Platelet activating factor has a short half-life because PAF acetylhydrolase (PAF-AH) degrades it very quickly. We analyze blood samples. Can you solve this problem?

Most substances can be relatively stable under freezing conditions, but it is recommended to use newly collected samples for testing to obtain more accurate results. There are three kinds of methods for PAF detection: ① biological detection method; ② Physicochemical method; ③ Immunological methods. ELISA assay recommends adding 1mM TPCK or TLCK to the plasma sample to inhibit the activity of PAF-AH.