Why is starch maleate pale yellow in color?

I need to esterify starch with maleic anhydride. The resultant product is pale yellow in colored.

09 October 2017 9,329 2 View

Can DMSO in sample injections of 10 micro-litre volume harm a C-18,(200*4.6mm),Silica HPLC Column?

I have been trying to analyze 5-Hydroxymethylfurfural from starch.For this,I have to use DMSO to get good product selectivity,a halide catalyst and an ionic-liquid[EMIMCl/BMIMCl] to make the...

07 August 2015 9,066 10 View

How can I separate most of the DMSO from water-ionic liquid mixture by fractional crystallization?

I am using DMSO,water-IL and solid catalyst to synthesize HMF and managed to extract most of it from reaction media with diethyl ether.Following this,I am left with the spent catalyst+ionic liquid...

07 August 2015 8,500 6 View

How should I proceed to dissolve starch in water?

To dissolve starch in DMSO is a viable option but I don't know the approach and the associated physico-chemical changes that may happen in the starch.

03 April 2015 2,358 7 View

What is involved in morphological changes of SEM images of a substance?

In the sem analysis of CaCO3 nanaoparticles, the morphology images showed spherical shaped particles but the proposed morphology for these type of nanoparticles is trigonal. I prepared the...

01 March 2021 1,960 4 View

Heat exchanger with liquid Nitrogen as coolant?

I want to cool Natural Gas from 195 Kelvin to 138 Klevin in a heat exchanger by using liquid nitrogen as the coolant medium. When entering the heat exchanger, the liquid nitrogen will have a...

01 March 2021 6,450 5 View

Which polarizers are usually used to measure the birefringence of zebrafish muscles?

I already found several publications on that topic, however, the specifications for the used filters are often missing. Some more specific information than "fish is placed between to polarizing...

23 February 2021 1,934 1 View

How to get/count refractive index in gasses?

20 February 2021 8,202 6 View

How to calculate the Atomic Polar Tensor using DFT ?

Dear friends, I am a beginner at DFT calculation. I have done a structure optimization using DFT- B3LYP/6-31G*, Nevertheless, I don't know How to calculate the Atomic Polar Tensor (APT) in...

17 February 2021 9,082 3 View

How to make Fast Green FCF from powder?

Hi everyone We need Fast Green to electroporate plasmid into mice embryos, therefore we simply need it to see some color in the liquid we are electroporating so that electroporation is more...

07 February 2021 1,671 2 View

Which is the best software for the simulation of tribological properties of materials?

I want to simulate the tribological properties of solids, liquids, and fluids, please suggest good software.

02 February 2021 3,947 3 View

How can solve/disperse silicon nanoparticles in water?

I want to add silicon nanoparticles to my hydrogel, but when I sonicated these particles with water to disperse them in water, they agglomerated on the water's surface. How can I disperse them in...

26 January 2021 213 4 View

Should I make 2 helical antennas? One for 2.4 GHz and another for 5.8 GHz?

Should I make 2 antennas, one for 2.4 GHz and one for 5.8 GHz? How should I approach the problem if I want to design the antennas which cover 400 and 900 MHz and 2.4 and 5.8 GHz? All together in...

26 January 2021 906 3 View

Does anybody work with CoolLED in fluorescence microscopy?

I have trouble with exciting wavelengths higher than 460 nm while e.g. ex with 405 nm works. Filtercubes are correc, as I used them with my old xenon lamp before... I work on axiovert200M and with...

25 January 2021 5,201 2 View