An ultra performance liquid chromatographic method for determining phytosterol uptake by Caco-2 cells

Area of Science:

• Biochemistry
• Analytical Chemistry
• Cell Biology

Background:

• Phytosterols are plant-derived compounds with cholesterol-lowering properties.
• Understanding cellular uptake mechanisms is crucial for assessing phytosterol bioavailability.
• Caco-2 cells serve as a widely used in vitro model for intestinal absorption studies.

Purpose of the Study:

• To develop and validate a simple, sensitive method for quantifying cellular phytosterol uptake.
• To analyze the uptake of key dietary phytosterols (β-sitosterol, campesterol, stigmasterol, brassicasterol) in Caco-2 cells.
• To establish a reliable analytical tool for in vitro intestinal models.

Main Methods:

• Ultra performance liquid chromatography with ultraviolet detection (UPLC-UV) was optimized using an ODS column and a specific mobile phase.
• Four abundant dietary phytosterols were selected as target analytes.
• Method validation included linearity, precision (RSD), and recovery assessments using Caco-2 cell lysates.

Main Results:

• The UPLC-UV method demonstrated excellent linearity (r>0.999) and precision (RSD < 2.5%) for phytosterol quantification.
• Extraction recovery of phytosterols from cell lysates exceeded 80.2% with an RSD < 11.3%.
• Phytosterol uptake by Caco-2 cells increased with incubation time and concentration.

Conclusions:

• A robust UPLC-UV method for simultaneous determination of cellular phytosterols in Caco-2 cells was successfully developed.
• The method provides a valuable tool for investigating phytosterol absorption and transport in intestinal models.
• This research contributes to understanding the bioavailability of dietary phytosterols.