Microbial toxicity of ethanolamines—Multiwalled carbon nanotubes

Abstract

In the present study, antimicrobial activities of multiwalled carbon nanotubes (MWCNTs) functionalized with ethanolamine (EA) groups were investigated. Therefore, MWCNT were first functionalized with mono-, di-, and triethanolamine (MEA, DEA, and TEA) under microwave technique. Development of functional groups on the MWCNT surface was confirmed by Fourier transform infrared and thermogravimetric analysis. Morphological variation was investigated by transmission electron microscopy. Then, antimicrobial activities of pristine and functionalized MWCNT (MWCNT-MEA, -DEA, and -TEA) were tested against different bacteria species. The studies have been done on four Gram-negative bacteria (Escherichia coli, Klebsiella pneumonia, Pseudomonas aeroginosa, and Salmonella typhimurium) as well as four Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus, Bacillus cereus, and Streptococcus pneumonia). The results based on minimal inhibitory concentration and radial diffusion assay were shown that the antimicrobial activity of MWCNT-TEA > MWCNT-DEA > MWCNT-MEA > pristine MWCNT. Based on the results, it seems that EA groups could play an important role in antimicrobial activity of MWCNT.

Synthesis of ethylene glycol-treated Graphene Nanoplatelets with one-pot, microwave-assisted functionalization for use as a high performance engine coolant

“…2B is shown the Raman spectra of the pristine and EG-treated GNP, which illustrates the amorphous/disorder (D mode) and tangential (G mode) bonds at 1346 and 1573 cm À1 . The D band is commonly attributed to the amorphous (sp 3 ) carbon, is due to disruption of aromatic p-electrons, and G band is related to the graphitic carbon (sp 2 ) [39,40]. It can be seen that the intensity ratios of the D-G band (I D /I G ) is larger than that of pristine sample, indicating some sp 2 hybridized carbons changed to the sp 3 hybridization.…”

“…A couple of peaks at the ranges of 2850-3000 cm À1 and a peak at 1403 cm À1 are consistent, respectively, to the stretching and in-plane bending vibrations of the CAH bond. Based on the results of FTIR, the alkyl and hydroxyl groups are successfully attached to the GNP material through an electrophilic addition reaction under microwave irradiation [36][37][38][39][40].…”

Synthesis and application of diethanolamine-functionalized polystyrene as a new sorbent for the removal of p-toluenesulfonic acid from aqueous solution

“…The bands at 1630, 1104 and 1044 cm À1 are well linked to N-H bending, n C-N and n C-O, respectively [22,23]. The peaks at 2922, 1507 and 1460 cm À1 are also assigned to stretching vibrations of C-H, C5 5C and asymmetric vibration of -CH 2 bonds in the polymeric backbone, respectively [22][23][24]. The spectrum of Cl-PS shows a peak at 813 cm À1 assigned to stretching vibration of C-Cl [25].…”

Antibacterial Compound Identification of Cayenne Pepper Leaf Extract (Capsicum frutescens L.) against Klebsiella pneumoniae and Cell Leakage Mechanism

“…Aktivitas antibakteri suatu senyawa etanolamin akan meningkat dengan penambahan jumlah gugus amina. Interaksi gugus tersebut dengan dinding sel bakteri dapat menyebabkan berkurangnya selektifitas permeabilitas yang dapat mengakibatkan terjadinya kebocoran substansi intraseluler seperti protein, asam amino dan dehidrogenase glukosa dan substansisubstansi lain, sehingga menghambat metabolisme mikroorganisme dan akhirnya menyebabkan kematian sel (Zardini et al, 2014).…”