Can any one help me with an hplc UV method for determination of D-Sorbitol?

I am looking for a method to determine D-Sorbitol using hplc UV detector.any one can help

04 May 2018 8,947 7 View

What cause the sample and standard Peak to have a negative absorbance?

I have a problem in hplc analysis of L-cystine analysis that the peak of both sample and standard have negative absorbance. This the first trial . -UV detector at 500nm. -Mobile phase phosphate...

11 December 2017 8,007 2 View

In dissolution test for tablets, What kind of filters used to filter samples contain indigo carmine aluminum lake (E132) as colorant?

In dissolution test for Abilify 5mg (aripiprazole) Results show high results about 110%, while maximum result should not exceed 104%(max. result in content uniformity test). This problem does not...

07 August 2017 7,455 2 View

What is meant by HPLC grade water?

31 December 2016 2,598 4 View

What does it mean by about if it said in a monograph that the retention time is about 20?

In a monograph ,it said that the retention time of the peak is about 20.

10 November 2016 2,377 6 View

What cause shifting of retention time of a peak forward?

1- I have problem in shifting of retention time of a peak : During analysis of rebamipide, the peak of rebamipide shift forward. for example(Std at 20.0 and sample at 20.5), and as the sample set...

10 November 2016 1,350 10 View

Why does the peak of one substance disappear when injecting a mix of two, but when I inject each substance alone separately, they both give peaks ?

11 December 2014 9,859 13 View

How can I determine the shelf life (expiry date) of prepared volumetric solutions?

When I prepare a volumetric standard solution, I want to determine its expiry date by taking in consideration that it is not mentioned in any reference. And if possible I need a protocol for it.

03 April 2014 6,649 4 View

How to restore my column performance?

31 December 2013 9,085 1 View

What is the official method for analysis of free amino acids by HPLC(WATERS)?

I need to know if this method is the official for analysis or not?

09 October 2013 6,819 5 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Looking for Materials with high thermal expansion coefficient and high temperature resistance?

03 March 2021 8,272 1 View