Ultra high pressure homogenization (UHPH) is a useful novel technology to obtain safe and high-quality
liquid foods. The effect of UHPH at 200 and 300 MPa in combination with different inlet temperatures
(Tin) (55, 65 and 75 C) on the bioactive compounds of soya milk was studied. Total phytosterols
increased with the higher combination of pressure and temperature. The main phytosterol was b-sitosterol,
followed by stigmasterol and campesterol. Total tocopherols in UHPH-treated soya milks decreased
as the temperature and pressure increased. UHPH treatment also affected the different chemical forms of
tocopherols. No biogenic amines were detected in any of the analyzed soya milks. Meanwhile, the polyamines
SPD and SPM were found in all soya milks, being stable to the UHPH treatment. Total isoflavones
increased with the higher combination of pressure and temperature. No differences in the isoflavone profile
were found, with b-glucoside conjugates being the predominant form.