Objective: To analyze the difference of deterioration products in bio-waste oil and vegetable oils.
Methods: The changes of species and abundance of deterioration products were analyzed through observing the differences in Raman spectra during the process of deterioration and refining.
Results: The deterioration contents produced during heating, cooking, frying and wasting, instead of storage, were significantly more abundant than normal contents. Through the refining process, the deterioration products abundance was reduced in vegetable oils while increased in bio-waste oils.
Conclusion: Due to the distinct deteriorating processes, the species and abundance of deterioration products are remarkably different in bio-waste oil and vegetable oils. The deterioration products in vegetable oils would be mostly removed, but those in bio-waste oils are concentrated instead of eliminated during the refining procedure.