Polysaccharides as Green Fuels for the Synthesis of MgO: Characterization and Evaluation of Antimicrobial Activities

Balaba, Nayara; Jaerger, Silvia; Horsth, Dienifer F. L.; Primo, Julia de O.; Correa, Jamille S.; Bittencourt, Carla; Zanette, Cristina Maria; Anaissi, Fauze Jacó

doi:10.3390/molecules28010142

Cited by 8 publications

(16 citation statements)

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“…The bands at 1425 and 1085 cm −1 were attributed to the asymmetric and symmetric stretching of an unidentate carbonate on the surface, respectively [4,39]. The bands in the spectrum after the incorporation of Ni 2+ (Figure 3b) at 1582 and 1398 cm −1 are from the symmetrical and asymmetrical ν(COO − ) [40,41].…”

Section: Morphological Behavior By Scanning Electronic Microscopy (Sem)mentioning

confidence: 97%

“…The utilized MgO was synthesized by the same route as Balaba et al [4], using cassava starch. The experimental procedure began with the extraction of starch (500 g) in 2.5 L of deionized water under stirring for 3 h followed by sieving.…”

Section: Synthesis Of Mgo From Cassava Starchmentioning

confidence: 99%

“…The γ(OH) region of the MgO st sample (Figure 3a) exhibits a band at 1486 cm −1 , which corresponds to the O-H bending mode. This mode is characterized by the bending vibration of the -OH group of the physisorbed water molecules [4].…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

“…Recently, the compound MgO has attracted attention due to its properties, including diverse nanostructures, a high surface area, and nontoxicity [1]. As a result, various fields are exploring applications such as catalysis [2], superconductor [3], biological activities [4][5][6], treatment of wastewater [7], and pigments [1]. The usual route to obtain MgO is through Mg(OH) 2 calcination [8].…”

Section: Introductionmentioning

confidence: 99%

“…According to previous works, MgO and Mg(OH) 2 are interchangeable, depending on the procedure of hydration or dehydration [9]. The use of organic fuel for the synthesis of MgO has been shown to be advantageous due to its low cost, lowering of the calcination temperature, and eco-friendly behavior [4].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Green Brucite [NixMg1−x(OH)2] by Incorporation of Nickel Ions in the Periclase Phase (MgO) Applied as Pigments

Siqueira,

Schons,

Appelt

et al. 2024

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Magnesium oxide is typically white and can be colorized with transition metal insertion by doping. We present the preparation of a green-colored hydroxide by the exchange of Mg2+ on the crystalline lattice with Ni2+ in MgO, using three nickel salts. MgOst was prepared by the colloidal starch suspension method, using cassava starch. The oxides and hydroxides, before and after, were characterized by X-ray diffraction (XRD), and show that a phase change occurs: a transition from periclase (MgO) to brucite (Mg(OH)2) due to the incorporation of nickel ions from different salts (acetate, chloride, and nitrate), resulting in the solid solution [NixMg1−x(OH)2]. The FTIR spectrum corroborates the crystallographic structure identified through XRD patterns, confirming the formation of a crystal structure resembling brucite. The new samples present a green color, indicative of the incorporation of the Ni2+ ions. The antimicrobial activity of products resulting from the doping of magnesium oxide with nickel and the precursor MgOst was assessed through the minimum inhibitory concentration (MIC) test. The evaluation included three bacterial strains: Staphylococcus aureus (ATCC 25923), Escherichia coli (ATCC 25922), Salmonella gallinarum (ATCC 9184), and a yeast strain, Candida albicans (ATCC 10231). The obtained results were promising; the tested samples exhibited antimicrobial activity, with a MIC ranging from 0.312 to 0.625 μg.μL−1. The nickel compound, derived from the precursor chloride salt, demonstrated superior MIC activity. Notably, all tested samples displayed bactericidal activity against the S. aureus strain and exhibited a broad spectrum of inhibition, encompassing both Gram-positive and Gram-negative strains. Only the nickel compounds derived from precursors with acetate and nitrate anions demonstrated antimicrobial activity against C. albicans, exhibiting a fungistatic behavior. Based on the conducted studies, [NixMg1−x(OH)2] has emerged as a promising antimicrobial agent, suitable for applications requiring the delay or inhibition of bacterial growth.

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