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Opuntia ficus-indica (L.) Mill. is a cactus widely cultivated in northeastern Brazil due to its enormous growth potential and multiple uses. This study aimed to perform physicochemical characterization and in vitro evaluation of the photoprotective potential in the region of ultraviolet B (UVB) radiation of the oil from O. ficus-indica (L.) Mill. seeds. For physicochemical characterization of the oil, the following techniques were used: thermal analysis (TA), infrared spectrometry (IR) and gas chromatography-mass spectrometry (GC-MS). The photoprotective potential was determined by UV spectrophotometry. It was observed that O. ficus-indica (L.) Mill. oil is rich in saturated and unsaturated fatty acids, primarily linoleic acid (~65%), which may be related to the protection against ultraviolet rays (UVB). However, the results of evaluation of in vitro sun protection factor (SPF) indicated that under the conditions studied the oil from the O. ficus indica (L.) Mill. seeds does not have photoprotection activity.       Key words: Opuntia ficus-indica (L.) Mill., phytochemistry, physicochemical characterization, fatty acids composition, photoprotection.

Physicochemical characterization and in vitro evaluation of the photoprotective activity of the oil from Opuntia ficus-indica (L.) Mill. seeds