Varun Arora

13 Questions 17 Answers 0 Followers

Questions related from Varun Arora

Negative slope in the curve of iron concentration and T2 relaxation?

I've done MRI imaging of iron oxide nanoparticles in phantom gels. The images are showing decreased signal intensities upon increasing the iron concentration, this is due to iron oxide being a...

16 December 2017 3,521 3 View

Help in analyzing Magnetic Resonance Imaging (MRI) data?

Hello, I have done MRI of iron oxide nanoparticles in phantom gels. Although I have got the signal intensities and related curves from the instrument (using Paravision software) and I have...

11 December 2017 5,580 2 View

Why does in FT-IR spectra of uncoated Iron oxide nanoparticles peaks at 2854 and 2926 cm-1 are coming?

I've seen FT-IR spectra of Iron oxide nanoparticles and in many of them peaks at 2854 and 2926 which corresponds to C-H stretching is coming, they haven't coated iron oxide with anything. Can...

08 April 2017 1,172 3 View

Protocol for conjugation of 7-amino 4-methylcoumarin to nanoparticles with free carboxyl groups on the surface?

I'm trying to conjugate 7-amino 4-methylcoumarin (AMC) to nanoparticles with free carboxylate groups on the surface via amide bond formation, but the problem is that AMC is not soluble in water...

14 March 2017 9,693 2 View

How to visualize the drug encpasulated inside the nanoparticles?

Is there any way to visualize a fluorescent drug loaded inside the nanoparticles? I think confocal microscopy won't help due to the small size of the nanoparticles and TEM won't be useful too.

06 March 2017 1,778 2 View

Is it possible to carry out dialysis in methanol?

I want to purify by sample by dialysis, is it possible to use 100% methanol or another other percentage ?

02 August 2016 9,107 7 View

How to convert tosylate into amine?

I am trying to synthesize Aminated PEG (NH2-PEG-OCH3) using P-amino benzoic acid to replace the tosyl group on peg-tosylate via nucleophillic substitution reaction. I think both amine and...

30 July 2016 3,273 7 View

Why curcumin is not being able to pass through dialysis membrane?

I'm trying to study release of curcumin from nanoparticles by using dialysis bags but the buffer solution outside the dialysis bag is colorless while inside there are particles and I did add...

07 May 2016 2,917 5 View

How to stir a solution at 280 °C?

I want to carry out a reaction at around 280 °C, the problem is stirring. PTFE magnetic beads have a temperature tolerance limit of 260 °C and pyrex coated magnetic beads have a tolerance limit of...

22 April 2016 389 1 View

EDC/NHS based coupling and stability?

I'm trying to conjugate carboxylic groups terminated nanoparticles with amine terminated polyethylene glycol, I'm using EDC/NHS for the conjugation and DMF as the solvent. The particles after...

29 March 2016 7,076 6 View

How do I calculate size by fitting M vs H curve by langevin function?

I am trying to calculate size by fitting M vs H curve using langevin function, I know the langevin equation, but my query is we plot a curve between M/Ms vs H or meu.H/K.T? After fitting the curve...

01 December 2015 7,885 3 View

Does anyone know about maximum tolerable concentration of magnesium?

Does anyone know about maximum tolerable and safe concentration of magnesium administered intravenously?

16 December 2014 1,247 4 View

Does anyone know about 1/Gm scale in SAED pattern?

I have done HRTEM imaging and Surface area electron diffraction (SAED) analysis of my nanoparticles, the results are fine, but the scale in SAED diffraction image is 10.0 1/Gm, not in nm. Does...

21 November 2014 9,208 6 View