Hydroxyphenyl Fluorescein (HPF) is a cell-permeable fluorescent dye for the detection of highly reactive oxygen species with little or no intrinsic fluorescence.Hydroxyphenyl Fluorescein can be used in fluorescent enzyme labeling and flow cytometry, and can be used to Neurodegeneration and aging. Fluorescence wavelength: Ex/Em = 490/515 nm.

Operation steps:
a. Preparation of stock solution: Prepare 10 mM HPF with DMSO; (it is recommended to store at -20 ℃ or -80 ℃ in the dark after aliquoting)
b. Preparation of HPF working solution
Dilute the stock solution and dissolve it in serum-free cell culture medium or PBS to prepare 1-10 μM HPF working solution; (select the appropriate working solution concentration according to experimental requirements and prepare it for immediate use)
c. Cell staining
1. Suspended cells (6-well plate)
a. Centrifuge at 1000 g for 3-5 minutes at 4℃, and then discard the supernatant. Wash twice with PBS for 5 minutes each. The cell density is 1×106/mL;
b. Add 1 mL of working solution and incubate at room temperature for 15 minutes;
c. Centrifuge at 4℃ and 400 g for 3-4 minutes, and discard the supernatant;
d. Wash twice with PBS, 5 minutes each time;
e. Resuspend cells with serum-free cell culture medium or PBS. Observe with fluorescence microscope or flow cytometer.
2. Adherent cells
a. Culture adherent cells on sterile coverslips;
b. Remove coverslips from culture medium and aspirate excess culture medium;
c. Add 100 μL working solution, shake gently to completely cover cells, and incubate at room temperature for 15 minutes;
d. Wash twice with culture medium, 5 minutes each time. Observe with fluorescence microscope or flow cytometer.