Synthesis and Characterization of Calcium Hydroxide Obtained From Agave Bagasse and Investigation of Its Antibacterial Activity

Guerrero, Leonardo Chávez; Garza-Cervantes, Javier Alberto; Caballero‐Hernández, Diana; González-López, J. R.; Sepúlveda-Guzmán, S.; Cantú-Cárdenas, María Elena

doi:10.20937/rica.2017.33.02.15

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…The XRD patterns of the raw eggshells and obtained CaO (hydrated) samples are given in Figure S2. The XRD patterns of the raw eggshells and hydrated CaO were similar to the earlier reported patterns indicated the decomposition of CaCO 3 into CaO at this temperature (Chávez Guerrero et al, ; Habte et al, ). The SEM image of eggshells‐derived HAp powders after 60 and 75 min of sonication is shown in Figure .…”

Section: Resultssupporting

confidence: 85%

“…It was interesting to note that the formation of dicalcium phosphate hydrate (DCPH) has occurred after 5 min of sonication, and the intensity of this peak suppressed at 60 min of sonication. The XRD patterns of the raw eggshells and obtained CaO (hydrated) samples are given in FigureS2.The XRD patterns of the raw eggshells and hydrated CaO were similar to the earlier reported patterns indicated the decomposition of CaCO 3 into CaO at this temperature(Chávez Guerrero et al, 2017;Habte et al, 2019). The SEM image of eggshells-derived HAp powders after 60 and 75 min of sonication is shown in Figure4.…”

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confidence: 80%

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Osteogenic potential of human mesenchymal stem cells on eggshells‐derived hydroxyapatite nanoparticles for tissue engineering

2019

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Nanocrystalline hydroxyapatite (HAp) was synthesized from biowaste eggshells through sonication followed by the heat treatment. Calcium oxide as a precursor moiety for the synthesis of HAp was obtained through the heat treatment of eggshells at 900 C for 3 hr. The prepared HAp was characterized by Fouriertransform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM). The appearance of the FTIR absorption peaks in between at 516-1031 and 3,636 cm −1 shows phosphate and hydroxyl groups in prepared HAp, respectively. The XRD-patterns indicate the formation of HAp started within 5 min of sonication. The SEM morphologies suggested that the synthesized HAp was highly crystalline and compact. We tested the elemental analysis of the synthesized HAp through X-ray fluorescence spectroscopy and inductively coupled plasma mass spectroscopy. The higher Ca/P ratio has observed in heat-treated HAp. These results show that heat treatment facilitates the formation of highly crystalline and compact HAp. Cytotoxicity and osteogenic potential of human mesenchymal stem cells (hMSCs) were also evaluated in the presence of HAp. No significant cytotoxicity was noted in the presence of HAp, suggested their biocompatibility. Enhanced osteogenesis of hMSCs occurred with HAp powder, confirming the feasibility in the treatment of osteogenesis. Thus, synthesized HAp has the potential to use a biomaterial in tissue engineering applications for bone tissues. K E Y W O R D S eggshells, human mesenchymal stem cells, nano-hydroxyapatite, tissue engineering

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Section: Resultssupporting

confidence: 85%

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confidence: 80%

Osteogenic potential of human mesenchymal stem cells on eggshells‐derived hydroxyapatite nanoparticles for tissue engineering

2019

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“…Then, 8 mL of H 2 O was added to each 2 g of CaO, until it became homogeneous. Later, the paste was dried at 100 • C for 5 h, and, finally, the Ca(OH) 2 was obtained [24].…”

Section: Calcium Hydroxide Synthesis-ca(oh)mentioning

confidence: 99%

Chitosan-Based Biomaterial, Calcium Hydroxide and Chlorhexidine for Potential Use as Intracanal Medication

