Do you really know about SPE normal phase and reverse phase extraction?

Solid-phase extraction (SPE for short), also known as solid-phase extraction, is a pretreatment technology based on liquid-solid chromatography separation, which can selectively adsorb and selectively elute target compounds. According to its retention mechanism, the force is mainly divided into non-polar interaction, polar interaction, ion exchange (electrostatic attraction). Ion exchange cartridges Read more…

Detection of 7 sex hormones such as estriol in cosmetics

Sex hormones refer to steroid hormones synthesized by tissues such as the gonads, placenta, and adrenal cortex of animals, including estriol, estrone, diethylstilbestrol, estradiol, testosterone, methyl testosterone, and progesterone. Sex hormones have the physiological function of controlling the attached sex organs and secondary sexual characteristics. Adding them to cosmetics can Read more…