsaicin degradation from 916.8029 μg/g to 683.8097 μg/g. Degradation rate of capsaicin followed the first order reaction. Arrhenius equation for capsaicin was Y= -9356.3x + 27.836, (R=0.76), and activation energy was 18.581 kcal/mol. Shelf life determination of capsaicin followed kinetic reaction equation of the fi rst order i.e t = ln(Ao-At)/k. The self life of red chilli paste stored at 20°C, 30°C and 40°C were 10.62 weeks, 8.62 weeks and 8.45 weeks respectively.
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