SIVALA KUMARHARISH, N2018-06-292018-06-292016http://krishikosh.egranth.ac.in/handle/1/5810055661D5352The present work was undertaken to optimize the process parameters for prepress solvent extraction of corn oil. The effects of preheating temperatures (90, 120, 150 and 180 °C) & time durations (2, 4, 6 and 8 min) on the oil yield and quality parameters of oil (saponification value, acid value, iodine value & peroxide value) obtained by mechanical pressing were studied. Similarly the effects of extraction temperatures (70, 80, 90 and 100 °C) & time durations (20, 40, 60 and 80 min) on the oil yield, quality parameters of oil and quality parameters of deoiled cake (crude protein, crude fibre & ash contents) obtained by solvent extraction of pressed cake at optimized condition were studied. Response Surface Methodology (RSM) was used to investigate the optimum process conditions for prepress solvent extraction of oils and to analyze the effects of processing variables, including preheating temperatures and time durations for pressing and extraction temperatures and time durations for solvent extraction. Response surface plots of dependent variables against process variables were studied. The different regression equations describing the process variables on the yield and quality parameters ix were developed. The predicted models were adequate based on the coefficient of determination obtained. In mechanical pressing process, the dependent variables such as oil yield, acid value and peroxide value increased with increased preheat conditions while saponification & iodine values were decreased. It was observed for pressing at the optimized condition of temperature 110 °C and time 8 min gave oil yield, saponification value, acid value, iodine value and peroxide value were found to be 42.04%, 217.40 mgKOH/g, 1.49 mgKOH/g, 100 g Iodine/100 g and 1.12 meq/kg, respectively. In solvent extraction process, the dependent variables of oil & deoiled cake such as yield, acid value, crude protein & crude fibre contents increased with increased process parameters while saponification, iodine, peroxide & ash content values were decreased. It was observed for solvent extraction at the optimized condition of temperature 82 °C, and 80 min gave oil yield, saponification value, acid value, iodine value, peroxide value, crude protein, crude fibre and ash content were found to be 12.37%, 219.22 mgKOH/g, 1.80 mgKOH/g, 119.40 g Iodine/100 g, 1.72 meq/kg, 25.20%, 15.25% and 6.05%, respectively. During the process of prepress solvent extraction of oil, the oil yield was 42.04% in pressing of maize germs and 12.37% in solvent extraction of pressed cake resulted total oil yield of 54.01% out of total oil content of 56.50%. Keywords: corn germ, heating temperature, yield, oil quality, deoiled cake, response surface methodology, optimization.en-USnullThesis