Moulin, M, Mossou, E, Signor, L, Kieffer-Jaquinod, S, Kwaambwa, HM, Nermark, F, Gutfreund, P, Mitchell, EP, Haertlein, M, Forsyth, VT and Rennie, AR (2019) Towards a molecular understanding of the water purification properties of Moringa seed proteins. Journal of Colloid and Interface Science, 554. pp. 296-304. ISSN 0021-9797

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Seed extracts from Moringa oleifera are of wide interest for use in water purification where they can play an important role in flocculation; they also have potential as anti-microbial agents. Previous work has focused on the crude protein extract. Here we describe the detailed biophysical characterization of individual proteins from these seeds. The results provide new insights relating to the active compounds involved. One fraction, designated Mo-CBP3, has been characterized at a molecular level using a range of biochemical and biophysical techniques including liquid chromatography, X-ray diffraction, mass spectrometry, and neutron reflection. The interfacial behavior is of particular interest in considering water purification applications and interactions with both charged (e.g. silica) and uncharged (alumina) surfaces were studied. The reflection studies show that, in marked contrast to the crude extract, only a single layer of the purified Mo-CBP3 binds to a silica interface and that there is no binding to an alumina interface. These observations are consistent with the crystallographic structure of Mo-CBP3-4, which is one of the main isoforms of the Mo-CBP3 fraction. The results are put in context of previous studies of the properties of the crude extract. This work shows possible routes to development of separation processes that would be based on the specific properties of individual proteins.

Item Type: Article
Additional Information: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: Moringa oleifera seeds, Mass spectrometry, Neutron reflectometry, X-ray diffraction, Water treatment
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 25 Jun 2019 09:22
Last Modified: 21 Jun 2020 01:30

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