Complexation of anthocyanins, betalains and carotenoids with biopolymers: An approach to complexation techniques and evaluation of binding parameters

•Natural pigments can be complexed with biopolymers (BP) by using several techniques.•Complexation can improve the stability and bioaccessibility of natural pigments (NP).•Proteins and polysaccharides are the most common BP used as wall materials to NP.•Different techniques can be used to obtain the binding properties involved in NP-BP complex formation.•Thermodynamic parameters of complex formation can provide information about the stability of NP-BP complexes.