TY - JOUR
T1 - 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
AU - Sotelo Lerma, Mérida
N1 - Publisher Copyright:
© Indian Academy of Sciences.
PY - 2019/6
Y1 - 2019/6
N2 - 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 Zn2+ 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.
AB - 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 Zn2+ 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.
KW - Antibacterial activity
KW - Composite materials
KW - Galactomannan
KW - Green synthesis
KW - Zinc hydroxide
UR - http://dx.doi.org/10.1007/s12034-019-1810-8
U2 - 10.1007/s12034-019-1810-8
DO - 10.1007/s12034-019-1810-8
M3 - Artículo
SN - 0250-4707
VL - 42
JO - Bulletin of Materials Science
JF - Bulletin of Materials Science
IS - 3
M1 - 116
ER -