Where can I buy the standards of quercetin and gallic acid for a thesis?

More Anyuri Fajardo's questions See All

Is there a way to determine the organization's effectiveness when leadership behaviors and professional development are interrelated?

Is there a way to determine the organization's effectiveness when leadership behaviors and professional development are interrelated?Which among the leadership behaviors, and professional...

19 February 2024 7,802 3 View

Can leadership behavior and professional development affects in school performance? in what way?

I am conducting a dissertation about leadership.

24 January 2024 9,995 3 View

Are Enzymes produced from genetically modified microorganisms authorised in Europe?

Dear colleagues, I am writing to inquire if anyone could help me to clarify these question. After revising different updated databases and european regulation, I have clear that nowadays there are...

09 February 2023 5,933 0 View

¿How to choose t-statistic threshold for Network Based Statistic?

Hi everyone: I am running NBS ( Network-based statistic: Identifying differences in brain networks ) to compare 21x21 FC matrices between two groups. My concern is that component and...

10 May 2020 6,366 0 View

What kind of molecules could degradate during a NMR experiment using CDCl3 as solvent?

I was having the issue that a series of compounds degradate by the mild acidity of chloroform when we perform NMR experiments. I think that these compounds could be terpenoids (dollabellane type)....

13 February 2020 9,366 3 View

¿Califica cuál es la importancia que las empresas le dan a la calidad de sus productos y servicios?

Desde tu experiencia califica ¿Cuál es la importancia que las empresas de tu ciudad le dan a la calidad de sus productos y servicios? Siendo 1 Nula y 5 Mucha.

21 February 2019 1,370 1 View

Bacteriocins in food industry ?

I would like to confirm which bacteriocins are authorised in UE for foods uses by EFSA ? Nisin (E-234) and Pediocin PA-1, anymore ? Uses? Thank you

23 September 2018 1,626 7 View

Which are the most relevant current challenges in the Solid Waste Management in developing countries? Which are your arguments or evidences?

Which are the most relevant current challenges in the Solid Waste Management in developing countries? Which are your arguments or evidences? Several organizations and experts have designed and...

02 May 2018 5,124 15 View

FAME CG analysis (derivation) ?

I would like to know why appear in my chromatograms this high derivation (solvents, samples, etc.) Program used is 140 º C 2 min , 6ºC/min to 230ºC (final 7 min). Thanks in advance

29 October 2017 9,622 3 View

Has anyone used a Fluorimeter (Jenway) to assess NaFl??

I'm currently using a Jenway Fluorimeter to assess the variations in BBB permeability. But there are certain things that i can't configurate right, (and the manual has not been very helpful). For...

01 October 2017 782 0 View

What is the solvent for 8YSZ nano material?

I need to do some experiment with it in liquid form.

07 August 2024 613 3 View

Separation of organic acids-HPLC?

Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.

07 August 2024 8,782 3 View

What is the prepared reference material that can be used in inductively coupled plasma optical emission spectrometry (ICP-OES) to measure REE and U ?

What is the prepared reference material that can be used in the ICPE-9820 Shimadzu Japan instrument, which employs inductively coupled plasma optical emission spectrometry (ICP-OES) to measure...

06 August 2024 1,896 1 View

The aqueous fraction of the hydroethanolic extract is showing the presence of palmitic acid. What is the mechanism responsible ?

Palmitic acid presence in aqueous fraction

05 August 2024 8,624 4 View

Which solvent is better to dissolve with secondary metabolites extracted from fungi?

I work on MCF7 cell cell for anticaner purpose and I wa to do drug preperation the drug ( secondary metabolites extracted from Aspergillus) My question which solvent is better with these secodary...

03 August 2024 4,725 2 View

How to convert g/kg Humic acid dose to kg/ha?

I used humic acid at 0.044 g/kg soil in my pot experiment. But finally, I have to recommend kg/ha. Each pot's soil weight was 11 kg. What is the solution?

02 August 2024 7,186 6 View

I need to dissolve stigmasterol for an animal experiment, it hasn't dissolved in either DMSO or vegetable oil. Can anyone recommend the best solvent?

Hello everyone, I need to dissolve stigmasterol for an animal experiment, but it hasn't dissolved in either DMSO or vegetable oil. Can anyone recommend the best solvent for stigmasterol?

01 August 2024 7,504 2 View

Inquiry on Maximum Nucleic Acid Volume for 2.5 mL Liposome Solution?

I am currently working on a project involving liposomes and need to determine the maximum volume of siRNA that can be added to a 2.5 mL liposome solution with a total lipid concentration of 10...

30 July 2024 6,420 1 View

Why is trifluoroacetic acid (TFA) used in c-18 column?

I would like to know the role of the TFA (trifluoroacetic acid) used on reverse phase chromatography c-18 column. It's is often used with a concentration of 0.1% on the mobile phase.

23 July 2024 8,075 3 View

Why methanol and sulphuric acid used in the analysis of polyhydroxyalkanoates (PHA) by GC-MS?

Why methanol and sulphuric acid, used in the analysis of polyhydroxyalkanoates (PHA) methyl esters by GC-MS? Additionally, why do we typically use non-polar solvents in GC-MS?

22 July 2024 1,210 2 View

Chithan C Kandaswami

Anyuri:

You can procure these sustances from Sigma.

April Han

Hi, Anyuri. I know there is a company who has the standards can meet your requirments, please let me know if you are interested in that.

Chen Jingwen

Hi,

You can buy them at Alfa Chemistry. The links are below:

http://www.alfa-chemistry.com/search.aspx?q=quercetin

http://www.alfa-chemistry.com/search.aspx?q=gallic%20acid