Potential driven deposition of polyelectrolytes onto the surface of cysteine monolayers assembled on gold

Sanders, Wesley C.; Anderson, Mark R.

doi:10.1016/j.jcis.2009.10.033

Cited by 3 publications

(1 citation statement)

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“…51 Recent studies on functionalization of nanoparticles with cysteine have shown its interaction with different nanoparticles. 49,[52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] Gawande et al, have successfully functionalized ferrite nanoparticles with cysteine and studied their application in multi-component reactions. 67 In their study, cysteine functionalized ferrite nanoparticles are used as a catalyst for the synthesis of derivatives of b-amino carbonyl compounds and hydroquinoline; and these nanoparticles are found to be highly reusable even after 9 cycles of reactions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and antimicrobial property of Fe3O4-Cys-HNQ nanocomplex, with l-cysteine molecule as a linker

Sangeetha

Philip

2013

RSC Adv.

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Lawsone, (2-hydroxy-1,4-naphthoquinone or HNQ), is known for its antimicrobial activity, corrosion inhibition and metal chelation properties. We describe here a simple methodology to functionalize Fe 3 O 4 nanoparticles with lawsone to produce Fe 3 O 4 -Cysteine-HNQ nanocomplex, using cysteine as a linker. The characterization of the nanocomplex is done using Fourier Transform Infrared (FTIR) spectroscopy, Thermogravimetric Analysis (TGA), Dynamic Light Scattering size measurement, zeta potential and contact angle measurement. The zeta potential of uncoated nanoparticles and Fe 3 O 4 -Cysteine-HNQ nanocomplex is found to be +48 mV and 238 mV respectively. The reversal of surface charge from positive to negative corroborates the presence of lawsone monolayer at particle interface. Further, TGA result shows a weight loss of 32% for these nanocomplexes due to the decomposition of lawsone and cysteine present on the nanoparticles. The FTIR spectrum of the nanocomplex exhibits CLC and CLO stretching bands of lawsone, with a slight shift in their position, which confirms the interaction of lawsone with the cysteine coated nanoparticles. Fe 3 O 4 -Cysteine-HNQ nanocomplexes exhibit interesting properties such as increased wettability (contact angle y20u) on stainless steel substrate and antimicrobial activity against Staphylococcus aureus, with a minimum inhibitory concentration of 700 mg mL 21 . These results show that lawsone functionalized magnetite nanoparticles can be used as response stimulus antimicrobial agents.

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