Do you know a method to quantify citric acid, folic acid, sodium bicarbonate and leonardite?

More Stefano Salvatori's questions See All

SAcetic acid analysis in liquid wastes?

Hy, can you suggest a method to quantify acetic acid in aqueous bye GC-FID? Thsnks in advance

03 April 2018 5,831 0 View

How can i quantify isocyanate in ambient air after sampling with glass tubes containing an inert support ?

Hy, i'd like to quantify isocyanate in ambient air with HPLC /UV, as suggested in NIOSH method 5551, after extraction from sampling tube containing an inert support impregnated with...

07 August 2016 9,258 1 View

Sulfur trioxide pyridine complex determination?

Good morning, can you suggest a method for Sulfur trioxide pyridine complex determination? Thanks in advance Stefano

05 June 2016 1,089 2 View

Organic selenium extraction?

May you suggest a method to quantify organic selenium in food? I thought to express it, as the difference between total selenium and inorganic (water soluble forms), but i'm not sure to extract...

02 March 2016 8,337 5 View

Can I use gravimetric method for fiber determination in food?

Hi, may you suggest a rapid method to quantify fiber in food without enzimatic steps? May i use the percentage of fat, ash, moisture and carbohydrate to quantify them? Thanks in advance Stefano

02 March 2016 4,746 4 View

Hyaluronic acid from wheat ?

May you suggest a method to produce hyaluronic acid from wheat on pilot scale? Thanks in advance Stefano Salvatori

02 March 2016 6,573 3 View

Do you know sellers of adam site?

Hy may you suggest any sellers for adamsite (CAS #: 578-94-9) and protocol analysis in soil and water matrix? Thanks in advance Stefano

04 May 2015 6,016 0 View

Correct HPLC column?

May you suggest a reference about the correct choice of column and stationary phase in HPLC? Thanks in advance Stefano Salvatori

02 March 2015 6,291 4 View

How can I quantify macroelements in leaves?

I need to quantify phosphorous in leaves; usually to quantify other elements (like Ca, Na) we turn to ashes the leaves and analyze the acidic solution by ICP-OES or ICP-MS, but i've the suspect...

02 March 2015 10,018 14 View

Are you familiar with an Inulin determination method?

Do you know a method to quantify Inulin in food? Thanks in advance. Stefano.

01 February 2015 8,369 3 View

Baseline drift in HPLC? What causes this?

Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!

11 August 2024 3,770 4 View

How to define an anisotropic material with asymmetric elastic compliance/stiffness matrix in ANSYS APDL?

I need to model an anisotropic material in which the Poisson's ratio ν_12 ≠ ν_21 and so on. Therefore, the elastic compliance matrix wouldn't be a symmetric one. In ANSYS APDL, for TB,ANEL...

09 August 2024 5,048 2 View

Is it true that $\det(V(A))$ may be only $\pm 1$, depending on $n$, for the last symmetric tridiagonal matrix $A$?

One can try to generalize the Vandermonde determinant in the following direction: Let $A$ be any symmetric $n$-order square matrix. Consider its powers' diagonal elements $(A^k)_{ii}$ and...

08 August 2024 6,690 1 View

How to calculate CCS for Sodiated adduct ions and Multiply Charged Ions?

I'm currently working on calculating the collision cross section (CCS) for various ions, and I'm facing challenges when dealing with sodiated and multiply charged ions. Most of the resources I’ve...

08 August 2024 8,329 0 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

Weak DAPI staining after immunohistochemistry - how to improve?

After immunohistochemistry of previously fixed in PFA and EtOH and then frozen 20 μm sections of zebrafish brain, DAPI staining is very weak (right) compared to the same sections stained without...

05 August 2024 9,637 2 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

Usage of internal standards in LC-MS/MS analysis?

Have you ever seen a LC-MS/MS method uses both internal standards and external standards (in matrix matching purpose) but the concentrations of internal standards are outside the calibration curve...

05 August 2024 3,084 6 View

How to isolate lymphocytes from mouse spleen?

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Request a single Lecture notes for math as detailed as this that I can find in one place?

- The Existence/Uniqueness of Solutions to Higher Order Linear Differential Equations - Higher Order Homogenous Differential Equations - Wronskian Determinants of $n$ Functions - Wronskian...

03 August 2024 2,366 0 View

Mohamed A Elbagerma

please check the likes below and attached file and i hope to be useful to you

http://www.chem.agilent.com/Library/applications/5990-8720EN.pdf

http://www.academia.edu/5894089/Validation_of_UV-HPLC_method_for_simultaneous_quantification_of_organic_acids_in_disinfectants_for_haemodialysis_machines

Stefano Salvatori

Thanks very much!

Nakamichi Watanabe

I me sure the citric acid using by spectrophotometer. I attach my manuscript. If this method is ok, please use this method.