Biocatalytic structural diversification of saponins in Zygophyllum decumbens: HR-LC-ESI-TOF-MS/MS profiling and bioactivity modulation. - Gabr NM; Abd-ElKhalik SM; Zaki JT; Abdel-Hafez LJM; El-Haddad AE (BMC complementary medicine and therapies, 2026)