Opuntia monacantha(Willd.) Haw. of the Grumari Sandbank, RJ, Brazil: Physical, chemical, biological and nutritional composition characterizations

•Chemical composition of the unconventional edible specie Opuntia monacantha.•The fruits are rich in fiber, selenium, copper, and manganese.•Chemical profile of pulp and peel were established by HPLC-DAD-MS/MS and GC-MS.•Phenolic compounds were identified in the extract as rutin and quercetin derivatives.•Antibacterial apolar extract constituted of fatty acids and phytosterols