Abstract :
This study investigates the degradation of frying oils used in local food establishments through the analysis of key quality parameters. Oil samples, collected after frying common food items such as samosas, Manchurian, chicken, medu vada, jalebi, and momos for prolonged periods (8–9 hours), were examined. Palm and vegetable oils were analysed for acid value, saponification value, peroxide value, and iodine value using standard titrimetric techniques. Acid-base titration methods were applied for acid, peroxide, and saponification values, while iodometric titration was used for iodine value. The comparative assessment highlights the chemical changes occurring in reused oils, emphasizing the necessity of regular monitoring to ensure safety and suitability for continued use in food preparation.
Keywords :
Acid value, Iodine value, Peroxide Value, Saponification value, Titrimetric analysis, Used frying oil.References :
- Adel Imhemed Alajtal, Fatima Emhemed Sherami, Mohamed Atiga Elbagermi. Acid, Peroxide, Ester and Saponification Values for Some Vegetable Oils Before and After Frying. AASCIT Journal of Materials. Vol. 4, No. 2, 2018, pp. 43-47.
- Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, Korea *Corresponding author: Jin-Man Kim, Department of Food Science and Biotechnology of Animal Resources, Konkuk University, Seoul 05029, Korea.
- Chebet, J., Kinyanjui, T., & Cheplogoi, P. K. Impact of frying on iodine value of vegetable oils before and after deep frying in different types of food in Kenya
- Farrokhzadeh, H., Ghorbani, E., Hashemi, H., Mohebat, L., Hassanzadeh, A., Yahay, M., Samadanian, F., & Jaberi, H. (Year). Measurement of used oil rancidity indexes in the confectioneries and food shops. International Journal of Environmental Health Engineering, 2(1)
- Effect of frying process on fatty acid composition and iodine value of selected vegetable oils and their blends Alireza, S., Tan, C. P., Hamed, M. and Che Man, Y. B. Department of Food Technology, Faculty of Food Science and Technology, University Putra Malaysia, 43400 Serdang, Selangor, Malaysia, international food research journal 17, page (295-302)
- Iodine value: Definition, Principle, Procedure, Formula, and 2 Reliable Applications Pratiksha Chaudhary. Retrieved November 8, 2022 from https://chemistnotes.com/biochemistry/iodine- value-definition-principle-procedure-formula-and-2-reliable-applications
- Foods acid value quality and fats, John Moore et University of Wisconsin, Madison University of Wisconsin, Madison CHEMPRIME published on 05/09/2023 page no. 134
- Low, K., & Ng, C. S. (2023). Analysis of oils: Determination of saponification value. Marine Fisheries Research Department, Southeast Asian Fisheries Development Center. Retrieved from http://hdl.handle.net/1834/41020.
