Characterization of the antibacterial galactomannan/Zn(OH)2–ZnO composite material prepared in situ from a green process using mesquite seeds as a biopolymer source

In this work, the preparation of an antibacterial galactomannan/ Zn(OH) 2 –ZnO composite material by a green process is proposed and demonstrated. The galactomannan polysaccharide was extracted from the arid-native mesquite ( Prosopis spp.) seeds through a hydrothermal technique, and it was used as...

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Bibliographic Details
Published in:Bulletin of materials science 2019-06, Vol.42 (3), p.116
Main Authors: Bouttier-Figueroa, D C, García-Valenzuela, J A, Cabrera-German, D, Cota-Leal, M, Quevedo-López, M A, Rosas-Durazo, A, Sotelo-Lerma, M
Format: Article
Language:English
Subjects:
Antimicrobial agents
Aqueous solutions
Arid zones
Biopolymers
Chemical precipitation
Chemistry and Materials Science
Coliforms
Composite materials
E coli
Engineering
Ethanol
Infrared analysis
Life sciences
Materials Science
Mesquite
Metal hydroxides
Particulate composites
Polymers
Polysaccharides
Seeds
Thermal analysis
Thin films
Zinc oxide
Zinc oxides
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Summary:In this work, the preparation of an antibacterial galactomannan/ Zn(OH) 2 –ZnO composite material by a green process is proposed and demonstrated. The galactomannan polysaccharide was extracted from the arid-native mesquite ( Prosopis spp.) seeds through a hydrothermal technique, and it was used as an organic polymeric matrix for the in situ chemical precipitation of the Zn(OH) 2 –ZnO inorganic particles from simple reactions between Zn 2 + and NaOH. The preparation was performed under standard conditions in aqueous solutions. The composite material, which was obtained by centrifugation of the previous preparation, was characterized by X-ray diffraction, transmission and scanning electron microscopy, infrared spectroscopy and thermal analysis. By means of these techniques, it was deduced that the composite material is highly crystalline (about 94%), composed of about 92% inorganic and 8% organic portion, and has a predominant size of 760 nm and a mean size of 800 nm. The antibacterial activity of the composite material was also studied, which resulted better against Escherichia coli (Gram-negative bacterium) than against Staphylococcus aureus (Gram-positive bacterium), which was calculated in a difference of about 30%. This work presents the high potential of galactomannans to form functional composite materials with inorganic particles.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-019-1810-8