Interactions of CdSe Nanocrystals with Cationic Proteins Extracted from Moringa oleifera Seeds

Author:

Daniel Likius Shipwiisho12ORCID,Kapofi Salatiel1,Kandawa-Schulz Martha1,Kwaambwa Habauka Majority3ORCID

Affiliation:

1. Department of Physics, Chemistry and Material Science, University of Namibia, Private Bag 13301, Windhoek 10026, Namibia

2. Multidisciplinary Research Service, Centre for Research Services, University of Namibia, Private Bag 13301, Windhoek 10026, Namibia

3. Faculty of Health, Natural Resources and Applied Sciences, Namibia University of Science and Technology, Private Bag 13388, 13 Jackson Kaujeua Street, Windhoek 10005, Namibia

Abstract

Even with significant developments in nanoscience, relatively little is known about the interactions of nanocrystal semiconducting materials with bio-macromolecules. To investigate the interfacial phenomena of cadmium selenide quantum dot (CdSe QD) nanocrystals with proteins extracted from Moringa oleifera seeds, different concentrations of cadmium selenide quantum dots–Moringa oleifera seed protein (CdSe–MSP) complexes were prepared. Respective CdSe QDs with hexagonal phase and crystalline size in the range of 4–7 nm were synthesized and labelled with the purified mesoporous MSP having a surface area of 8.4 m2/g. The interaction mechanism between CdSe QDs and MSP was studied using UV–Vis absorption, fluorescence emission and Fourier Transform Infrared spectroscopies. The UV–Vis absorption spectra showed absorption bands of CdSe–MSP complexes at 546.5 nm. The fluorescence intensity of CdSe QDs was found to decrease with increasing concentration of MSP. The thermodynamic potentials ∆Hθ (−321.3 × 103 Jmol−1); ∆Sθ (156.0 JK−1mol−1) and ∆Gθ (−46.6 × 103 Jmol−1) were also calculated. The stability of the complex found is strongly influenced by electrostatics interaction and surface-bound complexation equilibrium attraction. This information can help to elucidate the surface characteristics of MSP and its potential interactions with other molecules or nanoparticles.

Funder

National Commission of Science and Technology

Publisher

MDPI AG

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