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Trees of  Moringa oleifera  are the most widely exploited species of  Moringa  and proteins extracted from its seeds have been identified as the most efficient natural coagulant for water purification. Largely for climatic reasons, other  Moringa  species are more accessible in some regions and this paper presents a comparative study of the adsorption to different materials of the proteins extracted from seeds of  Moringa peregrina  and  Moringa oleifera  to explore their use as flocculating agents in regions where each is more readily accessible. Results showed that  Moringa peregrina  seed proteins had higher adsorption to alumina compared to silica, in contrast to opposite behavior for  Moringa oleifera . Both species provide cationic proteins that can act as effective coagulants for the various impurities with different surface potential. Despite the considerable similarity of the amino acid composition, the seed proteins have significantly different adsorption and this presents the opportunity to improve processes by choosing the optimal species or combination of species depending on the type of impurity or possible development of separation processes.

Comparative study of flocculation and adsorption behaviour of water treatment proteins from Moringa peregrina and Moringa oleifera seeds