Goldenberry (Physalis peruviana L.) seed oil: press extraction, optimization, characterization, and oxidative stability

In order to optimize the screw-press extraction conditions of oil from goldenberry (Physalis peruviana L.) seeds obtained nectar processing waste, a face centered design was applied. The extracted at different temperatures (60, 80, and 100°C) seed moisture contents (8, 10, 12%). Oil recovery (OR) increased residual in cake decreased significantly as content temperature were reduced; volatile matter well acid value, K232, K268, p-anisidine, respectively, proportionally with extraction. Thus, highest OR (86.4%) best quality 8% 60°C pressing temperature. Under these conditions, presented high linoleic (76.0%), iodine value (140.0 mg I2/g), refractive index (1.4769). stability index, measured by Rancimat, varied 3.65 h (120°C) 14.87 (100°C); predicted shelf life 25°C 120.4 days activation energy 85.6 kJ/mol. results highlighted that screw-pressing provides without employing polluting hazardous solvents.