J. of Supercritical Fluids 152 (2019) 104574 Contents lists available at ScienceDirect The Journal of Supercritical Fluids journal homepage: www.elsevier.com/locate/supflu Valorisation of mango peel: Proximate composition, supercritical fluid extraction of carotenoids, and application as an antioxidant additive for an edible oil Andrea del Pilar Sánchez-Camargo a,b,∗ , Luis-Felipe Gutiérrez b , Sandra Milena Vargas a , Hugo A. Martinez-Correa c , Fabián Parada-Alfonso a , Carlos-Eduardo Narváez-Cuenca a a Food Chemistry Research Group, High Pressure Laboratory, Departamento de Química, Facultad de Ciencias Universidad Nacional de Colombia, Carrera 30 No. 45-03, 111321, Bogotá D.C., Colombia b Instituto de Ciencia y Tecnología de Alimentos, Universidad Nacional de Colombia Sede Bogotá, Carrera 30 # 45-03, Edificio 500A, 111321, Bogotá D.C., Colombia c Department of Engineering, Universidad Nacional de Colombia, Carrera 32 No. 12-00, Palmira, Colombia h i g h l i g h t s • Chemical composition of Colombian mango peel var. Sugar was explored. • The effects of freeze-drying and air-drying on the total carotenoid content were assessed. • Ethanol concentration showed the greatest significant effect in ScCO 2 optimization. • The optimal conditions to maxi- mize the carotenoid extraction yield was 25.0 MPa, 60 ◦ C and 15% w/w ethanol. • ScCO 2 optimum extract provides better protection to sunflower oil than all-trans--carotene. g r a p h i c a l a b s t r a c t a r t i c l e i n f o Article history: Received 24 May 2019 Received in revised form 11 July 2019 Accepted 14 July 2019 Available online 18 July 2019 Keywords: All-trans-carotene Box-Behnken optimization Lipid oxidation Mango peel RP-UHPLC Supercritical fluid extraction a b s t r a c t Mango peel (MP) is an important by-product of the industrial mango processing, rich in phytochemical compounds. This study optimized the operating parameters of the supercritical CO 2 extraction (ScCO 2 ) of carotenoids from MP by means of a Box-Behnken design. The MP was characterized in terms of its proximate composition, and the effects of freeze-drying and air-drying on its total carotenoid content were investigated. The carotenoids profile of the optimal ScCO 2 extract was characterized by RP-UHPLC- DAD. This extract was evaluated as natural antioxidant for sunflower oil, using the Rancimat ® method. MP displayed high contents of crude protein and phenolic compounds. Although freeze-drying prevented the degradation of all-trans--carotene, air-drying was selected for the valorisation strategy. The higher yields of carotenoids were found at 25.0 MPa, 60 ◦ C, and 15% w/w ethanol. Under these conditions the MP-extracts protected the sunflower oil against lipid oxidation, which could be regarded as an interesting alternative for MP valorisation. © 2019 Elsevier B.V. All rights reserved. ∗ Corresponding autor at: Food Science Research Group, Departamento de Química, Facultad de Ciencias Universidad Nacional de Colombia, Carrera 30 #45-03, Bogotá D.C., 111321, Colombia. E-mail address: adsanchezc@unal.edu.co (A.d.P. Sánchez-Camargo). https://doi.org/10.1016/j.supflu.2019.104574 0896-8446/© 2019 Elsevier B.V. All rights reserved.