Fabrication and characterization of an eco-friendly antibacterial nanocomposite of galactomannan/ZnO by in situ chemical co-precipitation method

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

“…), which belongs to the Leguminosae family and which is native of the arid and semi-arid zones, can be used as a source of galactomannan for the habitants of these regions. In this context, we reported an optimized hydrothermal methodology for the extraction of galactomannan from mesquite seeds [26], which was recently proven to be useful in the preparation of antibacterial galactomannan/ZnO nanocomposites [27]. Thus, in the exploration of new options for the sustainable utilization of natural resources from the arid zones, the present study encourages the use of mesquite seeds as a green source of galactomannan.…”

“…Particularly, in the present research we report a green-prepared galactomannan/Zn(OH) 2 -ZnO composite, which was obtained from an alternative way as compared to the previously reported galactomannan/ZnO. Since we have previously observed that as higher the content of galactomannan in the composite the lower the antibacterial activity [27], in this alternative way we have reduced the content of the organic portion in the resulting composite; interestingly, the resultant material was chemically different: the inorganic portion is mainly composed of Zn(OH) 2 . Thus, we present below the structural and thermal characteristics, as well as the morphology, of the obtained galactomannan/Zn(OH) 2 -ZnO composite material.…”

“…We have identified two ways to treat the previous preparation in order to obtain a composite between galactomannan and the zinc compound: (a) precipitation with ethanol in static mode (without centrifugation) and (b) mechanical precipitation by centrifugation without ethanol. According to the previous report [27], the inorganic portion of the composite precipitated with ethanol is ZnO, and the galactomannan is present as a considerable constituent of the composite. On the other hand, as presented in this paper, the inorganic portion of the composite material precipitated by centrifugation is mainly Zn(OH) 2 , and it is present as the main component of the whole composite.…”

Preparation and characterization of antibacterial gels of galactomannan/ZnO nanocomposite in carbopol-based matrix using mesquite seeds as the biopolymer source

“…The synthesis of the GM/ZnO nanocomposite was carried out as previously published. 14 For this, the first step is the extraction and purification of galactomannan according to our previously reported process. [14][15][16] Mesquite (Prosopis spp.)…”

“…14 For this, the first step is the extraction and purification of galactomannan according to our previously reported process. [14][15][16] Mesquite (Prosopis spp.) seeds were used for the extraction of galactomannans; they were purchased from the National Forestry Commission of Mexico (Comisión Nacional Forestal, CONAFOR) from Hermosillo, Sonora.…”