Nunes¹,

Rosendo

Filho

et al. 2021

Materials

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The objective of this study was to develop a chitosan-based biomaterial with calcium hydroxide and 2% chlorhexidine for intracanal treatment application and, consequently, to diminish the number of microorganisms in the root canal system. The chitosan solution was prepared by dissolving it in 2% and 4% acetic acid (v/v) for 1 h at room temperature (25 °C) with magnetic agitation (430 rpm). Calcium hydroxide was obtained in two stages: the first was the synthesis of the calcium oxide—CaO, and the second was that of the calcium hydroxide—Ca(OH)2. The samples were developed using different concentrations of chitosan, calcium hydroxide, and chlorhexidine 2%. They were codified as Ca(OH)2 + Q2% (M1), Ca(OH)2 + Q4% (M2), Ca(OH)2 + Q2% + CLX (M3), Ca(OH)2 + Q4% + CLX (M4), Ca(OH)2 + Q2% + PEG (M5), and Ca(OH)2 + Q4% + PEG (M6). They were characterized through Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and rheological measurement, and the antimicrobial activity was evaluated in vitro. Characteristic absorption bands of the source materials used in this research were observed in the FTIR spectra. The X-ray diffraction technique indicated that the material has a semi-crystalline structure and that the presence of calcium hydroxide made the biomaterial more crystalline. The viscosity measurement showed a pseudoplastic behavior of the studied samples. The microbiologic analysis was positive for all samples tested, with bigger inhibition zones for the samples M3 and M4. As a result, we conclude that the formulation developed based on chitosan is promising and has potential to be an intracanal medication.

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“…19 The presence of CaO and MgO in lime is due to this material being derived from calcium and magnesium carbonates, which assume the form of oxides after calcination, a process that occurs when lime is manufactured industrially. Finally, lime also showed reflections related to Ca(OH) 2 , 20 which may appear due to the reaction of the calcium oxide with the humidity of the air. Comparatively, the pattern obtained for calcined eggshell is also shown in Fig.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Ethylene production by partial oxidation of biogas using lime as catalyst

May,

Perez‐Lopez

2023

J of Chemical Tech & Biotech

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The oxidative coupling of methane (OCM) is an interesting route for direct conversion of methane into ethylene and ethane. Nevertheless, COx is a secondary product of this route, which decreases the selectivity of hydrocarbons. In this work it is proposed to overcome this drawback by using biogas as source of methane. In addition to being a renewable source of methane, the presence of CO2 in biogas may shift the balance of the methane combustion. For this purpose, it was evaluated how process conditions such as O2 and CO2 flow rates and temperature affect biogas‐based OCM, in the temperature range of 650 – 800 °C, using lime as catalyst. The increase in CO2 flow from 0 to 15 mL.min‐1 increased the ethylene selectivity from 25.9% to 44.5% at 800 °C. As consequence, CO2 formation dropped from 53.9% to 18.3%. Methane conversion was not affected significantly by CO2 flow rate, remaining in the range of 22 – 25%. O2 flow was essential to activate the OCM reaction and the presence of higher concentrations of O2 favored the selectivity of ethylene, but also increased the CO2 produced through methane combustion. In the OCM experiments with variable flow of CO2, the highest C2 yield of 18% was obtained for the highest flow of co‐fed CO2, whereas the experiments with biogas and variable O2 flow showed the highest yield of ethylene for the highest flow of air co‐fed. Thus, biogas‐based OCM was shown to be a promising route to improve C2 selectivity, since the CO2 present in the biogas minimizes the formation of CO2 in the reaction. The use of lime as a low‐cost catalyst proved to be viable for the OCM reaction, presenting results compatible with those obtained for catalysts with more complex composition.This article is protected by copyright. All rights reserved.

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Synthesis and Characterization of Calcium Hydroxide Obtained From Agave Bagasse and Investigation of Its Antibacterial Activity

Cited by 16 publications

References 16 publications

Osteogenic potential of human mesenchymal stem cells on eggshells‐derived hydroxyapatite nanoparticles for tissue engineering

Osteogenic potential of human mesenchymal stem cells on eggshells‐derived hydroxyapatite nanoparticles for tissue engineering

Chitosan-Based Biomaterial, Calcium Hydroxide and Chlorhexidine for Potential Use as Intracanal Medication

Ethylene production by partial oxidation of biogas using lime as catalyst

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