Linde Type a Zeolite and Type Y Faujasite as a Solid-Phase for Lead, Cadmium, Nickel and Cobalt Preconcentration and Determination Using a Flow Injection System Coupled to Flame Atomic Absorption Spectrometry

Peña, Yaneira Petit de; Rondón, Wendy

doi:10.4236/ajac.2013.48049

Cited by 37 publications

(6 citation statements)

References 35 publications

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“…Figure 3 A shows the spectrum of zeolite nanoparticles. The bands at 624 cm −1 and 791 cm −1 correspond to the characteristic vibration of an allotropic phase of SiO 2 [ 28 , 29 ], the peak located at 1012 cm −1 is due to the Al-O bond vibration [ 28 , 29 ]. The prominent peak at 1635 cm −1 belongs to Si-O bonds.…”

Section: Resultsmentioning

confidence: 99%

Zeolite Nanoparticles Loaded with 2-Methoxystradiol as a Novel Drug Delivery System for the Prostate Cancer Therapy

Mena-Silva

Alfaro

León

et al. 2023

IJMS

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The estrogen metabolite 2-methoxyestradiol (2ME) is a promissory anticancer drug mainly because of its pro-apoptotic properties in cancer cells. However, the therapeutic use of 2ME has been hampered due to its low solubility and bioavailability. Thus, it is necessary to find new ways of administration for 2ME. Zeolites are inorganic aluminosilicates with a porous structure and are considered good adsorbents and sieves in the pharmaceutical field. Here, mordenite-type zeolite nanoparticles were loaded with 2ME to assess its efficiency as a delivery system for prostate cancer treatment. The 2ME-loaded zeolite nanoparticles showed an irregular morphology with a mean hydrodynamic diameter of 250.9 ± 11.4 nm, polydispersity index of 0.36 ± 0.04, and a net negative surface charge of −34 ± 1.73 meV. Spectroscopy with UV-vis and Attenuated Total Reflectance Infrared Fourier-Transform was used to elucidate the interaction between the 2ME molecules and the zeolite framework showing the formation of a 2ME-zeolite conjugate in the nanocomposite. The studies of adsorption and liberation determined that zeolite nanoparticles incorporated 40% of 2ME while the liberation of 2ME reached 90% at pH 7.4 after 7 days. The 2ME-loaded zeolite nanoparticles also decreased the viability and increased the mRNA of the 2ME-target gene F-spondin, encoded by SPON1, in the human prostate cancer cell line LNCaP. Finally, the 2ME-loaded nanoparticles also decreased the viability of primary cultures from mouse prostate cancer. These results show the development of 2ME-loaded zeolite nanoparticles with physicochemical and biological properties compatible with anticancer activity on the human prostate and highlight that zeolite nanoparticles can be a good carrier system for 2ME.

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Section: Resultsmentioning

confidence: 99%

Zeolite Nanoparticles Loaded with 2-Methoxystradiol as a Novel Drug Delivery System for the Prostate Cancer Therapy

Mena-Silva

Alfaro

León

et al. 2023

IJMS

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“…Peak of 563.56 cm -1 is crystallization bond, complex bond, symmetry stretching of Si-O-Si and bending of O-Si-O. The bonds at about 562 cm -1 corresponds to symmetric stretching vibration of 5-member ring in zeolite structure [10]. The sharp peaks at 3471.68, 3487.78, 3566.69 and 3479.45 cm -1 is for O-H vibration stretching and the sharp small peak at or nearby 1638.12, 1653.17, 1653.00 and 1652.80 cm -1 is to O-H vibration bending which refers to the presence of water molecules in the zeolite structure of all samples.…”

Section: Procedures Of Zeolites Synthesismentioning

confidence: 96%

Local Wastes for Synthesis of Different Types of Zeolites

Abdullah¹,

Shareef²

2015

International Conference on Chemical, Agricultural and Biological Sciences (CABS-2015) Sept. 4-5, 2015 Istanbul (Turkey)

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“…We believe the quick increase in temperature for zeolite type A and mordenite after 5 min is due to the higher iron content in these samples. The electrical conductivity of ferrous materials is generally high which causes higher microwave energy absorption with a quick increase in temperature (Tang et al 2007;Legras et al 2012;De Peña and Rondón 2013). The high percentage of iron in zeolite type A (0.8%) and mordenite (1.3%) compared to faujasite (Y) (0.06%), clinoptilolite (0.08%) and M-CLZ (0.03%) causes the quick increase in temperature for these samples.…”

Section: Adsorption/desorption Performancementioning

confidence: 99%

Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

Kalantarifard¹,

Gon²,

Yang³

2016

Terr. Atmos. Ocean. Sci.

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Granite, bentonite, and starch were mixed with clinoptilolite zeolite to produce a modified zeolite. The modified zeolite was tested for its ability to absorb formaldehyde from air. The modified sample formaldehyde adsorption capacity was then compared with those of commercially available clinoptilolite, faujasite (Y), mordenite, and zeolite type A. Studies were focused on the relationships between the physical characteristics of the selected zeolites (crystal structure, surface porosity, pore volume, pore size) and their formaldehyde adsorption capacity. The removal of starch at high temperature (1100°C) and addition of bentonite during modified clinoptilolite zeolite (M-CLZ) preparation generated large pores and a higher pore distribution on the sample surface, which resulted in higher adsorption capacity. The formaldehyde adsorption capacities of M-CLZ, clinoptilolite, faujasite (Y), zeolite type A, and mordenite were determined to be 300. 5, 194.5, 123.7, 106.7, and 70 mg per gram of zeolite, respectively. The M-CLZ, clinoptilolite, and faujasite (Y) crystals contained both mesoporous and microporous structures, which resulted in greater adsorption, while the zeolite type A crystal showed a layered structure and lower surface porosity, which was less advantageous for formaldehyde adsorption. Furthermore, zeolite regeneration using microwave heating was investigated focusing on formaldehyde removal by desorption from the zeolite samples. XRD, XRF, N 2 adsorption/desorption, and FE-SEM experiments were performed to characterize the surface structure and textural properties the zeolites selected in this study.

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Linde Type a Zeolite and Type Y Faujasite as a Solid-Phase for Lead, Cadmium, Nickel and Cobalt Preconcentration and Determination Using a Flow Injection System Coupled to Flame Atomic Absorption Spectrometry

Cited by 37 publications

References 35 publications

Zeolite Nanoparticles Loaded with 2-Methoxystradiol as a Novel Drug Delivery System for the Prostate Cancer Therapy

Zeolite Nanoparticles Loaded with 2-Methoxystradiol as a Novel Drug Delivery System for the Prostate Cancer Therapy

Local Wastes for Synthesis of Different Types of Zeolites

Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

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