The aim of this study is to find alternative sources of pectin from three plant wastes mixtures, namely mango (Mangifera indica) fody variety, yellow variety of passion fruit (Passiflora edulis) and creamy brown-striped variety of Bambara groundnut (Vigna subterranea). A Mixture Experiments with Process Variables (MPV) design was applied. It is a combination of Scheffé's centroid mixture design and a full factorial design of the process variables (pH and Liquid/Solid ratio: LSR). The pH level was set at 1.5 and 2. The LSR level was fixed at 12.5ml/g and 15ml/g. Citric acid was used as acidifying agent. Pectin was extracted in a two-step sequential extraction at 80°C for 60 minutes. The plant sources, the mixing and the joint action of the pH and the LSR had significant effects on the production of highyielded pectins. All the mixes showed more important yields than individual plant sources at the couple of pH 1.5/LSR 15ml/g. At this condition, an optimum yield of 47.7% can be achieved with the mix composed by 69.7% of mango peel and 30.3% of Bambara groundnut shell. The MPV design is an innovative method permitting the identification of the synergetic or antagonistic effect of mixing and the selection of the suitable extraction conditions favorable to high-yielded extraction. Farther characterization, optimization and classification of these pectins will be needed in order to assess their commercial aptitude.

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