Simultaneous analytical method [Bioanalytics]

posted by Helmut Homepage – Vienna, Austria, 2018-09-13 11:25 (806 d 05:16 ago) – Posting: # 19285
Views: 2,439

Hi giang nidqc,

» Could it be a possibility that the absence of one APIs may affect the final concentration of other APIs (regarding sample preparation and peak response)?

Sample preparation

Impossible. Regardless whether you use LLE or SPE each analyte follows the law of mass action (driven by pH, lipophilicity) independent from other analytes. The amount of the “target phase” (organic solvent, RP- or exchange resin) is 6 to 12 orders of magnitude higher than the one of the analyte. Hence, the presence / absence of other analyte(s) in a similar – low – amount is simply irrelevant. It can never change the equilibrium constant.

Chromatography

Unless you have an insufficient separation, no. Only if peaks overlap, in MS ion-suppression/enhancement by one analyte could influence the response of the other.

Ligand-binding assays

Can be problematic if you have a substantial degree of cross-reactivity.


Dif-tor heh smusma 🖖
Helmut Schütz
[image]

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

Complete thread:

Activity
 Admin contact
21,214 posts in 4,427 threads, 1,481 registered users;
online 12 (1 registered, 11 guests [including 10 identified bots]).
Forum time: Friday 15:41 CET (Europe/Vienna)

Biostatistician. One who has neither the intellect for mathematics
nor the commitment for medicine but likes to dabble in both.    Stephen Senn

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz
HTML5