Adsorption characteristics of cadmium and lead heavy metals into locally synthesized Chitosan Biopolymer

Unagolla, JM; Adikary, SU

doi:10.4038/tar.v26i2.8102

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…Moreover this pH is favorable for the adsorption of metal ions in CS [30][31][32][33]. However, in highly acidic solutions the adsorption capacity of CS for cations is lowered because the higher H + ion concentration reduces the number of binding sites for metallic ions [34]. Moreover, the Cu(II) ion is connected with the amine and OH groups of CS forming a bridge via coordinate covalent bond that is strong enough to maintain the complex structure [30].…”

Section: Epd Process Of Cu(ii)-csmentioning

confidence: 99%

Electrophoretic Deposition of Copper(II)–Chitosan Complexes for Antibacterial Coatings

Akhtar

Ilyas

Dlouhý

et al. 2020

IJMS

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Bacterial infection associated with medical implants is a major threat to healthcare. This work reports the fabrication of Copper(II)–Chitosan (Cu(II)–CS) complex coatings deposited by electrophoretic deposition (EPD) as potential antibacterial candidate to combat microorganisms to reduce implant related infections. The successful deposition of Cu(II)–CS complex coatings on stainless steel was confirmed by physicochemical characterizations. Morphological and elemental analyses by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) spectroscopy verified the uniform distribution of copper in the Chitosan (CS) matrix. Moreover, homogeneous coatings without precipitation of metallic copper were confirmed by X-ray diffraction (XRD) spectroscopy and SEM micrographs. Controlled swelling behavior depicted the chelation of copper with polysaccharide chains that is key to the stability of Cu(II)–CS coatings. All investigated systems exhibited stable degradation rate in phosphate buffered saline (PBS)–lysozyme solution within seven days of incubation. The coatings presented higher mechanical properties with the increase in Cu(II) concentration. The crack-free coatings showed mildly hydrophobic behavior. Antibacterial assays were performed using both Gram-positive and Gram-negative bacteria. Outstanding antibacterial properties of the coatings were confirmed. After 24 h of incubation, cell studies of coatings confirms that up to a certain threshold concentration of Cu(II) were not cytotoxic to human osteoblast-like cells. Overall, our results show that uniform and homogeneous Cu(II)–CS coatings with good antibacterial and enhanced mechanical stability could be successfully deposited by EPD. Such antibiotic-free antibacterial coatings are potential candidates for biomedical implants.

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Section: Epd Process Of Cu(ii)-csmentioning

confidence: 99%

Electrophoretic Deposition of Copper(II)–Chitosan Complexes for Antibacterial Coatings

Akhtar

Ilyas

Dlouhý

et al. 2020

IJMS

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show abstract

“…It should be emphasized that the pH of the suspensions before EPD was intended to be 4.5, in order to facilitate the solubility of CS and to increase its metal-binding ability. On the one hand, in highly acidic solutions the adsorption capacity of CS for cations is lowered because H + ions compete with metals to bind to the polymer active sites [47,48]. Additionally, the protonation of amino groups in acidic environments induces the electrostatic repulsion of metal cations, which also limits the chelation performance [47].…”

Section: Influence Of Ga (Iii) Concentration On Suspension Propertiesmentioning

confidence: 99%

“…On the one hand, in highly acidic solutions the adsorption capacity of CS for cations is lowered because H + ions compete with metals to bind to the polymer active sites [47,48]. Additionally, the protonation of amino groups in acidic environments induces the electrostatic repulsion of metal cations, which also limits the chelation performance [47]. On the other hand, at neutral to basic pH, the amine groups in the glucosamine monomer unit of the polysaccharide structure deprotonate.…”

Section: Influence Of Ga (Iii) Concentration On Suspension Propertiesmentioning

confidence: 99%

Electrophoretic Deposition and Characterization of Functional Coatings Based on an Antibacterial Gallium (III)-Chitosan Complex

et al. 2020

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Despite their broad biomedical applications in orthopedics and dentistry, metallic implants are still associated with failures due to their lack of surface biofunctionality, leading to prosthesis-related microbial infections. In order to address this issue, the current study focuses on the fabrication and characterization of a novel type of antibacterial coating based on gallium (III)-chitosan (Ga (III)-CS) complex layers deposited on metallic substrates via electrophoretic deposition (EPD). Aiming for the production of homogeneous and monophasic coatings, a two step-procedure was applied: the first step involved the synthesis of the Ga (III)-CS complex, followed by EPD from suitable solutions in an acetic acid–aqueous solvent. The influence of Ga (III) concentration on the stability of the suspensions was evaluated in terms of zeta potential. Fourier transform infrared (FTIR) and energy dispersive X-ray (EDX) spectroscopic analyses indicated the chelation of CS with Ga (III) within the coatings, while scanning electron microscopy (SEM) confirmed that no additional metallic gallium deposited during EPD. Furthermore, the results demonstrated that the wettability, mechanical properties, swelling ability, and enzymatic degradation of the coatings were affected by the quantity of Ga (III) ions. Colony forming unit (CFU) tests showed a strong synergistic effect between CS and Ga (III) in inhibiting Escherichia coli strain growth compared to control CS samples. An in vitro study with MG-63 cells showed that Ga (III)-containing coatings were not toxic after 24 h of incubation.

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“…Sementara untuk waktu respon sensor A sebesar 22 s, sensor B 42,5 s dan sensor C 86 s. Kata kunci: Sensor serat optik, Kitosan, Merkuri, Sensitivitas PENDAHULUAN Keberadaan ion logam berat merupakan ancaman yang cukup serius bagi kesehatan manusia dan lingkungan [1]. Hal ini dikarenakan sifat ion logam berat yang beracun cenderung mengalami bioakumulasi dan tidak mudah terurai dalam tubuh manusia [2]. Ion logam berat yang paling banyak ditemukan adalah kadmium, timbal dan merkuri.…”

Section: Abstrakunclassified

Fabrikasi Sensor Serat Optik Plastik Untuk Deteksi Ion Logam Merkuri Dalam Air

Vaeruza

Kurniansyah

Darma

et al. 2019

KFI

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The presence of mercury ions is a serious threat to human health and environment. Water consumption containing mercury is very dangerous for human healt. The purpose of this work is to design a heavy metal sensor ion using plastic optical fiber to detect mercury ions in water. The sensor was fabricated by coating the optical fiber by chitosan through dip-coating technique. There are three diameter of optical fiber sensor that was fabricated, which are 1087.64 μm (sensor A), 1691.64 μm (sensor B) and 1736.33 μm (sensor C). Sensor characterization was done by connected the tip of plastic optical fiber to an LED and the other tip was connected to a photodioda. The results show that sensitivity of sample A is 0.32 mA/ppm, sample B is 0.56 mA/ppm and sample C is 0.64 mA/ppm. In terms of respone time, it is shown that thr respon time for sensor A, B and C are 22 s, 42.5 s and 86 s respectively.

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Adsorption characteristics of cadmium and lead heavy metals into locally synthesized Chitosan Biopolymer

Cited by 17 publications

References 6 publications

Electrophoretic Deposition of Copper(II)–Chitosan Complexes for Antibacterial Coatings

Electrophoretic Deposition of Copper(II)–Chitosan Complexes for Antibacterial Coatings

Electrophoretic Deposition and Characterization of Functional Coatings Based on an Antibacterial Gallium (III)-Chitosan Complex

Fabrikasi Sensor Serat Optik Plastik Untuk Deteksi Ion Logam Merkuri Dalam Air

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